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。
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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,
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/// <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!
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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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/// <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; } } } } |
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#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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原文链接:https://www.cnblogs.com/seekdream/p/4680831.html