微軟 SqlServer數據訪問幫助類

微軟 SqlServer數據訪問幫助類  

 /// <summary>  
    /// SqlServer數據訪問幫助類  
    /// </summary>  
    public sealed class SqlDbHelper
    {
        #region 私有構造函數和方法  

        private SqlDbHelper() { }

        /// <summary>   
        /// 將SqlParameter參數數組(參數值)分配給SqlCommand命令.   
        /// 這個方法將給任何一個參數分配DBNull.Value;   
        /// 該操作將阻止默認值的使用.   
        /// </summary>   
        /// <param name="command">命令名</param>   
        /// <param name="commandParameters">SqlParameters數組</param>   
        private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)
        {
            if (command == null) throw new ArgumentNullException("command");
            if (commandParameters != null)
            {
                foreach (SqlParameter p in commandParameters)
                {
                    if (p != null)
                    {
                        // 檢查未分配值的輸出參數,將其分配以DBNull.Value.   
                        if ((p.Direction == ParameterDirection.InputOutput || p.Direction == ParameterDirection.Input) &&
                            (p.Value == null))
                        {
                            p.Value = DBNull.Value;
                        }
                        command.Parameters.Add(p);
                    }
                }
            }
        }

        /// <summary>   
        /// 將DataRow類型的列值分配到SqlParameter參數數組.   
        /// </summary>   
        /// <param name="commandParameters">要分配值的SqlParameter參數數組</param>   
        /// <param name="dataRow">將要分配給存儲過程參數的DataRow</param>   
        private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow)
        {
            if ((commandParameters == null) || (dataRow == null))
            {
                return;
            }

            int i = 0;
            // 設置參數值   
            foreach (SqlParameter commandParameter in commandParameters)
            {
                // 創建參數名稱,如果不存在,只拋出一個異常.   
                if (commandParameter.ParameterName == null ||
                    commandParameter.ParameterName.Length <= 1)
                    throw new Exception(
                        string.Format("請提供參數{0}一個有效的名稱{1}.", i, commandParameter.ParameterName));
                // 從dataRow的表中獲取爲參數數組中數組名稱的列的索引.   
                // 如果存在和參數名稱相同的列,則將列值賦給當前名稱的參數.   
                if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)
                    commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];
                i++;
            }
        }

        /// <summary>   
        /// 將一個對象數組分配給SqlParameter參數數組.   
        /// </summary>   
        /// <param name="commandParameters">要分配值的SqlParameter參數數組</param>   
        /// <param name="parameterValues">將要分配給存儲過程參數的對象數組</param>   
        private static void AssignParameterValues(SqlParameter[] commandParameters, object[] parameterValues)
        {
            if ((commandParameters == null) || (parameterValues == null))
            {
                return;
            }

            // 確保對象數組個數與參數個數匹配,如果不匹配,拋出一個異常.   
            if (commandParameters.Length != parameterValues.Length)
            {
                throw new ArgumentException("參數值個數與參數不匹配.");
            }

            // 給參數賦值   
            for (int i = 0, j = commandParameters.Length; i < j; i++)
            {
                // If the current array value derives from IDbDataParameter, then assign its Value property   
                if (parameterValues[i] is IDbDataParameter)
                {
                    IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];
                    if (paramInstance.Value == null)
                    {
                        commandParameters[i].Value = DBNull.Value;
                    }
                    else
                    {
                        commandParameters[i].Value = paramInstance.Value;
                    }
                }
                else if (parameterValues[i] == null)
                {
                    commandParameters[i].Value = DBNull.Value;
                }
                else
                {
                    commandParameters[i].Value = parameterValues[i];
                }
            }
        }

        /// <summary>   
        /// 預處理用戶提供的命令,數據庫連接/事務/命令類型/參數   
        /// </summary>   
        /// <param name="command">要處理的SqlCommand</param>   
        /// <param name="connection">數據庫連接</param>   
        /// <param name="transaction">一個有效的事務或者是null值</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本, 其它.)</param>   
        /// <param name="commandText">存儲過程名或都T-SQL命令文本</param>   
        /// <param name="commandParameters">和命令相關聯的SqlParameter參數數組,如果沒有參數爲'null'</param>   
        /// <param name="mustCloseConnection"><c>true</c> 如果連接是打開的,則爲true,其它情況下爲false.</param>   
        private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection)
        {
            if (command == null) throw new ArgumentNullException("command");
            if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

            // If the provided connection is not open, we will open it   
            if (connection.State != ConnectionState.Open)
            {
                mustCloseConnection = true;
                connection.Open();
            }
            else
            {
                mustCloseConnection = false;
            }

            // 給命令分配一個數據庫連接.   
            command.Connection = connection;

            // 設置命令文本(存儲過程名或SQL語句)   
            command.CommandText = commandText;

            // 分配事務   
            if (transaction != null)
            {
                if (transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                command.Transaction = transaction;
            }

            // 設置命令類型.   
            command.CommandType = commandType;

            // 分配命令參數   
            if (commandParameters != null)
            {
                AttachParameters(command, commandParameters);
            }
            return;
        }

        #endregion 私有構造函數和方法結束  

        #region 數據庫連接   
        /// <summary>   
        /// 一個有效的數據庫連接字符串   
        /// </summary>   
        /// <returns></returns>   
        //public static string GetConnSting()
        //{
        //    return ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString;
        //}
        /// <summary>   
        /// 一個有效的數據庫連接對象   
        /// </summary>   
        /// <returns></returns>   
        //public static SqlConnection GetConnection()
        //{
        //    SqlConnection Connection = new SqlConnection(SqlDbHelper.GetConnSting());
        //    return Connection;
        //}
        #endregion

        #region ExecuteNonQuery命令  

        /// <summary>   
        /// 執行指定連接字符串,類型的SqlCommand.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本, 其它.)</param>   
        /// <param name="commandText">存儲過程名稱或SQL語句</param>   
        /// <returns>返回命令影響的行數</returns>   
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
        {
            return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>   
        /// 執行指定連接字符串,類型的SqlCommand.如果沒有提供參數,不返回結果.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本, 其它.)</param>   
        /// <param name="commandText">存儲過程名稱或SQL語句</param>   
        /// <param name="commandParameters">SqlParameter參數數組</param>   
        /// <returns>返回命令影響的行數</returns>   
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                return ExecuteNonQuery(connection, commandType, commandText, commandParameters);
            }
        }

        /// <summary>   
        /// 執行指定連接字符串的存儲過程,將對象數組的值賦給存儲過程參數,   
        /// 此方法需要在參數緩存方法中探索參數並生成參數.   
        /// </summary>   
        /// <remarks>   
        /// 這個方法沒有提供訪問輸出參數和返回值.   
        /// 示例:    
        ///  int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符串/param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="parameterValues">分配到存儲過程輸入參數的對象數組</param>   
        /// <returns>返回受影響的行數</returns>   
        public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果存在參數值   
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從探索存儲過程參數(加載到緩存)並分配給存儲過程參數數組.   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 給存儲過程參數賦值   
                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數情況下   
                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的命令   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="commandType">命令類型(存儲過程,命令文本或其它.)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <returns>返回影響的行數</returns>   
        public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)
        {
            return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的命令   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="commandType">命令類型(存儲過程,命令文本或其它.)</param>   
        /// <param name="commandText">T存儲過程名稱或T-SQL語句</param>   
        /// <param name="commandParameters">SqlParamter參數數組</param>   
        /// <returns>返回影響的行數</returns>   
        public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connection == null) throw new ArgumentNullException("connection");

            // 創建SqlCommand命令,並進行預處理   
            SqlCommand cmd = new SqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

            // Finally, execute the command   
            int retval = cmd.ExecuteNonQuery();

            // 清除參數,以便再次使用.   
            cmd.Parameters.Clear();
            if (mustCloseConnection)
                connection.Close();
            return retval;
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的命令,將對象數組的值賦給存儲過程參數.   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸出參數和返回值   
        /// 示例:    
        ///  int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="spName">存儲過程名</param>   
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        /// <returns>返回影響的行數</returns>   
        public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數值   
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 給存儲過程分配參數值   
                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行帶事務的SqlCommand.   
        /// </summary>   
        /// <remarks>   
        /// 示例.:    
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");   
        /// </remarks>   
        /// <param name="transaction">一個有效的數據庫連接對象</param>   
        /// <param name="commandType">命令類型(存儲過程,命令文本或其它.)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <returns>返回影響的行數/returns>   
        public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>   
        /// 執行帶事務的SqlCommand(指定參數).   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="transaction">一個有效的數據庫連接對象</param>   
        /// <param name="commandType">命令類型(存儲過程,命令文本或其它.)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <param name="commandParameters">SqlParamter參數數組</param>   
        /// <returns>返回影響的行數</returns>   
        public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            // 預處理   
            SqlCommand cmd = new SqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

            // 執行   
            int retval = cmd.ExecuteNonQuery();

            // 清除參數集,以便再次使用.   
            cmd.Parameters.Clear();
            return retval;
        }

        /// <summary>   
        /// 執行帶事務的SqlCommand(指定參數值).   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸出參數和返回值   
        /// 示例:    
        ///  int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);   
        /// </remarks>   
        /// <param name="transaction">一個有效的數據庫連接對象</param>   
        /// <param name="spName">存儲過程名</param>   
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        /// <returns>返回受影響的行數</returns>   
        public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數值   
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 給存儲過程參數賦值   
                AssignParameterValues(commandParameters, parameterValues);

                // 調用重載方法   
                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數值   
                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion ExecuteNonQuery方法結束  

        #region ExecuteDataset方法  

        /// <summary>   
        /// 執行指定數據庫連接字符串的命令,返回DataSet.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <returns>返回一個包含結果集的DataSet</returns>   
        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
        {
            return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>   
        /// 執行指定數據庫連接字符串的命令,返回DataSet.   
        /// </summary>   
        /// <remarks>   
        /// 示例:   
        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <param name="commandParameters">SqlParamters參數數組</param>   
        /// <returns>返回一個包含結果集的DataSet</returns>   
        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            // 創建並打開數據庫連接對象,操作完成釋放對象.   
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                // 調用指定數據庫連接字符串重載方法.   
                return ExecuteDataset(connection, commandType, commandText, commandParameters);
            }
        }

        /// <summary>   
        /// 執行指定數據庫連接字符串的命令,直接提供參數值,返回DataSet.   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸出參數和返回值.   
        /// 示例:   
        ///  DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="spName">存儲過程名</param>   
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        /// <returns>返回一個包含結果集的DataSet</returns>   
        public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中檢索存儲過程參數   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 給存儲過程參數分配值   
                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的命令,返回DataSet.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名或T-SQL語句</param>   
        /// <returns>返回一個包含結果集的DataSet</returns>   
        public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
        {
            return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的命令,指定存儲過程參數,返回DataSet.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名或T-SQL語句</param>   
        /// <param name="commandParameters">SqlParamter參數數組</param>   
        /// <returns>返回一個包含結果集的DataSet</returns>   
        public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connection == null) throw new ArgumentNullException("connection");

            // 預處理   
            SqlCommand cmd = new SqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

            // 創建SqlDataAdapter和DataSet.   
            using (SqlDataAdapter da = new SqlDataAdapter(cmd))
            {
                DataSet ds = new DataSet();

                // 填充DataSet.   
                da.Fill(ds);

                cmd.Parameters.Clear();

                if (mustCloseConnection)
                    connection.Close();

                return ds;
            }
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的命令,指定參數值,返回DataSet.   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸入參數和返回值.   
        /// 示例.:    
        ///  DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="spName">存儲過程名</param>   
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        /// <returns>返回一個包含結果集的DataSet</returns>   
        public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 比緩存中加載存儲過程參數   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 給存儲過程參數分配值   
                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行指定事務的命令,返回DataSet.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");   
        /// </remarks>   
        /// <param name="transaction">事務</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名或T-SQL語句</param>   
        /// <returns>返回一個包含結果集的DataSet</returns>   
        public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>   
        /// 執行指定事務的命令,指定參數,返回DataSet.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="transaction">事務</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名或T-SQL語句</param>   
        /// <param name="commandParameters">SqlParamter參數數組</param>   
        /// <returns>返回一個包含結果集的DataSet</returns>   
        public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            // 預處理   
            SqlCommand cmd = new SqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

            // 創建 DataAdapter & DataSet   
            using (SqlDataAdapter da = new SqlDataAdapter(cmd))
            {
                DataSet ds = new DataSet();
                da.Fill(ds);
                cmd.Parameters.Clear();
                return ds;
            }
        }

        /// <summary>   
        /// 執行指定事務的命令,指定參數值,返回DataSet.   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸入參數和返回值.   
        /// 示例.:    
        ///  DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);   
        /// </remarks>   
        /// <param name="transaction">事務</param>   
        /// <param name="spName">存儲過程名</param>   
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        /// <returns>返回一個包含結果集的DataSet</returns>   
        public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 給存儲過程參數分配值   
                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion ExecuteDataset數據集命令結束  

        #region ExecuteReader 數據閱讀器  

        /// <summary>   
        /// 枚舉,標識數據庫連接是由SqlHelper提供還是由調用者提供   
        /// </summary>   
        private enum SqlConnectionOwnership
        {
            /// <summary>由SqlHelper提供連接</summary>   
            Internal,
            /// <summary>由調用者提供連接</summary>   
            External
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的數據閱讀器.   
        /// </summary>   
        /// <remarks>   
        /// 如果是SqlHelper打開連接,當連接關閉DataReader也將關閉.   
        /// 如果是調用都打開連接,DataReader由調用都管理.   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="transaction">一個有效的事務,或者爲 'null'</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名或T-SQL語句</param>   
        /// <param name="commandParameters">SqlParameters參數數組,如果沒有參數則爲'null'</param>   
        /// <param name="connectionOwnership">標識數據庫連接對象是由調用者提供還是由SqlHelper提供</param>   
        /// <returns>返回包含結果集的SqlDataReader</returns>   
        private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)
        {
            if (connection == null) throw new ArgumentNullException("connection");

            bool mustCloseConnection = false;
            // 創建命令   
            SqlCommand cmd = new SqlCommand();
            try
            {
                PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

                // 創建數據閱讀器   
                SqlDataReader dataReader;

                if (connectionOwnership == SqlConnectionOwnership.External)
                {
                    dataReader = cmd.ExecuteReader();
                }
                else
                {
                    dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                }

                // 清除參數,以便再次使用..   
                // HACK: There is a problem here, the output parameter values are fletched   
                // when the reader is closed, so if the parameters are detached from the command   
                // then the SqlReader can磘 set its values.   
                // When this happen, the parameters can磘 be used again in other command.   
                bool canClear = true;
                foreach (SqlParameter commandParameter in cmd.Parameters)
                {
                    if (commandParameter.Direction != ParameterDirection.Input)
                        canClear = false;
                }

                if (canClear)
                {
                    cmd.Parameters.Clear();
                }

                return dataReader;
            }
            catch
            {
                if (mustCloseConnection)
                    connection.Close();
                throw;
            }
        }

        /// <summary>   
        /// 執行指定數據庫連接字符串的數據閱讀器.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名或T-SQL語句</param>   
        /// <returns>返回包含結果集的SqlDataReader</returns>   
        public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
        {
            return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>   
        /// 執行指定數據庫連接字符串的數據閱讀器,指定參數.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名或T-SQL語句</param>   
        /// <param name="commandParameters">SqlParamter參數數組(new SqlParameter("@prodid", 24))</param>   
        /// <returns>返回包含結果集的SqlDataReader</returns>   
        public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            SqlConnection connection = null;
            try
            {
                connection = new SqlConnection(connectionString);
                connection.Open();

                return ExecuteReader(connection, null, commandType, commandText, commandParameters, SqlConnectionOwnership.Internal);
            }
            catch
            {
                // If we fail to return the SqlDatReader, we need to close the connection ourselves   
                if (connection != null) connection.Close();
                throw;
            }

        }

        /// <summary>   
        /// 執行指定數據庫連接字符串的數據閱讀器,指定參數值.   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數.   
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="spName">存儲過程名</param>   
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        /// <returns>返回包含結果集的SqlDataReader</returns>   
        public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的數據閱讀器.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名或T-SQL語句</param>   
        /// <returns>返回包含結果集的SqlDataReader</returns>   
        public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)
        {
            return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>   
        /// [調用者方式]執行指定數據庫連接對象的數據閱讀器,指定參數.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandParameters">SqlParamter參數數組</param>   
        /// <returns>返回包含結果集的SqlDataReader</returns>   
        public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            return ExecuteReader(connection, (SqlTransaction)null, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
        }

        /// <summary>   
        /// [調用者方式]執行指定數據庫連接對象的數據閱讀器,指定參數值.   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數.   
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="spName">T存儲過程名</param>   
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        /// <returns>返回包含結果集的SqlDataReader</returns>   
        public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return ExecuteReader(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// [調用者方式]執行指定數據庫事務的數據閱讀器,指定參數值.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");   
        /// </remarks>   
        /// <param name="transaction">一個有效的連接事務</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <returns>返回包含結果集的SqlDataReader</returns>   
        public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>   
        /// [調用者方式]執行指定數據庫事務的數據閱讀器,指定參數.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="transaction">一個有效的連接事務</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <param name="commandParameters">分配給命令的SqlParamter參數數組</param>   
        /// <returns>返回包含結果集的SqlDataReader</returns>   
        public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
        }

        /// <summary>   
        /// [調用者方式]執行指定數據庫事務的數據閱讀器,指定參數值.   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數.   
        ///   
        /// 示例:    
        ///  SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);   
        /// </remarks>   
        /// <param name="transaction">一個有效的連接事務</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        /// <returns>返回包含結果集的SqlDataReader</returns>   
        public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數值   
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數值   
                return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion ExecuteReader數據閱讀器  

        #region ExecuteScalar 返回結果集中的第一行第一列  

        /// <summary>   
        /// 執行指定數據庫連接字符串的命令,返回結果集中的第一行第一列.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <returns>返回結果集中的第一行第一列</returns>   
        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
        {
            // 執行參數爲空的方法   
            return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>   
        /// 執行指定數據庫連接字符串的命令,指定參數,返回結果集中的第一行第一列.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <param name="commandParameters">分配給命令的SqlParamter參數數組</param>   
        /// <returns>返回結果集中的第一行第一列</returns>   
        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            // 創建並打開數據庫連接對象,操作完成釋放對象.   
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                // 調用指定數據庫連接字符串重載方法.   
                return ExecuteScalar(connection, commandType, commandText, commandParameters);
            }
        }

        /// <summary>   
        /// 執行指定數據庫連接字符串的命令,指定參數值,返回結果集中的第一行第一列.   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數.   
        ///   
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        /// <returns>返回結果集中的第一行第一列</returns>   
        public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數值   
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 給存儲過程參數賦值   
                AssignParameterValues(commandParameters, parameterValues);

                // 調用重載方法   
                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數值   
                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的命令,返回結果集中的第一行第一列.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <returns>返回結果集中的第一行第一列</returns>   
        public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)
        {
            // 執行參數爲空的方法   
            return ExecuteScalar(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的命令,指定參數,返回結果集中的第一行第一列.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <param name="commandParameters">分配給命令的SqlParamter參數數組</param>   
        /// <returns>返回結果集中的第一行第一列</returns>   
        public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connection == null) throw new ArgumentNullException("connection");

            // 創建SqlCommand命令,並進行預處理   
            SqlCommand cmd = new SqlCommand();

            bool mustCloseConnection = false;
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

            // 執行SqlCommand命令,並返回結果.   
            object retval = cmd.ExecuteScalar();

            // 清除參數,以便再次使用.   
            cmd.Parameters.Clear();

            if (mustCloseConnection)
                connection.Close();

            return retval;
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的命令,指定參數值,返回結果集中的第一行第一列.   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數.   
        ///   
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        /// <returns>返回結果集中的第一行第一列</returns>   
        public static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數值   
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 給存儲過程參數賦值   
                AssignParameterValues(commandParameters, parameterValues);

                // 調用重載方法   
                return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數值   
                return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行指定數據庫事務的命令,返回結果集中的第一行第一列.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");   
        /// </remarks>   
        /// <param name="transaction">一個有效的連接事務</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <returns>返回結果集中的第一行第一列</returns>   
        public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            // 執行參數爲空的方法   
            return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>   
        /// 執行指定數據庫事務的命令,指定參數,返回結果集中的第一行第一列.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="transaction">一個有效的連接事務</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <param name="commandParameters">分配給命令的SqlParamter參數數組</param>   
        /// <returns>返回結果集中的第一行第一列</returns>   
        public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            // 創建SqlCommand命令,並進行預處理   
            SqlCommand cmd = new SqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

            // 執行SqlCommand命令,並返回結果.   
            object retval = cmd.ExecuteScalar();

            // 清除參數,以便再次使用.   
            cmd.Parameters.Clear();
            return retval;
        }

        /// <summary>   
        /// 執行指定數據庫事務的命令,指定參數值,返回結果集中的第一行第一列.   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數.   
        ///   
        /// 示例:    
        ///  int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);   
        /// </remarks>   
        /// <param name="transaction">一個有效的連接事務</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        /// <returns>返回結果集中的第一行第一列</returns>   
        public static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數值   
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // PPull the parameters for this stored procedure from the parameter cache ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 給存儲過程參數賦值   
                AssignParameterValues(commandParameters, parameterValues);

                // 調用重載方法   
                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數值   
                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion ExecuteScalar  

        #region ExecuteXmlReader XML閱讀器   
        /// <summary>   
        /// 執行指定數據庫連接對象的SqlCommand命令,併產生一個XmlReader對象做爲結果集返回.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句 using "FOR XML AUTO"</param>   
        /// <returns>返回XmlReader結果集對象.</returns>   
        public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)
        {
            // 執行參數爲空的方法   
            return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的SqlCommand命令,併產生一個XmlReader對象做爲結果集返回,指定參數.  
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句 using "FOR XML AUTO"</param>   
        /// <param name="commandParameters">分配給命令的SqlParamter參數數組</param>   
        /// <returns>返回XmlReader結果集對象.</returns>   
        public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connection == null) throw new ArgumentNullException("connection");

            bool mustCloseConnection = false;
            // 創建SqlCommand命令,並進行預處理   
            SqlCommand cmd = new SqlCommand();
            try
            {
                PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

                // 執行命令   
                XmlReader retval = cmd.ExecuteXmlReader();

                // 清除參數,以便再次使用.   
                cmd.Parameters.Clear();

                return retval;
            }
            catch
            {
                if (mustCloseConnection)
                    connection.Close();
                throw;
            }
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的SqlCommand命令,併產生一個XmlReader對象做爲結果集返回,指定參數值.   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數.   
        ///   
        /// 示例:    
        ///  XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="spName">存儲過程名稱 using "FOR XML AUTO"</param>   
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        /// <returns>返回XmlReader結果集對象.</returns>   
        public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數值   
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 給存儲過程參數賦值   
                AssignParameterValues(commandParameters, parameterValues);

                // 調用重載方法   
                return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數值   
                return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行指定數據庫事務的SqlCommand命令,併產生一個XmlReader對象做爲結果集返回.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");   
        /// </remarks>   
        /// <param name="transaction">一個有效的連接事務</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句 using "FOR XML AUTO"</param>   
        /// <returns>返回XmlReader結果集對象.</returns>   
        public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            // 執行參數爲空的方法   
            return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary>   
        /// 執行指定數據庫事務的SqlCommand命令,併產生一個XmlReader對象做爲結果集返回,指定參數.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="transaction">一個有效的連接事務</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句 using "FOR XML AUTO"</param>   
        /// <param name="commandParameters">分配給命令的SqlParamter參數數組</param>   
        /// <returns>返回XmlReader結果集對象.</returns>   
        public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            // 創建SqlCommand命令,並進行預處理   
            SqlCommand cmd = new SqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

            // 執行命令   
            XmlReader retval = cmd.ExecuteXmlReader();

            // 清除參數,以便再次使用.   
            cmd.Parameters.Clear();
            return retval;
        }

        /// <summary>   
        /// 執行指定數據庫事務的SqlCommand命令,併產生一個XmlReader對象做爲結果集返回,指定參數值.   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數.   
        ///   
        /// 示例:    
        ///  XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36);   
        /// </remarks>   
        /// <param name="transaction">一個有效的連接事務</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        /// <returns>返回一個包含結果集的DataSet.</returns>   
        public static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數值   
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 給存儲過程參數賦值   
                AssignParameterValues(commandParameters, parameterValues);

                // 調用重載方法   
                return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數值   
                return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion ExecuteXmlReader 閱讀器結束  

        #region FillDataset 填充數據集   
        /// <summary>   
        /// 執行指定數據庫連接字符串的命令,映射數據表並填充數據集.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <param name="dataSet">要填充結果集的DataSet實例</param>   
        /// <param name="tableNames">表映射的數據表數組   
        /// 用戶定義的表名 (可有是實際的表名.)</param>   
        public static void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (dataSet == null) throw new ArgumentNullException("dataSet");

            // 創建並打開數據庫連接對象,操作完成釋放對象.   
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                // 調用指定數據庫連接字符串重載方法.   
                FillDataset(connection, commandType, commandText, dataSet, tableNames);
            }
        }

        /// <summary>   
        /// 執行指定數據庫連接字符串的命令,映射數據表並填充數據集.指定命令參數.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <param name="commandParameters">分配給命令的SqlParamter參數數組</param>   
        /// <param name="dataSet">要填充結果集的DataSet實例</param>   
        /// <param name="tableNames">表映射的數據表數組   
        /// 用戶定義的表名 (可有是實際的表名.)   
        /// </param>   
        public static void FillDataset(string connectionString, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (dataSet == null) throw new ArgumentNullException("dataSet");
            // 創建並打開數據庫連接對象,操作完成釋放對象.   
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                // 調用指定數據庫連接字符串重載方法.   
                FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);
            }
        }

        /// <summary>   
        /// 執行指定數據庫連接字符串的命令,映射數據表並填充數據集,指定存儲過程參數值.   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數.   
        ///   
        /// 示例:    
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataSet">要填充結果集的DataSet實例</param>   
        /// <param name="tableNames">表映射的數據表數組   
        /// 用戶定義的表名 (可有是實際的表名.)   
        /// </param>      
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        public static void FillDataset(string connectionString, string spName,
            DataSet dataSet, string[] tableNames,
            params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (dataSet == null) throw new ArgumentNullException("dataSet");
            // 創建並打開數據庫連接對象,操作完成釋放對象.   
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                // 調用指定數據庫連接字符串重載方法.   
                FillDataset(connection, spName, dataSet, tableNames, parameterValues);
            }
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的命令,映射數據表並填充數據集.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <param name="dataSet">要填充結果集的DataSet實例</param>   
        /// <param name="tableNames">表映射的數據表數組   
        /// 用戶定義的表名 (可有是實際的表名.)   
        /// </param>      
        public static void FillDataset(SqlConnection connection, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames)
        {
            FillDataset(connection, commandType, commandText, dataSet, tableNames, null);
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的命令,映射數據表並填充數據集,指定參數.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <param name="dataSet">要填充結果集的DataSet實例</param>   
        /// <param name="tableNames">表映射的數據表數組   
        /// 用戶定義的表名 (可有是實際的表名.)   
        /// </param>   
        /// <param name="commandParameters">分配給命令的SqlParamter參數數組</param>   
        public static void FillDataset(SqlConnection connection, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlParameter[] commandParameters)
        {
            FillDataset(connection, null, commandType, commandText, dataSet, tableNames, commandParameters);
        }

        /// <summary>   
        /// 執行指定數據庫連接對象的命令,映射數據表並填充數據集,指定存儲過程參數值.   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數.   
        ///   
        /// 示例:    
        ///  FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataSet">要填充結果集的DataSet實例</param>   
        /// <param name="tableNames">表映射的數據表數組   
        /// 用戶定義的表名 (可有是實際的表名.)   
        /// </param>   
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        public static void FillDataset(SqlConnection connection, string spName,
            DataSet dataSet, string[] tableNames,
            params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (dataSet == null) throw new ArgumentNullException("dataSet");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數值   
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 給存儲過程參數賦值   
                AssignParameterValues(commandParameters, parameterValues);

                // 調用重載方法   
                FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
            }
            else
            {
                // 沒有參數值   
                FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);
            }
        }

        /// <summary>   
        /// 執行指定數據庫事務的命令,映射數據表並填充數據集.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});   
        /// </remarks>   
        /// <param name="transaction">一個有效的連接事務</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <param name="dataSet">要填充結果集的DataSet實例</param>   
        /// <param name="tableNames">表映射的數據表數組   
        /// 用戶定義的表名 (可有是實際的表名.)   
        /// </param>   
        public static void FillDataset(SqlTransaction transaction, CommandType commandType,
            string commandText,
            DataSet dataSet, string[] tableNames)
        {
            FillDataset(transaction, commandType, commandText, dataSet, tableNames, null);
        }

        /// <summary>   
        /// 執行指定數據庫事務的命令,映射數據表並填充數據集,指定參數.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="transaction">一個有效的連接事務</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <param name="dataSet">要填充結果集的DataSet實例</param>   
        /// <param name="tableNames">表映射的數據表數組   
        /// 用戶定義的表名 (可有是實際的表名.)   
        /// </param>   
        /// <param name="commandParameters">分配給命令的SqlParamter參數數組</param>   
        public static void FillDataset(SqlTransaction transaction, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlParameter[] commandParameters)
        {
            FillDataset(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);
        }

        /// <summary>   
        /// 執行指定數據庫事務的命令,映射數據表並填充數據集,指定存儲過程參數值.   
        /// </summary>   
        /// <remarks>   
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數.   
        ///   
        /// 示例:    
        ///  FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);   
        /// </remarks>   
        /// <param name="transaction">一個有效的連接事務</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataSet">要填充結果集的DataSet實例</param>   
        /// <param name="tableNames">表映射的數據表數組   
        /// 用戶定義的表名 (可有是實際的表名.)   
        /// </param>   
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param>   
        public static void FillDataset(SqlTransaction transaction, string spName,
            DataSet dataSet, string[] tableNames,
            params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (dataSet == null) throw new ArgumentNullException("dataSet");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數值   
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 給存儲過程參數賦值   
                AssignParameterValues(commandParameters, parameterValues);

                // 調用重載方法   
                FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
            }
            else
            {
                // 沒有參數值   
                FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);
            }
        }

        /// <summary>   
        /// [私有方法][內部調用]執行指定數據庫連接對象/事務的命令,映射數據表並填充數據集,DataSet/TableNames/SqlParameters.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="transaction">一個有效的連接事務</param>   
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param>   
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param>   
        /// <param name="dataSet">要填充結果集的DataSet實例</param>   
        /// <param name="tableNames">表映射的數據表數組   
        /// 用戶定義的表名 (可有是實際的表名.)   
        /// </param>   
        /// <param name="commandParameters">分配給命令的SqlParamter參數數組</param>   
        private static void FillDataset(SqlConnection connection, SqlTransaction transaction, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlParameter[] commandParameters)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (dataSet == null) throw new ArgumentNullException("dataSet");

            // 創建SqlCommand命令,並進行預處理   
            SqlCommand command = new SqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

            // 執行命令   
            using (SqlDataAdapter dataAdapter = new SqlDataAdapter(command))
            {

                // 追加表映射   
                if (tableNames != null && tableNames.Length > 0)
                {
                    string tableName = "Table";
                    for (int index = 0; index < tableNames.Length; index++)
                    {
                        if (tableNames[index] == null || tableNames[index].Length == 0) throw new ArgumentException("The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames");
                        dataAdapter.TableMappings.Add(tableName, tableNames[index]);
                        tableName += (index + 1).ToString();
                    }
                }

                // 填充數據集使用默認表名稱   
                dataAdapter.Fill(dataSet);

                // 清除參數,以便再次使用.   
                command.Parameters.Clear();
            }

            if (mustCloseConnection)
                connection.Close();
        }
        #endregion

        #region UpdateDataset 更新數據集   
        /// <summary>   
        /// 執行數據集更新到數據庫,指定inserted, updated, or deleted命令.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");   
        /// </remarks>   
        /// <param name="insertCommand">[追加記錄]一個有效的T-SQL語句或存儲過程</param>   
        /// <param name="deleteCommand">[刪除記錄]一個有效的T-SQL語句或存儲過程</param>   
        /// <param name="updateCommand">[更新記錄]一個有效的T-SQL語句或存儲過程</param>   
        /// <param name="dataSet">要更新到數據庫的DataSet</param>   
        /// <param name="tableName">要更新到數據庫的DataTable</param>   
        public static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)
        {
            if (insertCommand == null) throw new ArgumentNullException("insertCommand");
            if (deleteCommand == null) throw new ArgumentNullException("deleteCommand");
            if (updateCommand == null) throw new ArgumentNullException("updateCommand");
            if (tableName == null || tableName.Length == 0) throw new ArgumentNullException("tableName");

            // 創建SqlDataAdapter,當操作完成後釋放.   
            using (SqlDataAdapter dataAdapter = new SqlDataAdapter())
            {
                // 設置數據適配器命令   
                dataAdapter.UpdateCommand = updateCommand;
                dataAdapter.InsertCommand = insertCommand;
                dataAdapter.DeleteCommand = deleteCommand;

                // 更新數據集改變到數據庫   
                dataAdapter.Update(dataSet, tableName);

                // 提交所有改變到數據集.   
                dataSet.AcceptChanges();
            }
        }
        #endregion

        #region CreateCommand 創建一條SqlCommand命令   
        /// <summary>   
        /// 創建SqlCommand命令,指定數據庫連接對象,存儲過程名和參數.   
        /// </summary>   
        /// <remarks>   
        /// 示例:    
        ///  SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="sourceColumns">源表的列名稱數組</param>   
        /// <returns>返回SqlCommand命令</returns>   
        public static SqlCommand CreateCommand(SqlConnection connection, string spName, params string[] sourceColumns)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 創建命令   
            SqlCommand cmd = new SqlCommand(spName, connection);
            cmd.CommandType = CommandType.StoredProcedure;

            // 如果有參數值   
            if ((sourceColumns != null) && (sourceColumns.Length > 0))
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 將源表的列到映射到DataSet命令中.   
                for (int index = 0; index < sourceColumns.Length; index++)
                    commandParameters[index].SourceColumn = sourceColumns[index];

                // Attach the discovered parameters to the SqlCommand object   
                AttachParameters(cmd, commandParameters);
            }

            return cmd;
        }
        #endregion

        #region ExecuteNonQueryTypedParams 類型化參數(DataRow)   
        /// <summary>   
        /// 執行指定連接數據庫連接字符串的存儲過程,使用DataRow做爲參數值,返回受影響的行數.   
        /// </summary>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataRow">使用DataRow作爲參數值</param>   
        /// <returns>返回影響的行數</returns>   
        public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化.   
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 分配參數值   
                AssignParameterValues(commandParameters, dataRow);

                return SqlDbHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlDbHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行指定連接數據庫連接對象的存儲過程,使用DataRow做爲參數值,返回受影響的行數.   
        /// </summary>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataRow">使用DataRow作爲參數值</param>   
        /// <returns>返回影響的行數</returns>   
        public static int ExecuteNonQueryTypedParams(SqlConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化.   
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 分配參數值   
                AssignParameterValues(commandParameters, dataRow);

                return SqlDbHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlDbHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行指定連接數據庫事物的存儲過程,使用DataRow做爲參數值,返回受影響的行數.   
        /// </summary>   
        /// <param name="transaction">一個有效的連接事務 object</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataRow">使用DataRow作爲參數值</param>   
        /// <returns>返回影響的行數</returns>   
        public static int ExecuteNonQueryTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // Sf the row has values, the store procedure parameters must be initialized   
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 分配參數值   
                AssignParameterValues(commandParameters, dataRow);

                return SqlDbHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlDbHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
            }
        }
        #endregion

        #region ExecuteDatasetTypedParams 類型化參數(DataRow)   
        /// <summary>   
        /// 執行指定連接數據庫連接字符串的存儲過程,使用DataRow做爲參數值,返回DataSet.   
        /// </summary>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataRow">使用DataRow作爲參數值</param>   
        /// <returns>返回一個包含結果集的DataSet.</returns>   
        public static DataSet ExecuteDatasetTypedParams(string connectionString, String spName, DataRow dataRow)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            //如果row有值,存儲過程必須初始化.   
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 分配參數值   
                AssignParameterValues(commandParameters, dataRow);

                return SqlDbHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlDbHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行指定連接數據庫連接對象的存儲過程,使用DataRow做爲參數值,返回DataSet.   
        /// </summary>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataRow">使用DataRow作爲參數值</param>   
        /// <returns>返回一個包含結果集的DataSet.</returns>   
        ///   
        public static DataSet ExecuteDatasetTypedParams(SqlConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化.   
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 分配參數值   
                AssignParameterValues(commandParameters, dataRow);

                return SqlDbHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlDbHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行指定連接數據庫事務的存儲過程,使用DataRow做爲參數值,返回DataSet.   
        /// </summary>   
        /// <param name="transaction">一個有效的連接事務 object</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataRow">使用DataRow作爲參數值</param>   
        /// <returns>返回一個包含結果集的DataSet.</returns>   
        public static DataSet ExecuteDatasetTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化.   
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 分配參數值   
                AssignParameterValues(commandParameters, dataRow);

                return SqlDbHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlDbHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion

        #region ExecuteReaderTypedParams 類型化參數(DataRow)   
        /// <summary>   
        /// 執行指定連接數據庫連接字符串的存儲過程,使用DataRow做爲參數值,返回DataReader.   
        /// </summary>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataRow">使用DataRow作爲參數值</param>   
        /// <returns>返回包含結果集的SqlDataReader</returns>   
        public static SqlDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化.   
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 分配參數值   
                AssignParameterValues(commandParameters, dataRow);

                return SqlDbHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlDbHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
            }
        }


        /// <summary>   
        /// 執行指定連接數據庫連接對象的存儲過程,使用DataRow做爲參數值,返回DataReader.   
        /// </summary>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataRow">使用DataRow作爲參數值</param>   
        /// <returns>返回包含結果集的SqlDataReader</returns>   
        public static SqlDataReader ExecuteReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化.   
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 分配參數值   
                AssignParameterValues(commandParameters, dataRow);

                return SqlDbHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlDbHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行指定連接數據庫事物的存儲過程,使用DataRow做爲參數值,返回DataReader.   
        /// </summary>   
        /// <param name="transaction">一個有效的連接事務 object</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataRow">使用DataRow作爲參數值</param>   
        /// <returns>返回包含結果集的SqlDataReader</returns>   
        public static SqlDataReader ExecuteReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化.   
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 分配參數值   
                AssignParameterValues(commandParameters, dataRow);

                return SqlDbHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlDbHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);
            }
        }
        #endregion

        #region ExecuteScalarTypedParams 類型化參數(DataRow)   
        /// <summary>   
        /// 執行指定連接數據庫連接字符串的存儲過程,使用DataRow做爲參數值,返回結果集中的第一行第一列.   
        /// </summary>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataRow">使用DataRow作爲參數值</param>   
        /// <returns>返回結果集中的第一行第一列</returns>   
        public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化.   
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 分配參數值   
                AssignParameterValues(commandParameters, dataRow);

                return SqlDbHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlDbHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行指定連接數據庫連接對象的存儲過程,使用DataRow做爲參數值,返回結果集中的第一行第一列.  
        /// </summary>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataRow">使用DataRow作爲參數值</param>   
        /// <returns>返回結果集中的第一行第一列</returns>   
        public static object ExecuteScalarTypedParams(SqlConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化.   
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 分配參數值   
                AssignParameterValues(commandParameters, dataRow);

                return SqlDbHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlDbHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行指定連接數據庫事務的存儲過程,使用DataRow做爲參數值,返回結果集中的第一行第一列.   
        /// </summary>   
        /// <param name="transaction">一個有效的連接事務 object</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataRow">使用DataRow作爲參數值</param>   
        /// <returns>返回結果集中的第一行第一列</returns>   
        public static object ExecuteScalarTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化.   
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 分配參數值   
                AssignParameterValues(commandParameters, dataRow);

                return SqlDbHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlDbHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
            }
        }
        #endregion

        #region ExecuteXmlReaderTypedParams 類型化參數(DataRow)   
        /// <summary>   
        /// 執行指定連接數據庫連接對象的存儲過程,使用DataRow做爲參數值,返回XmlReader類型的結果集.   
        /// </summary>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataRow">使用DataRow作爲參數值</param>   
        /// <returns>返回XmlReader結果集對象.</returns>   
        public static XmlReader ExecuteXmlReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化.   
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 分配參數值   
                AssignParameterValues(commandParameters, dataRow);

                return SqlDbHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlDbHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary>   
        /// 執行指定連接數據庫事務的存儲過程,使用DataRow做爲參數值,返回XmlReader類型的結果集.   
        /// </summary>   
        /// <param name="transaction">一個有效的連接事務 object</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="dataRow">使用DataRow作爲參數值</param>   
        /// <returns>返回XmlReader結果集對象.</returns>   
        public static XmlReader ExecuteXmlReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化.   
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. ()   
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 分配參數值   
                AssignParameterValues(commandParameters, dataRow);

                return SqlDbHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlDbHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
            }
        }
        #endregion

    }

    /// <summary>   
    /// SqlHelperParameterCache提供緩存存儲過程參數,並能夠在運行時從存儲過程中探索參數.   
    /// </summary>   
    public sealed class SqlHelperParameterCache
    {
        #region 私有方法,字段,構造函數   
        // 私有構造函數,妨止類被實例化.   
        private SqlHelperParameterCache() { }

        // 這個方法要注意   
        private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());

        /// <summary>   
        /// 探索運行時的存儲過程,返回SqlParameter參數數組.   
        /// 初始化參數值爲 DBNull.Value.   
        /// </summary>   
        /// <param name="connection">一個有效的數據庫連接</param>   
        /// <param name="spName">存儲過程名稱</param>   
        /// <param name="includeReturnValueParameter">是否包含返回值參數</param>   
        /// <returns>返回SqlParameter參數數組</returns>   
        private static SqlParameter[] DiscoverSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            SqlCommand cmd = new SqlCommand(spName, connection);
            cmd.CommandType = CommandType.StoredProcedure;

            connection.Open();
            // 檢索cmd指定的存儲過程的參數信息,並填充到cmd的Parameters參數集中.   
            SqlCommandBuilder.DeriveParameters(cmd);
            connection.Close();
            // 如果不包含返回值參數,將參數集中的每一個參數刪除.   
            if (!includeReturnValueParameter)
            {
                cmd.Parameters.RemoveAt(0);
            }

            // 創建參數數組   
            SqlParameter[] discoveredParameters = new SqlParameter[cmd.Parameters.Count];
            // 將cmd的Parameters參數集複製到discoveredParameters數組.   
            cmd.Parameters.CopyTo(discoveredParameters, 0);

            // 初始化參數值爲 DBNull.Value.   
            foreach (SqlParameter discoveredParameter in discoveredParameters)
            {
                discoveredParameter.Value = DBNull.Value;
            }
            return discoveredParameters;
        }

        /// <summary>   
        /// SqlParameter參數數組的深層拷貝.   
        /// </summary>   
        /// <param name="originalParameters">原始參數數組</param>   
        /// <returns>返回一個同樣的參數數組</returns>   
        private static SqlParameter[] CloneParameters(SqlParameter[] originalParameters)
        {
            SqlParameter[] clonedParameters = new SqlParameter[originalParameters.Length];

            for (int i = 0, j = originalParameters.Length; i < j; i++)
            {
                clonedParameters[i] = (SqlParameter)((ICloneable)originalParameters[i]).Clone();
            }

            return clonedParameters;
        }

        #endregion 私有方法,字段,構造函數結束  

        #region 緩存方法  

        /// <summary>   
        /// 追加參數數組到緩存.   
        /// </summary>   
        /// <param name="connectionString">一個有效的數據庫連接字符串</param>   
        /// <param name="commandText">存儲過程名或SQL語句</param>   
        /// <param name="commandParameters">要緩存的參數數組</param>   
        public static void CacheParameterSet(string connectionString, string commandText, params SqlParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

            string hashKey = connectionString + ":" + commandText;

            paramCache[hashKey] = commandParameters;
        }

        /// <summary>   
        /// 從緩存中獲取參數數組.   
        /// </summary>   
        /// <param name="connectionString">一個有效的數據庫連接字符</param>   
        /// <param name="commandText">存儲過程名或SQL語句</param>   
        /// <returns>參數數組</returns>   
        public static SqlParameter[] GetCachedParameterSet(string connectionString, string commandText)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

            string hashKey = connectionString + ":" + commandText;

            SqlParameter[] cachedParameters = paramCache[hashKey] as SqlParameter[];
            if (cachedParameters == null)
            {
                return null;
            }
            else
            {
                return CloneParameters(cachedParameters);
            }
        }

        #endregion 緩存方法結束  

        #region 檢索指定的存儲過程的參數集  

        /// <summary>   
        /// 返回指定的存儲過程的參數集   
        /// </summary>   
        /// <remarks>   
        /// 這個方法將查詢數據庫,並將信息存儲到緩存.   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符</param>   
        /// <param name="spName">存儲過程名</param>   
        /// <returns>返回SqlParameter參數數組</returns>   
        public static SqlParameter[] GetSpParameterSet(string connectionString, string spName)
        {
            return GetSpParameterSet(connectionString, spName, false);
        }

        /// <summary>   
        /// 返回指定的存儲過程的參數集   
        /// </summary>   
        /// <remarks>   
        /// 這個方法將查詢數據庫,並將信息存儲到緩存.   
        /// </remarks>   
        /// <param name="connectionString">一個有效的數據庫連接字符.</param>   
        /// <param name="spName">存儲過程名</param>   
        /// <param name="includeReturnValueParameter">是否包含返回值參數</param>   
        /// <returns>返回SqlParameter參數數組</returns>   
        public static SqlParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);
            }
        }

        /// <summary>   
        /// [內部]返回指定的存儲過程的參數集(使用連接對象).   
        /// </summary>   
        /// <remarks>   
        /// 這個方法將查詢數據庫,並將信息存儲到緩存.   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接字符</param>   
        /// <param name="spName">存儲過程名</param>   
        /// <returns>返回SqlParameter參數數組</returns>   
        internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName)
        {
            return GetSpParameterSet(connection, spName, false);
        }

        /// <summary>   
        /// [內部]返回指定的存儲過程的參數集(使用連接對象)   
        /// </summary>   
        /// <remarks>   
        /// 這個方法將查詢數據庫,並將信息存儲到緩存.   
        /// </remarks>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="spName">存儲過程名</param>   
        /// <param name="includeReturnValueParameter">   
        /// 是否包含返回值參數   
        /// </param>   
        /// <returns>返回SqlParameter參數數組</returns>   
        internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            using (SqlConnection clonedConnection = (SqlConnection)((ICloneable)connection).Clone())
            {
                return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);
            }
        }

        /// <summary>   
        /// [私有]返回指定的存儲過程的參數集(使用連接對象)   
        /// </summary>   
        /// <param name="connection">一個有效的數據庫連接對象</param>   
        /// <param name="spName">存儲過程名</param>   
        /// <param name="includeReturnValueParameter">是否包含返回值參數</param>   
        /// <returns>返回SqlParameter參數數組</returns>   
        private static SqlParameter[] GetSpParameterSetInternal(SqlConnection connection, string spName, bool includeReturnValueParameter)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            string hashKey = connection.ConnectionString + ":" + spName + (includeReturnValueParameter ? ":include ReturnValue Parameter" : "");

            SqlParameter[] cachedParameters;

            cachedParameters = paramCache[hashKey] as SqlParameter[];
            if (cachedParameters == null)
            {
                SqlParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);
                paramCache[hashKey] = spParameters;
                cachedParameters = spParameters;
            }

            return CloneParameters(cachedParameters);
        }

        #endregion 參數集檢索結束  
    }