OracleHelper：
//Oracle连接字符串：
<connectionStrings>
<add name="OracleConnection" connectionString="Password=***;User ID=***;Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.**.**)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=ORCL)));" providerName="Oracle.ManagedDataAccess.Client;provider" />
</connectionStrings>
public static class OracleHelper { //数据库连接字符串(web.config来配置) public static string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["OracleConnection"].ToString(); #region 检查是否存在 /// <summary> /// 检查是否存在，存在返回true，不存在返回false /// </summary> /// <param name="strSql"></param> /// <returns></returns> public static bool Exists(string strSql) { using (OracleConnection connection = new OracleConnection(connectionString)) { connection.Open(); OracleCommand myCmd = new OracleCommand(strSql, connection); try { object obj = myCmd.ExecuteScalar(); //返回结果的第一行一列 myCmd.Parameters.Clear(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return false; } else { return true; } } catch (Exception ex) { throw ex; } } } #endregion #region 执行简单SQL语句 返回影响的记录数 /// <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) { OracleConnection connection = null; OracleCommand cmd = null; try { connection = new OracleConnection(connectionString); cmd = new OracleCommand(SQLString, connection); connection.Open(); int rows = cmd.ExecuteNonQuery(); return rows; } finally { if (cmd != null) { cmd.Dispose(); } if (connection != null) { connection.Close(); connection.Dispose(); } } } #endregion #region 执行查询语句，返回SqlDataReader /// <summary> /// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close ) /// </summary> /// <param name="strSQL">查询语句</param> /// <returns>SqlDataReader</returns> public static OracleDataReader ExecuteReader(string strSQL) { OracleConnection connection = new OracleConnection(connectionString); OracleCommand cmd = new OracleCommand(strSQL, connection); try { connection.Open(); OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection); return myReader; } catch (OracleException e) { throw e; } finally { connection.Close(); } } #endregion #region 执行SQL查询语句，返回DataTable数据表 /// <summary> /// 执行SQL查询语句 /// </summary> /// <param name="sqlStr"></param> /// <returns>返回DataTable数据表</returns> public static DataTable GetDataTable(string sqlStr) { OracleConnection mycon = new OracleConnection(connectionString); OracleCommand mycmd = new OracleCommand(sqlStr, mycon); DataTable dt = new DataTable(); OracleDataAdapter da = null; try { mycon.Open(); da = new OracleDataAdapter(sqlStr, mycon); da.Fill(dt); } catch (Exception ex) { throw new Exception(ex.ToString()); } finally { mycon.Close(); } return dt; } /// <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 QueryDs(string SQLString) { using (OracleConnection connection = new OracleConnection(connectionString)) { DataSet ds = new DataSet(); try { connection.Open(); OracleDataAdapter command = new OracleDataAdapter(SQLString, connection); command.Fill(ds, "ds"); } catch (System.Data.OracleClient.OracleException ex) { throw new Exception(ex.Message); } return ds; } } #endregion #region 存储过程操作 /// <summary> /// 运行存储过程,返回datatable; /// </summary> /// <param name="storedProcName">存储过程名称</param> /// <param name="parameters">参数</param> /// <returns></returns> public static DataTable RunProcedureDatatable(string storedProcName, IDataParameter[] parameters) { using (OracleConnection connection = new OracleConnection(connectionString)) { DataSet ds = new DataSet(); connection.Open(); OracleDataAdapter sqlDA = new OracleDataAdapter(); sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters); sqlDA.Fill(ds); connection.Close(); return ds.Tables[0]; } } /// <summary> /// 执行存储过程 /// </summary> /// <param name="storedProcName">存储过程名称</param> /// <param name="parameters">参数</param> /// <returns></returns> public static int RunProcedure(string storedProcName, IDataParameter[] parameters) { using (OracleConnection connection = new OracleConnection(connectionString)) { try { connection.Open(); OracleCommand command = new OracleCommand(storedProcName, connection); command.CommandType = CommandType.StoredProcedure; foreach (OracleParameter parameter in parameters) { if (parameter != null) { // 检查未分配值的输出参数,将其分配以DBNull.Value. if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) && (parameter.Value == null)) { parameter.Value = DBNull.Value; } command.Parameters.Add(parameter); } } int rows = command.ExecuteNonQuery(); return rows; } finally { connection.Close(); } } } /// <summary> /// 构建 OracleCommand 对象(用来返回一个结果集，而不是一个整数值) /// </summary> /// <param name="connection">数据库连接</param> /// <param name="storedProcName">存储过程名</param> /// <param name="parameters">存储过程参数</param> /// <returns>OracleCommand</returns> private static OracleCommand BuildQueryCommand(OracleConnection connection, string storedProcName, IDataParameter[] parameters) { OracleCommand command = new OracleCommand(storedProcName, connection); command.CommandType = CommandType.StoredProcedure; foreach (OracleParameter parameter in parameters) { if (parameter != null) { // 检查未分配值的输出参数,将其分配以DBNull.Value. if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) && (parameter.Value == null)) { parameter.Value = DBNull.Value; } command.Parameters.Add(parameter); } } return command; } #endregion #region 事务处理 /// <summary> /// 执行多条SQL语句(list的形式)，实现数据库事务。 /// </summary> /// <param name="SQLStringList">多条SQL语句</param> /// 调用 Transaction 对象的 Commit 方法来完成事务，或调用 Rollback 方法来取消事务。 public static int ExecuteSqlTran(List<String> SQLStringList) { using (OracleConnection connection = new OracleConnection(connectionString)) { connection.Open(); // 为事务创建一个命令 OracleCommand cmd = new OracleCommand(); cmd.Connection = connection; OracleTransaction tx = connection.BeginTransaction();// 启动一个事务 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();//用Commit方法来完成事务 return count;// } catch { tx.Rollback();//出现错误，事务回滚！ return 0; } finally { cmd.Dispose(); connection.Close();//关闭连接 } } } #endregion #region 事务处理 /// <summary> /// 执行多条SQL语句(字符串数组形式)，实现数据库事务。 /// </summary> /// <param name="SQLStringList">多条SQL语句</param> /// 调用 Transaction 对象的 Commit 方法来完成事务，或调用 Rollback 方法来取消事务。 public static int ExecuteTransaction(string[] SQLStringList, int p) { using (OracleConnection connection = new OracleConnection(connectionString)) { connection.Open(); // 为事务创建一个命令 OracleCommand cmd = new OracleCommand(); cmd.Connection = connection; OracleTransaction tx = connection.BeginTransaction();// 启动一个事务 cmd.Transaction = tx; try { int count = 0; for (int n = 0; n < p; n++) { string strsql = SQLStringList[n]; if (strsql.Trim().Length > 1) { cmd.CommandText = strsql; count += cmd.ExecuteNonQuery(); } } tx.Commit();//用Commit方法来完成事务 return count;// } catch { tx.Rollback();//出现错误，事务回滚！ return 0; } finally { cmd.Dispose(); connection.Close();//关闭连接 } } } #endregion }
MySQLHelper：
//MySQL连接字符串
<appSettings>
<add key="ConnectionString" value="Server=192.168.**.**;Database=smbcore;Uid=root;Pwd=root;CharSet=utf8"/>
</appSettings>
public class MySQLHelper { //数据库连接字符串(web.config来配置) public static string connectionString = ConfigurationManager.AppSettings["ConnectionString"]; #region 公用方法 /// <summary> /// 得到最大值 /// </summary> /// <param name="FieldName"></param> /// <param name="TableName"></param> /// <returns></returns> public static int GetMaxID(string FieldName, string TableName) { string strsql = "select max(" + FieldName + ")+1 from " + TableName; object obj = GetSingle(strsql); if (obj == null) { return 1; } else { return int.Parse(obj.ToString()); } } /// <summary> /// 是否存在 /// </summary> /// <param name="strSql"></param> /// <returns></returns> public static bool Exists(string strSql) { object obj = GetSingle(strSql); int cmdresult; if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { cmdresult = 0; } else { cmdresult = int.Parse(obj.ToString()); } if (cmdresult == 0) { return false; } else { return true; } } /// <summary> /// 是否存在（基于MySqlParameter） /// </summary> /// <param name="strSql"></param> /// <param name="cmdParms"></param> /// <returns></returns> public static bool Exists(string strSql, params MySqlParameter[] cmdParms) { object obj = GetSingle(strSql, cmdParms); int cmdresult; if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { cmdresult = 0; } else { cmdresult = int.Parse(obj.ToString()); } if (cmdresult == 0) { return false; } else { return true; } } #endregion #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; } } /// <summary> /// 执行查询语句，返回DataTable /// </summary> /// <param name="SQLString">查询语句</param> /// <returns>DataTable</returns> public static DataTable QueryTable(string SQLString) { using (MySqlConnection connection = new MySqlConnection(connectionString)) { DataTable dt = new DataTable(); try { connection.Open(); MySqlDataAdapter command = new MySqlDataAdapter(SQLString, connection); command.Fill(dt); } catch (MySql.Data.MySqlClient.MySqlException ex) { throw new Exception(ex.Message); } return dt; } } public static DataTable QueryTable(string SQLString, MySqlParameter[] cmdParms) { using (MySqlConnection connection = new MySqlConnection(connectionString)) { DataTable dt = new DataTable(); try { connection.Open(); MySqlCommand cmd = new MySqlCommand(SQLString, connection); cmd.CommandType = CommandType.Text; cmd.Parameters.AddRange(cmdParms); MySqlDataAdapter da = new MySqlDataAdapter(cmd); da.Fill(dt); } catch (MySql.Data.MySqlClient.MySqlException ex) { throw new Exception(ex.Message); } return dt; } } public static DataTable GetCurrPageData(string strSql, MySqlParameter[] cmdParms, int pageSize, int pageIndex, out int recordCount, out int pageCount) { using (MySqlConnection connection = new MySqlConnection(connectionString)) { recordCount = 0; pageCount = 0; DataTable dt = new DataTable(); try { connection.Open(); strSql += " limit " + pageSize * (pageIndex - 1) + ", " + pageSize + ";" + strSql + ";"; MySqlCommand cmd = new MySqlCommand(strSql, connection); cmd.CommandType = CommandType.Text; if (cmdParms != null && cmdParms.Length > 0) { cmd.Parameters.AddRange(cmdParms); } MySqlDataAdapter da = new MySqlDataAdapter(cmd); DataSet ds = new DataSet(); da.Fill(ds); dt = ds.Tables[0]; recordCount = ds.Tables[1].Rows.Count; pageCount = Convert.ToInt32(Math.Ceiling(Convert.ToDecimal(recordCount) / pageSize)); } catch (MySql.Data.MySqlClient.MySqlException ex) { throw new Exception(ex.Message); } return dt; } } public static DataTable GetCurrPageRecordData(string strSql, string strsql2, int pageSize, int pageIndex, out int recordCount, out int pageCount) { using (MySqlConnection connection = new MySqlConnection(connectionString)) { recordCount = 0; pageCount = 0; DataTable dt = new DataTable(); try { connection.Open(); strSql += " limit " + pageSize * (pageIndex - 1) + ", " + pageSize + ";"; MySqlCommand cmd = new MySqlCommand(strSql, connection); cmd.CommandType = CommandType.Text; MySqlDataAdapter da = new MySqlDataAdapter(cmd); DataSet ds = new DataSet(); da.Fill(ds); dt = ds.Tables[0]; ////////////////////////////////////////////////////////////////// cmd = new MySqlCommand(strsql2, connection); cmd.CommandType = CommandType.Text; da = new MySqlDataAdapter(cmd); ds = new DataSet(); da.Fill(ds); recordCount = int.Parse(ds.Tables[0].Rows[0]["COUNT(1)"].ToString()); pageCount = Convert.ToInt32(Math.Ceiling(Convert.ToDecimal(recordCount) / pageSize)); } catch (MySql.Data.MySqlClient.MySqlException ex) { throw new Exception(ex.Message); } return dt; } } #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 int ExecuteSqlTran(Hashtable SQLStringList) { using (MySqlConnection conn = new MySqlConnection(connectionString)) { conn.Open(); using (MySqlTransaction trans = conn.BeginTransaction()) { int val = 0; 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); val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); } trans.Commit(); } catch { trans.Rollback(); throw; } return val; } } } /// <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SqlParameter[]）</param> public static bool ExecuteSqlTran(List<MySqlCommand> commands) { using (MySqlConnection conn = new MySqlConnection(connectionString)) { conn.Open(); using (MySqlTransaction trans = conn.BeginTransaction()) { try { //循环 foreach (MySqlCommand myDE in commands) { myDE.Connection = conn; int val = myDE.ExecuteNonQuery(); } trans.Commit(); return true; } catch (Exception ex) { trans.Rollback(); throw ex; } } } } /// <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 }