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c# 向MySQL添加数据的两种方法

C#/.NET问题
2023-04-05

这篇文章主要介绍了c# 向MySQL添加数据的两种方法，帮助大家更好的理解和学习使用c#，感兴趣的朋友可以了解下

       下面介绍两种执行SQL命令的方法，并作出相应地总结，第一种介绍一种常规用法，下面进行做简要地分析，首先我们需要执行打开数据库操作首先创建一个MySqlConnection对象，在其构造函数中传入一个连接字符串，然后执行Open操作打开数据库，在正确打开数据库之后我们才能进行相关的动作，在ExecuteSQL这个函数中，

     我们执行MySqlCommand myCmd = new MySqlCommand(CmdString, conn)，从而创建MySqlCommand对象，其中传入的两个参数分别为sql命令和第一步建立的MySqlConnection对象，然后执行int Cmd = myCmd.ExecuteNonQuery()这一句执行相应的命令，并返回受影响的行数，最后我们需要关闭数据库连接，并释放非托管资源，从而完成整个数据库操作的过程;这个是比较常规的一种做法，也是我们使用比较多的一种形式。


public class DataBaseMySqlHelper
{
    string connstr;
    MySqlConnection conn;
    //Server=xxxxxxx;Database=xxxxxxx;Uid=xxxxxxx;Pwd=xxxxxxx;CharSet=gbk;
    //Server=xxx.xx.xxx.xx;Database=MSUP;Uid=dvision;Pwd=dvision;Port=xxxx;allow zero datetime = true;
    MainWindow _MainWindow;
 
 
    public DataBaseMySqlHelper(MainWindow mainWindow)
    {
        _MainWindow = mainWindow;
         connstr = _MainWindow._ConfigInfo.MySqlConnectionStrings;        
    }
 
    public DataBaseMySqlHelper(MainWindow mainWindow, string connectionString)
    {
        _MainWindow = mainWindow;
        connstr = connectionString;
    }
 
    /// <summary>
    /// 打开数据库连接
    /// </summary>
    void Open()
    {
        try
        {
            conn = new MySqlConnection(connstr);
            conn.Open();
        }
        catch (Exception ex)
        {
 
            System.Windows.Forms.MessageBox.Show(ex.Message);
        }
         
    }
    /// <summary>
    /// 关闭数据库连接
    /// </summary>
    void Close()
    {
        conn.Close();
    }
 
    /// <summary>
    /// 返回影响数据库的行数            
    /// </summary>
    /// <param name="CmdString"></param>
    /// <returns></returns>
    public int ExecuteSQL(string CmdString)
    {
        try
        {
            Open();
            MySqlCommand myCmd = new MySqlCommand(CmdString, conn);
            int Cmd = myCmd.ExecuteNonQuery();
            Close();
            return Cmd;
        }
        catch (Exception ex)
        {
            _MainWindow.ShowErrorMessage(" MySql数据库查询失败!");
            return 0;
        }
    }
 
    /// <summary>
    /// 返回数据表
    /// </summary>
    /// <param name="CmdString"></param>
    /// <returns></returns>
    public DataTable GetDataTable(string CmdString)
    {
        try
        {
            Open();
            DataSet myDs = new DataSet();
            MySqlDataAdapter myDa = new MySqlDataAdapter();
            myDa.SelectCommand = new MySqlCommand(CmdString, conn);
            myDa.Fill(myDs);
            Close();
            return myDs.Tables[0];
        }
        catch (Exception e)
        {
            _MainWindow.ShowErrorMessage(" MySql数据库查询失败!");
            return null;
        }
    }
}

   第二种方式，这里也贴出关键代码并做简要的分析：这里的关键是MySqlParameter[]数组的使用，我们在执行SQL语句的时候 DbHelperMySQL.ExecuteSql(strSql.ToString(),parameters);这里的parameters就是MySqlParameter[]数组，里面存储的是每个字段的数据，我们将在下面的代码中展示parameters的内容，


/// <summary>
        /// 增加一条数据
        /// </summary>
        public void Add(Maticsoft.Model.cameradetail model)
        {
            StringBuilder strSql=new StringBuilder();
            strSql.Append("insert into cameradetail_gis(");
            strSql.Append("EncodeDeviceUsername,MatrixIP,EncodeDevicePassword,id,Name,DisplayName,Location,Longitude,Latitude,CameraActive,ServerID,ForwardSvrIP,ForwardSvrPort,EncodeDeviceIP,EncodeDevicePort,CameraType,CameraModel,DeviceChannel,MatrixPort,MatrixChannelNum,VideoStoreServerIP,VideoStoreServerPort,VideoStoreServerUserID,VideoStoreServerPassword,EncodeDeviceModelNum,EncodeDeviceModelName,CameraInstallAddress,CameraStatus)");
            strSql.Append(" values (");
            strSql.Append("@EncodeDeviceUsername,@MatrixIP,@EncodeDevicePassword,@id,@Name,@DisplayName,@Location,@Longitude,@Latitude,@CameraActive,@ServerID,@ForwardSvrIP,@ForwardSvrPort,@EncodeDeviceIP,@EncodeDevicePort,@CameraType,@CameraModel,@DeviceChannel,@MatrixPort,@MatrixChannelNum,@VideoStoreServerIP,@VideoStoreServerPort,@VideoStoreServerUserID,@VideoStoreServerPassword,@EncodeDeviceModelNum,@EncodeDeviceModelName,@CameraInstallAddress,@CameraStatus)");
            MySqlParameter[] parameters = {
                    new MySqlParameter("@EncodeDeviceUsername", MySqlDbType.VarChar,64),
                    new MySqlParameter("@MatrixIP", MySqlDbType.VarChar,16),
                    new MySqlParameter("@EncodeDevicePassword", MySqlDbType.VarChar,64),
                    new MySqlParameter("@id", MySqlDbType.VarChar,14),
                    new MySqlParameter("@Name", MySqlDbType.VarChar,100),
                    new MySqlParameter("@DisplayName", MySqlDbType.VarChar,100),
                    new MySqlParameter("@Location", MySqlDbType.VarChar,250),
                    new MySqlParameter("@Longitude", MySqlDbType.VarChar,16),
                    new MySqlParameter("@Latitude", MySqlDbType.VarChar,16),
                    new MySqlParameter("@CameraActive", MySqlDbType.Int32,11),
                    new MySqlParameter("@ServerID", MySqlDbType.VarChar,16),
                    new MySqlParameter("@ForwardSvrIP", MySqlDbType.VarChar,16),
                    new MySqlParameter("@ForwardSvrPort", MySqlDbType.VarChar,16),
                    new MySqlParameter("@EncodeDeviceIP", MySqlDbType.VarChar,16),
                    new MySqlParameter("@EncodeDevicePort", MySqlDbType.VarChar,6),
                    new MySqlParameter("@CameraType", MySqlDbType.VarChar,6),
                    new MySqlParameter("@CameraModel", MySqlDbType.VarChar,6),
                    new MySqlParameter("@DeviceChannel", MySqlDbType.VarChar,12),
                    new MySqlParameter("@MatrixPort", MySqlDbType.VarChar,6),
                    new MySqlParameter("@MatrixChannelNum", MySqlDbType.VarChar,14),
                    new MySqlParameter("@VideoStoreServerIP", MySqlDbType.VarChar,16),
                    new MySqlParameter("@VideoStoreServerPort", MySqlDbType.VarChar,6),
                    new MySqlParameter("@VideoStoreServerUserID", MySqlDbType.VarChar,50),
                    new MySqlParameter("@VideoStoreServerPassword", MySqlDbType.VarChar,20),
                    new MySqlParameter("@EncodeDeviceModelNum", MySqlDbType.VarChar,6),
                    new MySqlParameter("@EncodeDeviceModelName", MySqlDbType.VarChar,50),
                    new MySqlParameter("@CameraInstallAddress", MySqlDbType.VarChar,250),
                    new MySqlParameter("@CameraStatus", MySqlDbType.Int32,11)};
            parameters[0].Value = model.EncodeDeviceUsername;
            parameters[1].Value = model.MatrixIP;
            parameters[2].Value = model.EncodeDevicePassword;
            parameters[3].Value = model.id;
            parameters[4].Value = model.Name;
            parameters[5].Value = model.DisplayName;
            parameters[6].Value = model.Location;
            parameters[7].Value = model.Longitude;
            parameters[8].Value = model.Latitude;
            parameters[9].Value = model.CameraActive;
            parameters[10].Value = model.ServerID;
            parameters[11].Value = model.ForwardSvrIP;
            parameters[12].Value = model.ForwardSvrPort;
            parameters[13].Value = model.EncodeDeviceIP;
            parameters[14].Value = model.EncodeDevicePort;
            parameters[15].Value = model.CameraType;
            parameters[16].Value = model.CameraModel;
            parameters[17].Value = model.DeviceChannel;
            parameters[18].Value = model.MatrixPort;
            parameters[19].Value = model.MatrixChannelNum;
            parameters[20].Value = model.VideoStoreServerIP;
            parameters[21].Value = model.VideoStoreServerPort;
            parameters[22].Value = model.VideoStoreServerUserID;
            parameters[23].Value = model.VideoStoreServerPassword;
            parameters[24].Value = model.EncodeDeviceModelNum;
            parameters[25].Value = model.EncodeDeviceModelName;
            parameters[26].Value = model.CameraInstallAddress;
            parameters[27].Value = model.CameraStatus;
 
            DbHelperMySQL.ExecuteSql(strSql.ToString(),parameters);
        }

 这里我们重点来关注DbHelperMySQL.ExecuteSql(strSql.ToString(),parameters)这个函数，函数的源码如下：

     这里面有一个重要的函数PrepareCommand(cmd, connection, null, SQLString, cmdParms)，我们这里也贴出相应地源码，并做简要的分析：

   这个函数首先是打开数据库连接，这里面最重要就是讲cmdParms里面的参数一个个添加到cmd.Parameters中，然后执行 int rows = cmd.ExecuteNonQuery();命令来执行相应的操作，这是一种决然不同的思路，我们在使用的时候可以考虑这两种方式来进行数据库的插入操作！


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

/// <summary>
        /// 执行SQL语句，返回影响的记录数
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSql(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;
                    }
                }
            }
        }

#region  执行简单SQL语句
 
     /// <summary>
     /// 执行SQL语句，返回影响的记录数
     /// </summary>
     /// <param name="SQLString">SQL语句</param>
     /// <returns>影响的记录数</returns>
     public static int ExecuteSql(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;
                 }
             }
         }
     }
 
     public static int ExecuteSqlByTime(string SQLString, int Times)
     {
         using (MySqlConnection connection = new MySqlConnection(connectionString))
         {
             using (MySqlCommand cmd = new MySqlCommand(SQLString, connection))
             {
                 try
                 {
                     connection.Open();
                     cmd.CommandTimeout = Times;
                     int rows = cmd.ExecuteNonQuery();
                     return rows;
                 }
                 catch (MySql.Data.MySqlClient.MySqlException e)
                 {
                     connection.Close();
                     throw e;
                 }
             }
         }
     }
    
     /// <summary>
     /// 执行MySql和Oracle滴混合事务
     /// </summary>
     /// <param name="list">SQL命令行列表</param>
     /// <param name="oracleCmdSqlList">Oracle命令行列表</param>
     /// <returns>执行结果 0-由于SQL造成事务失败 -1 由于Oracle造成事务失败 1-整体事务执行成功</returns>
     public static int ExecuteSqlTran(List<CommandInfo> list, List<CommandInfo> oracleCmdSqlList)
     {
         using (MySqlConnection conn = new MySqlConnection(connectionString))
         {
             conn.Open();
             MySqlCommand cmd = new MySqlCommand();
             cmd.Connection = conn;
             MySqlTransaction tx = conn.BeginTransaction();
             cmd.Transaction = tx;
             try
             {
                 foreach (CommandInfo myDE in list)
                 {
                     string cmdText = myDE.CommandText;
                     MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Parameters;
                     PrepareCommand(cmd, conn, tx, cmdText, cmdParms);
                     if (myDE.EffentNextType == EffentNextType.SolicitationEvent)
                     {
                         if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
                         {
                             tx.Rollback();
                             throw new Exception("违背要求"+myDE.CommandText+"必须符合select count(..的格式");
                             //return 0;
                         }
                         object obj = cmd.ExecuteScalar();
                         bool isHave = false;
                         if (obj == null && obj == DBNull.Value)
                         {
                             isHave = false;
                         }
                         isHave = Convert.ToInt32(obj) > 0;
                         if (isHave)
                         {
                             //引发事件
                             myDE.OnSolicitationEvent();
                         }
                     }
                     if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
                     {
                         if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
                         {
                             tx.Rollback();
                             throw new Exception("SQL:违背要求" + myDE.CommandText + "必须符合select count(..的格式");
                             //return 0;
                         }
 
                         object obj = cmd.ExecuteScalar();
                         bool isHave = false;
                         if (obj == null && obj == DBNull.Value)
                         {
                             isHave = false;
                         }
                         isHave = Convert.ToInt32(obj) > 0;
 
                         if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
                         {
                             tx.Rollback();
                             throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须大于0");
                             //return 0;
                         }
                         if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
                         {
                             tx.Rollback();
                             throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须等于0");
                             //return 0;
                         }
                         continue;
                     }
                     int val = cmd.ExecuteNonQuery();
                     if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)
                     {
                         tx.Rollback();
                         throw new Exception("SQL:违背要求" + myDE.CommandText + "必须有影响行");
                         //return 0;
                     }
                     cmd.Parameters.Clear();
                 }
                 string oraConnectionString = PubConstant.GetConnectionString("ConnectionStringPPC");
                 bool res = OracleHelper.ExecuteSqlTran(oraConnectionString, oracleCmdSqlList);
                 if (!res)
                 {
                     tx.Rollback();
                     throw new Exception("执行失败");
                     // return -1;
                 }
                 tx.Commit();
                 return 1;
             }
             catch (MySql.Data.MySqlClient.MySqlException e)
             {
                 tx.Rollback();
                 throw e;
             }
             catch (Exception e)
             {
                 tx.Rollback();
                 throw e;
             }
         }
     }       
     /// <summary>
     /// 执行多条SQL语句，实现数据库事务。
     /// </summary>
     /// <param name="SQLStringList">多条SQL语句</param>    
     public static int ExecuteSqlTran(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
             {
                 int count = 0;
                 for (int n = 0; n < SQLStringList.Count; n++)
                 {
                     string strsql = SQLStringList[n];
                     if (strsql.Trim().Length > 1)
                     {
                         cmd.CommandText = strsql;
                         count += cmd.ExecuteNonQuery();
                     }
                 }
                 tx.Commit();
                 return count;
             }
             catch
             {
                 tx.Rollback();
                 return 0;
             }
         }
     }
 
     /// <summary>
     /// 执行带一个存储过程参数的的SQL语句。
     /// </summary>
     /// <param name="SQLString">SQL语句</param>
     /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
     /// <returns>影响的记录数</returns>
     public static int ExecuteSql(string SQLString, string content)
     {
         using (MySqlConnection connection = new MySqlConnection(connectionString))
         {
             MySqlCommand cmd = new MySqlCommand(SQLString, connection);
             MySql.Data.MySqlClient.MySqlParameter myParameter = new MySql.Data.MySqlClient.MySqlParameter("@content", SqlDbType.NText);
             myParameter.Value = content;
             cmd.Parameters.Add(myParameter);
             try
             {
                 connection.Open();
                 int rows = cmd.ExecuteNonQuery();
                 return rows;
             }
             catch (MySql.Data.MySqlClient.MySqlException e)
             {
                 throw e;
             }
             finally
             {
                 cmd.Dispose();
                 connection.Close();
             }
         }
     }
     /// <summary>
     /// 执行带一个存储过程参数的的SQL语句。
     /// </summary>
     /// <param name="SQLString">SQL语句</param>
     /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param>
     /// <returns>影响的记录数</returns>
     public static object ExecuteSqlGet(string SQLString, string content)
     {
         using (MySqlConnection connection = new MySqlConnection(connectionString))
         {
             MySqlCommand cmd = new MySqlCommand(SQLString, connection);
             MySql.Data.MySqlClient.MySqlParameter myParameter = new MySql.Data.MySqlClient.MySqlParameter("@content", SqlDbType.NText);
             myParameter.Value = content;
             cmd.Parameters.Add(myParameter);
             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)
             {
                 throw e;
             }
             finally
             {
                 cmd.Dispose();
                 connection.Close();
             }
         }
     }
     /// <summary>
     /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
     /// </summary>
     /// <param name="strSQL">SQL语句</param>
     /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>
     /// <returns>影响的记录数</returns>
     public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
     {
         using (MySqlConnection connection = new MySqlConnection(connectionString))
         {
             MySqlCommand cmd = new MySqlCommand(strSQL, connection);
             MySql.Data.MySqlClient.MySqlParameter myParameter = new MySql.Data.MySqlClient.MySqlParameter("@fs", SqlDbType.Image);
             myParameter.Value = fs;
             cmd.Parameters.Add(myParameter);
             try
             {
                 connection.Open();
                 int rows = cmd.ExecuteNonQuery();
                 return rows;
             }
             catch (MySql.Data.MySqlClient.MySqlException e)
             {
                 throw e;
             }
             finally
             {
                 cmd.Dispose();
                 connection.Close();
             }
         }
     }
 
     /// <summary>
     ///执行一条计算查询结果语句，返回查询结果(object)。
     /// </summary>
     ///<param name="SQLString">计算查询结果语句</param>
     ///<returns>查询结果（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;
                 }
             }
         }
     }
     /// <summary>
     /// 执行查询语句，返回MySqlDataReader ( 注意：调用该方法后，一定要对MySqlDataReader进行Close )
     /// </summary>
     /// <param name="strSQL">查询语句</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>
     /// 执行查询语句，返回DataSet
     /// </summary>
     /// <param name="SQLString">查询语句</param>
     /// <returns>DataSet</returns>
     public static DataSet Query(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;
         }
     }
     public static DataSet Query(string SQLString, int Times)
     {
         using (MySqlConnection connection = new MySqlConnection(connectionString))
         {
             DataSet ds = new DataSet();
             try
             {
                 connection.Open();
                 MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection);
                 command.SelectCommand.CommandTimeout = Times;
                 command.Fill(ds, "ds");
             }
             catch (MySql.Data.MySqlClient.MySqlException ex)
             {
                 throw new Exception(ex.Message);
             }
             return ds;
         }
     }
 
 
 
     #endregion
 
     #region 执行带参数的SQL语句
 
     /// <summary>
     /// 执行SQL语句，返回影响的记录数
     /// </summary>
     /// <param name="SQLString">SQL语句</param>
     /// <returns>影响的记录数</returns>
     public static int ExecuteSql(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>
     /// 执行多条SQL语句，实现数据库事务。
     /// </summary>
     /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的MySqlParameter[]）</param>
     public static void ExecuteSqlTran(Hashtable SQLStringList)
     {
         using (MySqlConnection conn = new MySqlConnection(connectionString))
         {
             conn.Open();
             using (MySqlTransaction trans = conn.BeginTransaction())
             {
                 MySqlCommand cmd = new MySqlCommand();
                 try
                 {
                     //循环
                     foreach (DictionaryEntry myDE in SQLStringList)
                     {
                         string cmdText = myDE.Key.ToString();
                         MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Value;
                         PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                         int val = cmd.ExecuteNonQuery();
                         cmd.Parameters.Clear();
                     }
                     trans.Commit();
                 }
                 catch
                 {
                     trans.Rollback();
                     throw;
                 }
             }
         }
     }
     /// <summary>
     /// 执行多条SQL语句，实现数据库事务。
     /// </summary>
     /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的MySqlParameter[]）</param>
     public static int ExecuteSqlTran(System.Collections.Generic.List<CommandInfo> cmdList)
     {
         using (MySqlConnection conn = new MySqlConnection(connectionString))
         {
             conn.Open();
             using (MySqlTransaction trans = conn.BeginTransaction())
             {
                 MySqlCommand cmd = new MySqlCommand();
                 try
                 { int count = 0;
                     //循环
                     foreach (CommandInfo myDE in cmdList)
                     {
                         string cmdText = myDE.CommandText;
                         MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Parameters;
                         PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                         
                         if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
                         {
                             if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
                             {
                                 trans.Rollback();
                                 return 0;
                             }
 
                             object obj = cmd.ExecuteScalar();
                             bool isHave = false;
                             if (obj == null && obj == DBNull.Value)
                             {
                                 isHave = false;
                             }
                             isHave = Convert.ToInt32(obj) > 0;
 
                             if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
                             {
                                 trans.Rollback();
                                 return 0;
                             }
                             if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
                             {
                                 trans.Rollback();
                                 return 0;
                             }
                             continue;
                         }
                         int val = cmd.ExecuteNonQuery();
                         count += val;
                         if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)
                         {
                             trans.Rollback();
                             return 0;
                         }
                         cmd.Parameters.Clear();
                     }
                     trans.Commit();
                     return count;
                 }
                 catch
                 {
                     trans.Rollback();
                     throw;
                 }
             }
         }
     }
     /// <summary>
     /// 执行多条SQL语句，实现数据库事务。
     /// </summary>
     /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的MySqlParameter[]）</param>
     public static void ExecuteSqlTranWithIndentity(System.Collections.Generic.List<CommandInfo> SQLStringList)
     {
         using (MySqlConnection conn = new MySqlConnection(connectionString))
         {
             conn.Open();
             using (MySqlTransaction trans = conn.BeginTransaction())
             {
                 MySqlCommand cmd = new MySqlCommand();
                 try
                 {
                     int indentity = 0;
                     //循环
                     foreach (CommandInfo myDE in SQLStringList)
                     {
                         string cmdText = myDE.CommandText;
                         MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Parameters;
                         foreach (MySqlParameter q in cmdParms)
                         {
                             if (q.Direction == ParameterDirection.InputOutput)
                             {
                                 q.Value = indentity;
                             }
                         }
                         PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                         int val = cmd.ExecuteNonQuery();
                         foreach (MySqlParameter q in cmdParms)
                         {
                             if (q.Direction == ParameterDirection.Output)
                             {
                                 indentity = Convert.ToInt32(q.Value);
                             }
                         }
                         cmd.Parameters.Clear();
                     }
                     trans.Commit();
                 }
                 catch
                 {
                     trans.Rollback();
                     throw;
                 }
             }
         }
     }
     /// <summary>
     /// 执行多条SQL语句，实现数据库事务。
     /// </summary>
     /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的MySqlParameter[]）</param>
     public static void ExecuteSqlTranWithIndentity(Hashtable SQLStringList)
     {
         using (MySqlConnection conn = new MySqlConnection(connectionString))
         {
             conn.Open();
             using (MySqlTransaction trans = conn.BeginTransaction())
             {
                 MySqlCommand cmd = new MySqlCommand();
                 try
                 {
                     int indentity = 0;
                     //循环
                     foreach (DictionaryEntry myDE in SQLStringList)
                     {
                         string cmdText = myDE.Key.ToString();
                         MySqlParameter[] cmdParms = (MySqlParameter[])myDE.Value;
                         foreach (MySqlParameter q in cmdParms)
                         {
                             if (q.Direction == ParameterDirection.InputOutput)
                             {
                                 q.Value = indentity;
                             }
                         }
                         PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                         int val = cmd.ExecuteNonQuery();
                         foreach (MySqlParameter q in cmdParms)
                         {
                             if (q.Direction == ParameterDirection.Output)
                             {
                                 indentity = Convert.ToInt32(q.Value);
                             }
                         }
                         cmd.Parameters.Clear();
                     }
                     trans.Commit();
                 }
                 catch
                 {
                     trans.Rollback();
                     throw;
                 }
             }
         }
     }
     /// <summary>
     /// 执行一条计算查询结果语句，返回查询结果（object）。
     /// </summary>
     /// <param name="SQLString">计算查询结果语句</param>
     /// <returns>查询结果（object）</returns>
     public static object GetSingle(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;
                 }
             }
         }
     }
 
     /// <summary>
     /// 执行查询语句，返回MySqlDataReader ( 注意：调用该方法后，一定要对MySqlDataReader进行Close )
     /// </summary>
     /// <param name="strSQL">查询语句</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();
         //          }  
 
     }
 
     /// <summary>
     /// 执行查询语句，返回DataSet
     /// </summary>
     /// <param name="SQLString">查询语句</param>
     /// <returns>DataSet</returns>
     public static DataSet Query(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;
             }
         }
     }
 
 
     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
 }

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