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本文转自：http://de.cel.blog.163.com/blog/static/5145123620110181003903/
类似于SQLHelper，只是这里引用的是MySql.Data类库，而不是System.Data.SqlClient;因为.Net框架里面并不包 含些类库，好在咱们有强大的网友有做好的MySql.Data类库。在网上一搜MySql.Data就可以找到的。注意一定要先添加对 MySql.Data的引用哦，接下来是MySQLHelper的类库代码。
using System.Data;
using MySql.Data.MySqlClient;
namespace MySQLHelper
{
/// <summary>
/// 基于MySQL的数据层基类
/// </summary>
/// <remarks>
/// 参考于MS Petshop 4.0
/// </remarks>
public abstract class MySqlHelper
{
#region 数据库连接字符串
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，我试了一下，会出错。
#endregion
#region PrepareCommand
/// <summary>
/// Command预处理
/// </summary>
/// <param name="conn">MySqlConnection对象</param>
/// <param name="trans">MySqlTransaction对象，可为null</param>
/// <param name="cmd">MySqlCommand对象</param>
/// <param name="cmdType">CommandType，存储过程或命令行</param>
/// <param name="cmdText">SQL语句或存储过程名</param>
/// <param name="cmdParms">MySqlCommand参数数组，可为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>
/// 执行命令
/// </summary>
/// <param name="connectionString">数据库连接字符串</param>
/// <param name="cmdType">命令类型（存储过程或SQL语句）</param>
/// <param name="cmdText">SQL语句或存储过程名</param>
/// <param name="cmdParms">MySqlCommand参数数组</param>
/// <returns>返回受引响的记录行数</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>
/// 执行命令
/// </summary>
/// <param name="conn">Connection对象</param>
/// <param name="cmdType">命令类型（存储过程或SQL语句）</param>
/// <param name="cmdText">SQL语句或存储过程名</param>
/// <param name="cmdParms">MySqlCommand参数数组</param>
/// <returns>返回受引响的记录行数</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>
/// 执行事务
/// </summary>
/// <param name="trans">MySqlTransaction对象</param>
/// <param name="cmdType">命令类型（存储过程或SQL语句）</param>
/// <param name="cmdText">SQL语句或存储过程名</param>
/// <param name="cmdParms">MySqlCommand参数数组</param>
/// <returns>返回受引响的记录行数</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>
/// 执行命令，返回第一行第一列的值
/// </summary>
/// <param name="connectionString">数据库连接字符串</param>
/// <param name="cmdType">命令类型（存储过程或SQL语句）</param>
/// <param name="cmdText">SQL语句或存储过程名</param>
/// <param name="cmdParms">MySqlCommand参数数组</param>
/// <returns>返回Object对象</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>
/// 执行命令，返回第一行第一列的值
/// </summary>
/// <param name="connectionString">数据库连接字符串</param>
/// <param name="cmdType">命令类型（存储过程或SQL语句）</param>
/// <param name="cmdText">SQL语句或存储过程名</param>
/// <param name="cmdParms">MySqlCommand参数数组</param>
/// <returns>返回Object对象</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>
/// 执行命令或存储过程，返回MySqlDataReader对象
/// 注意MySqlDataReader对象使用完后必须Close以释放MySqlConnection资源
/// </summary>
/// <param name="connectionString">数据库连接字符串</param>
/// <param name="cmdType">命令类型（存储过程或SQL语句）</param>
/// <param name="cmdText">SQL语句或存储过程名</param>
/// <param name="cmdParms">MySqlCommand参数数组</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>
/// 执行命令或存储过程，返回DataSet对象
/// </summary>
/// <param name="connectionString">数据库连接字符串</param>
/// <param name="cmdType">命令类型(存储过程或SQL语句)</param>
/// <param name="cmdText">SQL语句或存储过程名</param>
/// <param name="cmdParms">MySqlCommand参数数组(可为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
}
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原文地址：http://www.cnblogs.com/xishuqingchun/p/5010432.html
