[轉]MySQLHelper類

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本文轉自：http://de.cel.blog.163.com/blog/static/5145123620110181003903/

類似於SQLHelper，只是這裡引用的是MySql.Data類庫，而不是System.Data.SqlClient;因為.Net架構裡面並不包 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的資料層基類

    /// </summary>

    /// <remarks>

    /// 參考於MS Petshop 4.0

    /// </remarks>

    public abstract class MySqlHelper
    {

        #region 資料庫連接字串

        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預先處理

        /// </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，預存程序或命令列</param>

        /// <param name="cmdText">SQL語句或預存程序名</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">資料庫連接字串</param>

        /// <param name="cmdType">命令類型（預存程序或SQL語句）</param>

        /// <param name="cmdText">SQL語句或預存程序名</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（預存程序或SQL語句）</param>

        /// <param name="cmdText">SQL語句或預存程序名</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（預存程序或SQL語句）</param>

        /// <param name="cmdText">SQL語句或預存程序名</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">資料庫連接字串</param>

        /// <param name="cmdType">命令類型（預存程序或SQL語句）</param>

        /// <param name="cmdText">SQL語句或預存程序名</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">資料庫連接字串</param>

        /// <param name="cmdType">命令類型（預存程序或SQL語句）</param>

        /// <param name="cmdText">SQL語句或預存程序名</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>

        /// 執行命令或預存程序，返回MySqlDataReader對象

        /// 注意MySqlDataReader對象使用完後必須Close以釋放MySqlConnection資源

        /// </summary>

        /// <param name="connectionString">資料庫連接字串</param>

        /// <param name="cmdType">命令類型（預存程序或SQL語句）</param>

        /// <param name="cmdText">SQL語句或預存程序名</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>

        /// 執行命令或預存程序，返回DataSet對象

        /// </summary>

        /// <param name="connectionString">資料庫連接字串</param>

        /// <param name="cmdType">命令類型(預存程序或SQL語句)</param>

        /// <param name="cmdText">SQL語句或預存程序名</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

}

[轉]MySQLHelper類