ASP.NET 微軟官方 SQLServer 幫助類SqlHelper

微軟ASP.NET中使用SQL Server的基於C#的幫助類，可根據需求調用其中的服務

就一個幫助類感覺上傳資源再下載太麻煩大家可以直接創建一個SqlHelper.cs把代碼粘進去

using System;
using System.Data;
using System.Xml;
using System.Data.SqlClient;
using System.Collections;
using System.Configuration;
public sealed class SqlHelper
{
    #region 私有構造函數和方法

    private SqlHelper() { }

    /// <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["ConnString"].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(SqlHelper.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 SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
        }
        else
        {
            return SqlHelper.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 SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
        }
        else
        {
            return SqlHelper.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 SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
        }
        else
        {
            return SqlHelper.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 SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
        }
        else
        {
            return SqlHelper.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 SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
        }
        else
        {
            return SqlHelper.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 SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
        }
        else
        {
            return SqlHelper.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 SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
        }
        else
        {
            return SqlHelper.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 SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
        }
        else
        {
            return SqlHelper.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 SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
        }
        else
        {
            return SqlHelper.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 SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
        }
        else
        {
            return SqlHelper.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 SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
        }
        else
        {
            return SqlHelper.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 SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
        }
        else
        {
            return SqlHelper.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 SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
        }
        else
        {
            return SqlHelper.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 SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
        }
        else
        {
            return SqlHelper.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

}