DBHelper參考

 1using System;
  2using System.Collections.Generic;
  3using System.Text;
  4using System.Data;
  5using System.Data.SqlClient;
  6using System.Configuration;
  7namespace MyBookShop.DAL
  8{
  9    public static class DBHelper
 10    {
 11        public static SqlConnection connection;
 12        public static SqlConnection Connection
 13        {
 14            get
 15            {
 16                if (connection == null)
 17                {
 18                    //string connectionString = ConfigurationManager.ConnectionStrings["MyBookShop"].ConnectionString;
 19                    string strConn = @"Data Source=./SQLEXPRESS;Initial Catalog=MYBOOKSHOP;Integrated Security=True";
 20                 // string strConn = @"Data Source=MICROSOF-E36F55;integrated security=sspi;database=MyBookShop";
 21                    connection = new SqlConnection(strConn);
 22                    connection.Open();
 23                }
 24                else if (connection.State == ConnectionState.Closed)
 25                {
 26                    connection.Open();
 27                }
 28                else if (connection.State == ConnectionState.Broken)
 29                {
 30                    connection.Close();
 31                    connection.Open();
 32                }
 33                return connection;
 34            }
 35        }
 36        /**//// <summary>
 37        /// 執行增,刪,改,的方法
 38        /// </summary>
 39        /// <param name="commandText">sql,proc</param>
 40        /// <param name="commandType">CommandType</param>
 41        /// <param name="para"></param>
 42        /// <returns>int</returns>            
 43        public static int ExecuteCommand(string commandText, CommandType commandType,SqlParameter[] para)
 44        {
 45            SqlCommand cmd = new SqlCommand();
 46            cmd.Connection = Connection;
 47            cmd.CommandText = commandText;
 48            cmd.CommandType = commandType;
 49            try
 50            {
 51                if (para != null)
 52                {
 53                    cmd.Parameters.AddRange(para);
 54                }
 55                return cmd.ExecuteNonQuery();
 56            }
 57
 58            finally
 59            {
 60                connection.Close();
 61            }
 62        }
 63        /**//// <summary>
 64        /// 執行查詢的方法
 65        /// </summary>
 66        /// <param name="commandText"></param>
 67        /// <param name="commandType"></param>
 68        /// <param name="para"></param>
 69        /// <returns></returns>
 70        public static DataTable GetDataTable(string commandText, CommandType commandType, SqlParameter[] para)
 71        {
 72            SqlCommand cmd = new SqlCommand();
 73            cmd.Connection = Connection;
 74            cmd.CommandText = commandText;
 75            cmd.CommandType = commandType;
 76            try
 77            {
 78                if (para != null)
 79                {
 80                    cmd.Parameters.AddRange(para);
 81                }
 82                SqlDataAdapter da = new SqlDataAdapter(cmd);
 83                DataTable temp = new DataTable();
 84                da.Fill(temp);
 85                return temp;
 86            }
 87            finally
 88            {
 89                connection.Close();
 90            }
 91        }
 92        /**//// <summary>
 93        /// 執行少量查詢的方法
 94        /// </summary>
 95        /// <param name="commandText"></param>
 96        /// <param name="commandType"></param>
 97        /// <param name="para"></param>
 98        /// <returns></returns>
 99        public static SqlDataReader GetReader(string commandText, CommandType commandType, SqlParameter[] para)
100        {
101            SqlCommand cmd = new SqlCommand();
102            cmd.Connection = Connection;
103            cmd.CommandText = commandText;
104            cmd.CommandType = commandType;
105            if (para != null)
106            {
107                cmd.Parameters.AddRange(para);
108            }
109            return cmd.ExecuteReader();
110        }
111        /**//// <summary>
112        /// 執行聚合函數的方法
113        /// </summary>
114        /// <param name="commandText"></param>
115        /// <param name="commandType"></param>
116        /// <param name="para"></param>
117        /// <returns></returns>
118        public static object GetScalar(string commandText, CommandType commandType, SqlParameter[] para)
119        {
120            SqlCommand cmd = new SqlCommand();
121            cmd.Connection = Connection;
122            cmd.CommandText = commandText;
123            cmd.CommandType = commandType;
124            try
125           {
126                if (para != null)
127                {
128                    cmd.Parameters.AddRange(para);
129                }
130                return cmd.ExecuteScalar();
131            }
132            finally
133            {
134                connection.Close();
135            }
136        }
137    }
138}