本文轉自：http://de.cel.blog.163.com/blog/static/5145123620110181003903/
類似於SQLHelper，只是這里引用的是MySql.Data類庫，而不是System.Data.SqlClient;因為.Net框架里面並不包含些類庫，好在咱們有強大的網友有做好的MySql.Data類庫。在網上一搜MySql.Data就可以找到的。注意一定要先添加對MySql.Data的引用哦，接下來是MySQLHelper的類庫代碼。
using System.Data;
using MySql.Data.MySqlClient;
namespace MySQLHelper
{
/// <summary>
/// 基於MySQL的數據層基類
/// </summary>
/// <remarks>
/// 參考於MS Petshop 4.0
/// </remarks>
public abstract class MySqlHelper
{
#region 數據庫連接字符串
public static readonly string DBConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["DBConnectionString"].ToString();
//public static readonly string DBConnectionString = "Server=localhost;DataBase=menagerie;Uid=de.cel;Pwd=de.cel"; //在MySql中localhost好像不能用"."代替，我試了一下，會出錯。
#endregion
#region PrepareCommand
/// <summary>
/// Command預處理
/// </summary>
/// <param name="conn">MySqlConnection對象</param>
/// <param name="trans">MySqlTransaction對象，可為null</param>
/// <param name="cmd">MySqlCommand對象</param>
/// <param name="cmdType">CommandType，存儲過程或命令行</param>
/// <param name="cmdText">SQL語句或存儲過程名</param>
/// <param name="cmdParms">MySqlCommand參數數組，可為null</param>
private static void PrepareCommand(MySqlConnection conn, MySqlTransaction trans, MySqlCommand cmd, CommandType cmdType, string cmdText, MySqlParameter[] cmdParms)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Connection = conn;
cmd.CommandText = cmdText;
if (trans != null)
cmd.Transaction = trans;
cmd.CommandType = cmdType;
if (cmdParms != null)
{
foreach (MySqlParameter parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
#endregion
#region ExecuteNonQuery
/// <summary>
/// 執行命令
/// </summary>
/// <param name="connectionString">數據庫連接字符串</param>
/// <param name="cmdType">命令類型（存儲過程或SQL語句）</param>
/// <param name="cmdText">SQL語句或存儲過程名</param>
/// <param name="cmdParms">MySqlCommand參數數組</param>
/// <returns>返回受引響的記錄行數</returns>
public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)
{
MySqlCommand cmd = new MySqlCommand();
using (MySqlConnection conn = new MySqlConnection(connectionString))
{
PrepareCommand(conn, null, cmd, cmdType, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
}
/// <summary>
/// 執行命令
/// </summary>
/// <param name="conn">Connection對象</param>
/// <param name="cmdType">命令類型（存儲過程或SQL語句）</param>
/// <param name="cmdText">SQL語句或存儲過程名</param>
/// <param name="cmdParms">MySqlCommand參數數組</param>
/// <returns>返回受引響的記錄行數</returns>
public static int ExecuteNonQuery(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)
{
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(conn, null, cmd, cmdType, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
/// <summary>
/// 執行事務
/// </summary>
/// <param name="trans">MySqlTransaction對象</param>
/// <param name="cmdType">命令類型（存儲過程或SQL語句）</param>
/// <param name="cmdText">SQL語句或存儲過程名</param>
/// <param name="cmdParms">MySqlCommand參數數組</param>
/// <returns>返回受引響的記錄行數</returns>
public static int ExecuteNonQuery(MySqlTransaction trans, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)
{
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(trans.Connection, trans, cmd, cmdType, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}
#endregion
#region ExecuteScalar
/// <summary>
/// 執行命令，返回第一行第一列的值
/// </summary>
/// <param name="connectionString">數據庫連接字符串</param>
/// <param name="cmdType">命令類型（存儲過程或SQL語句）</param>
/// <param name="cmdText">SQL語句或存儲過程名</param>
/// <param name="cmdParms">MySqlCommand參數數組</param>
/// <returns>返回Object對象</returns>
public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)
{
MySqlCommand cmd = new MySqlCommand();
using (MySqlConnection connection = new MySqlConnection(connectionString))
{
PrepareCommand(connection, null, cmd, cmdType, cmdText, cmdParms);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
}
/// <summary>
/// 執行命令，返回第一行第一列的值
/// </summary>
/// <param name="connectionString">數據庫連接字符串</param>
/// <param name="cmdType">命令類型（存儲過程或SQL語句）</param>
/// <param name="cmdText">SQL語句或存儲過程名</param>
/// <param name="cmdParms">MySqlCommand參數數組</param>
/// <returns>返回Object對象</returns>
public static object ExecuteScalar(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)
{
MySqlCommand cmd = new MySqlCommand();
PrepareCommand(conn, null, cmd, cmdType, cmdText, cmdParms);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
#endregion
#region ExecuteReader
/// <summary>
/// 執行命令或存儲過程，返回MySqlDataReader對象
/// 注意MySqlDataReader對象使用完后必須Close以釋放MySqlConnection資源
/// </summary>
/// <param name="connectionString">數據庫連接字符串</param>
/// <param name="cmdType">命令類型（存儲過程或SQL語句）</param>
/// <param name="cmdText">SQL語句或存儲過程名</param>
/// <param name="cmdParms">MySqlCommand參數數組</param>
/// <returns></returns>
public static MySqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)
{
MySqlCommand cmd = new MySqlCommand();
MySqlConnection conn = new MySqlConnection(connectionString);
try
{
PrepareCommand(conn, null, cmd, cmdType, cmdText, cmdParms);
MySqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return dr;
}
catch
{
conn.Close();
throw;
}
}
#endregion
#region ExecuteDataSet
/// <summary>
/// 執行命令或存儲過程，返回DataSet對象
/// </summary>
/// <param name="connectionString">數據庫連接字符串</param>
/// <param name="cmdType">命令類型(存儲過程或SQL語句)</param>
/// <param name="cmdText">SQL語句或存儲過程名</param>
/// <param name="cmdParms">MySqlCommand參數數組(可為null值)</param>
/// <returns></returns>
public static DataSet ExecuteDataSet(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)
{
MySqlCommand cmd = new MySqlCommand();
using (MySqlConnection conn = new MySqlConnection(connectionString))
{
PrepareCommand(conn, null, cmd, cmdType, cmdText, cmdParms);
MySqlDataAdapter da = new MySqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
conn.Close();
cmd.Parameters.Clear();
return ds;
}
}
#endregion
}//end class
}