MySql數據庫操作類---MySqlHelper

 /// <summary>
    /// MySql數據庫操作類
    /// </summary>

    public class MySqlHelper
    {
        public static string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["MySQL"].ConnectionString;
        ////存儲過程
        public static DataTable ExecuteDataTableCommand(string CommandText)
        {
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {
                MySqlCommand cmd = new MySqlCommand();
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.CommandText = CommandText;
                using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
                {
                    DataSet ds = new DataSet();
                    try
                    {
                        da.Fill(ds, "ds");
                        cmd.Parameters.Clear();
                    }
                    catch (MySql.Data.MySqlClient.MySqlException ex)
                    {
                        throw new Exception(ex.Message);
                    }
                    return ds.Tables[0];
                }
            }
        }

        #region ExecuteNonQuery

        //執行SQL語句，返回影響的記錄數
        /// <summary>
        /// 執行SQL語句，返回影響的記錄數
        /// </summary>
        /// <param name="SQLString">SQL語句</param>
        /// <returns>影響的記錄數</returns>
        public static int ExecuteNonQuery(string SQLString)
        {
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {
                using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (MySql.Data.MySqlClient.MySqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }

        /// <summary>
        /// 執行SQL語句，返回影響的記錄數
        /// </summary>
        /// <param name="SQLString">SQL語句</param>
        /// <returns>影響的記錄數</returns>
        public static int ExecuteNonQuery(string SQLString, params MySqlParameter[] cmdParms)
        {
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {
                using (MySqlCommand cmd = new MySqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        int rows = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                        return rows;
                    }
                    catch (MySql.Data.MySqlClient.MySqlException e)
                    {
                        throw e;
                    }
                }
            }
        }

        /// <summary>
        /// 是否存在
        /// </summary>
        /// <param name="strSql"></param>
        /// <returns></returns>
        public static bool Exists(string strSql)
        {
            object obj = GetSingle(strSql);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = 1;
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

        /// <summary>
        /// 執行一條計算查詢結果語句，返回查詢結果（object）。
        /// </summary>
        /// <param name="SQLString">計算查詢結果語句</param>
        /// <returns>查詢結果（object）</returns>
        public static object GetSingle(string SQLString)
        {
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {
                using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        object obj = cmd.ExecuteScalar();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (MySql.Data.MySqlClient.MySqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }

        public static object GetSingle(string SQLString, int Times)
        {
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {
                using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        cmd.CommandTimeout = Times;
                        object obj = cmd.ExecuteScalar();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (MySql.Data.MySqlClient.MySqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }

        //執行多條SQL語句，實現數據庫事務。
        /// <summary>
        /// 執行多條SQL語句，實現數據庫事務。
        /// </summary>
        /// <param name="SQLStringList">多條SQL語句</param>
        public static bool ExecuteNoQueryTran(List<String> SQLStringList)
        {
            using (MySqlConnection conn = new MySqlConnection(connectionString))
            {
                conn.Open();
                MySqlCommand cmd = new MySqlCommand();
                cmd.Connection = conn;
                MySqlTransaction tx = conn.BeginTransaction();
                cmd.Transaction = tx;
                try
                {
                    for (int n = 0; n < SQLStringList.Count; n++)
                    {
                        string strsql = SQLStringList[n];
                        if (strsql.Trim().Length > 1)
                        {
                            cmd.CommandText = strsql;
                            PrepareCommand(cmd, conn, tx, strsql, null);
                            cmd.ExecuteNonQuery();
                        }
                    }
                    cmd.ExecuteNonQuery();
                    tx.Commit();
                    return true;
                }
                catch
                {
                    tx.Rollback();
                    return false;
                }
            }
        }

        #endregion ExecuteNonQuery

        #region ExecuteScalar

        /// <summary>
        /// 執行一條計算查詢結果語句，返回查詢結果（object）。
        /// </summary>
        /// <param name="SQLString">計算查詢結果語句</param>
        /// <returns>查詢結果（object）</returns>
        public static object ExecuteScalar(string SQLString)
        {
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {
                using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        object obj = cmd.ExecuteScalar();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (MySql.Data.MySqlClient.MySqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }

        /// <summary>
        /// 執行一條計算查詢結果語句，返回查詢結果（object）。
        /// </summary>
        /// <param name="SQLString">計算查詢結果語句</param>
        /// <returns>查詢結果（object）</returns>
        public static object ExecuteScalar(string SQLString, params MySqlParameter[] cmdParms)
        {
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {
                using (MySqlCommand cmd = new MySqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        object obj = cmd.ExecuteScalar();
                        cmd.Parameters.Clear();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (MySql.Data.MySqlClient.MySqlException e)
                    {
                        throw e;
                    }
                }
            }
        }

        #endregion ExecuteScalar

        #region ExecuteReader

        /// <summary>
        /// 執行查詢語句，返回MySqlDataReader ( 注意：調用該方法后，一定要對MySqlDataReader進行Close )
        /// </summary>
        /// <param name="strSQL">查詢語句</param>
        /// <returns>MySqlDataReader</returns>
        public static MySqlDataReader ExecuteReader(string strSQL)
        {
            MySqlConnection connection = new MySqlConnection(connectionString);
            MySqlCommand cmd = new MySqlCommand(strSQL, connection);
            try
            {
                connection.Open();
                MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                return myReader;
            }
            catch (MySql.Data.MySqlClient.MySqlException e)
            {
                throw e;
            }
        }

        /// <summary>
        /// 執行查詢語句，返回MySqlDataReader ( 注意：調用該方法后，一定要對MySqlDataReader進行Close )
        /// </summary>
        /// <param name="strSQL">查詢語句</param>
        /// <returns>MySqlDataReader</returns>
        public static MySqlDataReader ExecuteReader(string SQLString, params MySqlParameter[] cmdParms)
        {
            MySqlConnection connection = new MySqlConnection(connectionString);
            MySqlCommand cmd = new MySqlCommand();
            try
            {
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return myReader;
            }
            catch (MySql.Data.MySqlClient.MySqlException e)
            {
                throw e;
            }
            // finally
            // {
            // cmd.Dispose();
            // connection.Close();
            // }
        }

        #endregion ExecuteReader

        #region ExecuteDataTable

        /// <summary>
        /// 執行查詢語句，返回DataTable
        /// </summary>
        /// <param name="SQLString">查詢語句</param>
        /// <returns>DataTable</returns>
        public   DataTable ExecuteDataTable(string SQLString)
        {
            //connectionString = System.Configuration.ConfigurationManager.AppSettings["MySQLconn"];
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
                    command.Fill(ds, "ds");
                }
                catch (MySql.Data.MySqlClient.MySqlException ex)
                {
                    throw new Exception(ex.Message);
                }
                connection.Close();
                return ds.Tables[0];
            }
        }

        #region ExecuteDataTable

        /// <summary>
        /// 執行查詢語句，返回DataTable
        /// </summary>
        /// <param name="db">數據庫類型（Nozzle,Feeder,Head）</param>
        /// <param name="SQLString">查詢語句</param>
        /// <returns>DataTable</returns>
        public static DataTable ExecuteDataTable(string db, string SQLString)
        {
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
                    command.Fill(ds, "ds");
                }
                catch (MySql.Data.MySqlClient.MySqlException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds.Tables[0];
            }
        }

        #endregion ExecuteDataTable

        /// <summary>
        /// 執行查詢語句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查詢語句</param>
        /// <returns>DataTable</returns>
        public static DataTable ExecuteDataTable(string SQLString, params MySqlParameter[] cmdParms)
        {
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {
                MySqlCommand cmd = new MySqlCommand();
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
                {
                    DataSet ds = new DataSet();
                    try
                    {
                        da.Fill(ds, "ds");
                        cmd.Parameters.Clear();
                    }
                    catch (MySql.Data.MySqlClient.MySqlException ex)
                    {
                        throw new Exception(ex.Message);
                    }
                    return ds.Tables[0];
                }
            }
        }

        //獲取起始頁碼和結束頁碼
        public static DataTable ExecuteDataTable(string cmdText, int startResord, int maxRecord)
        {
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    MySqlDataAdapter command = new MySqlDataAdapter(cmdText, connection);
                    command.Fill(ds, startResord, maxRecord, "ds");
                }
                catch (MySql.Data.MySqlClient.MySqlException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds.Tables[0];
            }
        }

        #endregion ExecuteDataTable

        /// <summary>
        /// 獲取分頁數據 在不用存儲過程情況下
        /// </summary>
        /// <param name="recordCount">總記錄條數</param>
        /// <param name="selectList">選擇的列逗號隔開,支持top num</param>
        /// <param name="tableName">表名字</param>
        /// <param name="whereStr">條件字符 必須前加 and</param>
        /// <param name="orderExpression">排序 例如 ID</param>
        /// <param name="pageIdex">當前索引頁</param>
        /// <param name="pageSize">每頁記錄數</param>
        /// <returns></returns>
        public   DataTable getPager(out int recordCount, string selectList, string tableName, string whereStr, string orderExpression, int pageIdex, int pageSize)
        {
            int rows = 0;
            DataTable dt = new DataTable();
            MatchCollection matchs = Regex.Matches(selectList, @"top\s+\d{1,}", RegexOptions.IgnoreCase);//含有top
            string sqlStr = sqlStr = string.Format("select {0} from {1} where 1=1 {2}", selectList, tableName, whereStr);
            if (!string.IsNullOrEmpty(orderExpression)) { sqlStr += string.Format(" Order by {0}", orderExpression); }
            if (matchs.Count > 0) //含有top的時候
            {
                DataTable dtTemp = ExecuteDataTable(sqlStr);
                rows = dtTemp.Rows.Count;
            }
            else //不含有top的時候
            {
                string sqlCount = string.Format("select count(*) from {0} where 1=1 {1} ", tableName, whereStr);
                //獲取行數
                object obj = ExecuteScalar(sqlCount);
                if (obj != null)
                {
                    rows = Convert.ToInt32(obj);
                }
            }
            dt = ExecuteDataTable(sqlStr, (pageIdex - 1) * pageSize, pageSize);
            recordCount = rows;
            return dt;
        }

        #region 創建command

        private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, 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 = CommandType.Text;//cmdType;
            if (cmdParms != null)
            {
                foreach (MySqlParameter parameter in cmdParms)
                {
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
                    (parameter.Value == null))
                    {
                        parameter.Value = DBNull.Value;
                    }
                    cmd.Parameters.Add(parameter);
                }
            }
        }

        #endregion 創建command

    }

調用

 

            MySqlHelper mySqlHelper = new MySqlHelper();
            var DTB = mySqlHelper.ExecuteDataTable("  select * from testDB.t_test");

 

修改版：

 

  /// <summary>
    /// MySql數據庫操作類
    /// </summary>

    public class MySqlHelper
    {
       /// public static string connectionStringMYSQL = System.Configuration.ConfigurationManager.ConnectionStrings["EZRMySQL"].ConnectionString;
        ////存儲過程
        public static DataTable ExecuteDataTableCommand(string CommandText,  string MySQLConStr)
        {
            using (MySqlConnection connection = new MySqlConnection(MySQLConStr))
            {
                MySqlCommand cmd = new MySqlCommand();
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.CommandText = CommandText;
                using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
                {
                    DataSet ds = new DataSet();
                    try
                    {
                        da.Fill(ds, "ds");
                        cmd.Parameters.Clear();
                    }
                    catch (MySql.Data.MySqlClient.MySqlException ex)
                    {
                        throw new Exception(ex.Message);
                    }
                    return ds.Tables[0];
                }
            }
        }

        #region ExecuteNonQuery

        //執行SQL語句，返回影響的記錄數
        /// <summary>
        /// 執行SQL語句，返回影響的記錄數
        /// </summary>
        /// <param name="SQLString">SQL語句</param>
        /// <returns>影響的記錄數</returns>
        public static int ExecuteNonQuery(string SQLString, string MySQLConStr)
        {
            using (MySqlConnection connection = new MySqlConnection(MySQLConStr))
            {
                using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (MySql.Data.MySqlClient.MySqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }

        /// <summary>
        /// 執行SQL語句，返回影響的記錄數
        /// </summary>
        /// <param name="SQLString">SQL語句</param>
        /// <returns>影響的記錄數</returns>
        public static int ExecuteNonQuery(string SQLString, string MySQLConStr, params MySqlParameter[] cmdParms)
        {
            using (MySqlConnection connection = new MySqlConnection(MySQLConStr))
            {
                using (MySqlCommand cmd = new MySqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        int rows = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                        return rows;
                    }
                    catch (MySql.Data.MySqlClient.MySqlException e)
                    {
                        throw e;
                    }
                }
            }
        }

        /// <summary>
        /// 是否存在
        /// </summary>
        /// <param name="strSql"></param>
        /// <returns></returns>
        public static bool Exists(string strSql, string MySQLConStr)
        {
            object obj = GetSingle(strSql,   MySQLConStr);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = 1;
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

        /// <summary>
        /// 執行一條計算查詢結果語句，返回查詢結果（object）。
        /// </summary>
        /// <param name="SQLString">計算查詢結果語句</param>
        /// <returns>查詢結果（object）</returns>
        public static object GetSingle(string SQLString, string MySQLConStr)
        {
            using (MySqlConnection connection = new MySqlConnection(MySQLConStr))
            {
                using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        object obj = cmd.ExecuteScalar();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (MySql.Data.MySqlClient.MySqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }

        public static object GetSingle(string SQLString, int Times, string MySQLConStr)
        {
            using (MySqlConnection connection = new MySqlConnection(MySQLConStr))
            {
                using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        cmd.CommandTimeout = Times;
                        object obj = cmd.ExecuteScalar();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (MySql.Data.MySqlClient.MySqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }

        //執行多條SQL語句，實現數據庫事務。
        /// <summary>
        /// 執行多條SQL語句，實現數據庫事務。
        /// </summary>
        /// <param name="SQLStringList">多條SQL語句</param>
        public static bool ExecuteNoQueryTran(List<String> SQLStringList, string MySQLConStr)
        {
            using (MySqlConnection conn = new MySqlConnection(MySQLConStr))
            {
                conn.Open();
                MySqlCommand cmd = new MySqlCommand();
                cmd.Connection = conn;
                MySqlTransaction tx = conn.BeginTransaction();
                cmd.Transaction = tx;
                try
                {
                    for (int n = 0; n < SQLStringList.Count; n++)
                    {
                        string strsql = SQLStringList[n];
                        if (strsql.Trim().Length > 1)
                        {
                            cmd.CommandText = strsql;
                            PrepareCommand(cmd, conn, tx, strsql, null);
                            cmd.ExecuteNonQuery();
                        }
                    }
                    cmd.ExecuteNonQuery();
                    tx.Commit();
                    return true;
                }
                catch
                {
                    tx.Rollback();
                    return false;
                }
            }
        }

        #endregion ExecuteNonQuery

        #region ExecuteScalar

        /// <summary>
        /// 執行一條計算查詢結果語句，返回查詢結果（object）。
        /// </summary>
        /// <param name="SQLString">計算查詢結果語句</param>
        /// <returns>查詢結果（object）</returns>
        public static object ExecuteScalar(string SQLString, string MySQLConStr)
        {
            using (MySqlConnection connection = new MySqlConnection(MySQLConStr))
            {
                using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        object obj = cmd.ExecuteScalar();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (MySql.Data.MySqlClient.MySqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }

        /// <summary>
        /// 執行一條計算查詢結果語句，返回查詢結果（object）。
        /// </summary>
        /// <param name="SQLString">計算查詢結果語句</param>
        /// <returns>查詢結果（object）</returns>
        public static object ExecuteScalar(string SQLString, string MySQLConStr, params MySqlParameter[] cmdParms)
        {
            using (MySqlConnection connection = new MySqlConnection(MySQLConStr))
            {
                using (MySqlCommand cmd = new MySqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        object obj = cmd.ExecuteScalar();
                        cmd.Parameters.Clear();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (MySql.Data.MySqlClient.MySqlException e)
                    {
                        throw e;
                    }
                }
            }
        }

        #endregion ExecuteScalar

        #region ExecuteReader

        /// <summary>
        /// 執行查詢語句，返回MySqlDataReader ( 注意：調用該方法后，一定要對MySqlDataReader進行Close )
        /// </summary>
        /// <param name="strSQL">查詢語句</param>
        /// <returns>MySqlDataReader</returns>
        public static MySqlDataReader ExecuteReader(string strSQL, string MySQLConStr)
        {
            MySqlConnection connection = new MySqlConnection(MySQLConStr);
            MySqlCommand cmd = new MySqlCommand(strSQL, connection);
            try
            {
                connection.Open();
                MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                return myReader;
            }
            catch (MySql.Data.MySqlClient.MySqlException e)
            {
                throw e;
            }
        }

        /// <summary>
        /// 執行查詢語句，返回MySqlDataReader ( 注意：調用該方法后，一定要對MySqlDataReader進行Close )
        /// </summary>
        /// <param name="strSQL">查詢語句</param>
        /// <returns>MySqlDataReader</returns>
        public static MySqlDataReader ExecuteReader(string SQLString, string MySQLConStr, params MySqlParameter[] cmdParms)
        {
            MySqlConnection connection = new MySqlConnection(MySQLConStr);
            MySqlCommand cmd = new MySqlCommand();
            try
            {
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                MySqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return myReader;
            }
            catch (MySql.Data.MySqlClient.MySqlException e)
            {
                throw e;
            }
            // finally
            // {
            // cmd.Dispose();
            // connection.Close();
            // }
        }

        #endregion ExecuteReader

        #region ExecuteDataTable

        /// <summary>
        /// 執行查詢語句，返回DataTable
        /// </summary>
        /// <param name="SQLString">查詢語句</param>
        /// <returns>DataTable</returns>
        public   DataTable ExecuteDataTable(string SQLString, string MySQLConStr)
        {
       
            using (MySqlConnection connection = new MySqlConnection(MySQLConStr))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
                    command.Fill(ds, "ds");
                }
                catch (MySql.Data.MySqlClient.MySqlException ex)
                {
                    throw new Exception(ex.Message);
                }
                connection.Close();
                return ds.Tables[0];
            }
        }

        #region ExecuteDataTable

        /// <summary>
        /// 執行查詢語句，返回DataTable
        /// </summary>
        /// <param name="db">數據庫類型（Nozzle,Feeder,Head）</param>
        /// <param name="SQLString">查詢語句</param>
        /// <returns>DataTable</returns>
        public static DataTable ExecuteDataTableSta(string db, string MySQLConStr)
        {
            using (MySqlConnection connection = new MySqlConnection(MySQLConStr))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    MySqlDataAdapter command = new MySqlDataAdapter(MySQLConStr, connection);
                    command.Fill(ds, "ds");
                }
                catch (MySql.Data.MySqlClient.MySqlException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds.Tables[0];
            }
        }

        #endregion ExecuteDataTable

        /// <summary>
        /// 執行查詢語句，返回DataSet
        /// </summary>
        /// <param name="SQLString">查詢語句</param>
        /// <returns>DataTable</returns>
        public static DataTable ExecuteDataTable(string SQLString, string MySQLConStr, params MySqlParameter[] cmdParms)
        {
            using (MySqlConnection connection = new MySqlConnection(MySQLConStr))
            {
                MySqlCommand cmd = new MySqlCommand();
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                using (MySqlDataAdapter da = new MySqlDataAdapter(cmd))
                {
                    DataSet ds = new DataSet();
                    try
                    {
                        da.Fill(ds, "ds");
                        cmd.Parameters.Clear();
                    }
                    catch (MySql.Data.MySqlClient.MySqlException ex)
                    {
                        throw new Exception(ex.Message);
                    }
                    return ds.Tables[0];
                }
            }
        }

        //獲取起始頁碼和結束頁碼
        public static DataTable ExecuteDataTable(string cmdText, int startResord, int maxRecord, string MySQLConStr)
        {
            using (MySqlConnection connection = new MySqlConnection(MySQLConStr))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    MySqlDataAdapter command = new MySqlDataAdapter(cmdText, connection);
                    command.Fill(ds, startResord, maxRecord, "ds");
                }
                catch (MySql.Data.MySqlClient.MySqlException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds.Tables[0];
            }
        }

        #endregion ExecuteDataTable

        /// <summary>
        /// 獲取分頁數據 在不用存儲過程情況下
        /// </summary>
        /// <param name="recordCount">總記錄條數</param>
        /// <param name="selectList">選擇的列逗號隔開,支持top num</param>
        /// <param name="tableName">表名字</param>
        /// <param name="whereStr">條件字符 必須前加 and</param>
        /// <param name="orderExpression">排序 例如 ID</param>
        /// <param name="pageIdex">當前索引頁</param>
        /// <param name="pageSize">每頁記錄數</param>
        /// <returns></returns>
        public   DataTable getPager(out int recordCount, string selectList, string tableName, string whereStr, string orderExpression, int pageIdex, int pageSize, string MySQLConStr)
        {
            int rows = 0;
            DataTable dt = new DataTable();
            MatchCollection matchs = Regex.Matches(selectList, @"top\s+\d{1,}", RegexOptions.IgnoreCase);//含有top
            string sqlStr = sqlStr = string.Format("select {0} from {1} where 1=1 {2}", selectList, tableName, whereStr);
            if (!string.IsNullOrEmpty(orderExpression)) { sqlStr += string.Format(" Order by {0}", orderExpression); }
            if (matchs.Count > 0) //含有top的時候
            {
                DataTable dtTemp = ExecuteDataTable(sqlStr,   MySQLConStr);
                rows = dtTemp.Rows.Count;
            }
            else //不含有top的時候
            {
                string sqlCount = string.Format("select count(*) from {0} where 1=1 {1} ", tableName, whereStr);
                //獲取行數
                object obj = ExecuteScalar(sqlCount, MySQLConStr);
                if (obj != null)
                {
                    rows = Convert.ToInt32(obj);
                }
            }
            dt = ExecuteDataTable(sqlStr, (pageIdex - 1) * pageSize, pageSize, MySQLConStr);
            recordCount = rows;
            return dt;
        }

        #region 創建command

        private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, 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 = CommandType.Text;//cmdType;
            if (cmdParms != null)
            {
                foreach (MySqlParameter parameter in cmdParms)
                {
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) &&
                    (parameter.Value == null))
                    {
                        parameter.Value = DBNull.Value;
                    }
                    cmd.Parameters.Add(parameter);
                }
            }
        }

        #endregion 創建command

    }

調用：

 

 MySqlHelper mySqlHelper = new MySqlHelper();
            var DTB = mySqlHelper.ExecuteDataTable("  select   * from TTT  where OldCodeStatus=1 and LastUpdateDate>=curdate() ", ConString);