c# 向MySQL添加数据的两种方法

       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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