MySql数据库连接操作

主要封装为MySqlHelper类

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namespace CiWong.LearningLevelApi.MySqlHelp {     /// <summary>     /// MySqlHelper 类是基于.net框架开发的数据库操作类     /// </summary>     public class MySqlHelper     {         #region 缓存Hashtable         // 存储缓存参数的Hashtable         private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());         #endregion           #region 重载+1 获取连接字符串         /// <summary>         /// 重载+1 获取连接字符串 [GetStrCon()]         /// </summary>         /// <returns>连接字符串(如果配置文件中无[SQL]名称的连接字符串，则抛出异常)</returns>         public static string GetStrCon()         {             try             {                 string CONN_STRING = ConfigurationManager.ConnectionStrings["QuesContext"].ConnectionString;                 return CONN_STRING;             }             catch (Exception ex)             {                 Console.WriteLine(string.Format("配置文件中没有[SQL]名称的connectionStrings！错误原因：{0}", ex.ToString()));                 throw;             }         }         #endregion           #region 重载+2 获取连接字符串         /// <summary>         /// 重载+2 获取连接字符串 [GetStrCon(string strConfig)]         ///     如果配置文件中有strConfig为名称的连接字符串，则         ///         获取它的内容         ///     如果没有，则默认strConfig为连接字符串         /// </summary>         /// <param name="strConfig">配置文件中连接字符串的名称</param>         /// <returns>连接字符串</returns>         public static string GetStrCon(string strConfig)         {             string CONN_STRING = string.Empty;             if (ConfigurationManager.ConnectionStrings[strConfig] != null)                 CONN_STRING = ConfigurationManager.ConnectionStrings[strConfig].ConnectionString;             else                 CONN_STRING = strConfig;             return CONN_STRING;         }         #endregion           #region 重载+1 创建连接对象 [GetConn()]         /// <summary>         /// 重载+1 返回 conn连接对象 [GetConn()]         /// </summary>         /// <returns> MySqlConnection </returns>         public static MySqlConnection GetConn()         {             try             {                 return new MySqlConnection(GetStrCon());             }             catch (Exception ex)             {                 Console.WriteLine(ex.ToString());                 throw;             }         }         #endregion           #region 重载+2 创建连接对象 [GetConn()]         /// <summary>         /// 重载+2 返回 conn连接对象 [GetConn()]         ///     如果配置文件中有strConfig名称的连拉字符串，则         ///         获取它的内容         ///     如果没有，则默认strConfig为连接字符串         /// </summary>         /// <param name="strConfig">配置文件中连接字符串的名称</param>         /// <returns> MySqlConnection </returns>         public static MySqlConnection GetConn(string strConfig)         {             try             {                 return new MySqlConnection(GetStrCon(strConfig));             }             catch (Exception ex)             {                 Console.WriteLine(ex.ToString());                 throw;             }         }         #endregion           #region 关闭连接[CloseConn(...)]         /// <summary>         /// 关闭 conn连接对象         /// </summary>         /// <param name="conn">连接对象</param>         public static void CloseConn(MySqlConnection conn)         {             if (conn.State != ConnectionState.Closed)                 conn.Close();         }         #endregion           #region 清空与指定连接相关的连接池         /// <summary>         /// 清空与指定连接相关的连接池 [ClosePool(MySqlConnection conn)]         /// </summary>         public static void ClosePool(MySqlConnection conn)         {             MySqlConnection.ClearPool(conn);         }         #endregion           #region 清空所有连接池         /// <summary>         /// 清空所有连接池 [ClosePool()]         /// </summary>         public static void ClosePool()         {             MySqlConnection.ClearAllPools();         }         #endregion           #region 返回MySqlCommand对象[GetCmd(...)]         /// <summary>         /// 返回MySqlCommand对象         /// </summary>         /// <param name="conn">conn 连接对象</param>         /// <param name="trans">事物对象</param>         /// <param name="cmdType">SQL 执行的类型</param>         /// <param name="cmdText">SQL 执行语句</param>         /// <param name="cmdParms">MySqlParameter[] 对象</param>         /// <returns> 返回comm 对象</returns>         public static MySqlCommand GetCmd(MySqlConnection conn, MySqlTransaction trans, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)         {             try             {                 if (conn.State != ConnectionState.Open)                     conn.Open();                   MySqlCommand cmd = new MySqlCommand();                 cmd.Connection = conn;                 cmd.CommandType = cmdType;                 cmd.CommandText = cmdText;                   if (trans != null)                     cmd.Transaction = trans;                   if (cmdParms != null)                 {                     foreach (MySqlParameter parm in cmdParms)                         cmd.Parameters.Add(parm);                 }                   return cmd;             }             catch (Exception ex)             {                 Console.WriteLine(ex.ToString());                 throw;             }         }         #endregion           #region 重载+1 通过连接字符串，执行SqlCommand(不返回结果集)[ExecuteNonQuery(...)]         /// <summary>         /// 重载+1 通过连接字符串，执行SqlCommand(不返回结果集)         /// 利用提供的参数值                /// </summary>         /// <remarks>         /// e.g.:          ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter("@prodid", 24));         /// </remarks>         /// <param name="connString">为MySqlConnection对象提供：一个有效的连接字符串</param>         /// <param name="cmdType">命令类别：存储过程、文本字符串等</param>         /// <param name="cmdText">存储过程名称或SQL命令文本</param>         /// <param name="cmdParms">执行命令的参数列表</param>         /// <returns>执行命令受影响的记录条数</returns>         public static int ExecuteNonQuery(string connString, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)         {             try             {                 MySqlCommand cmd = new MySqlCommand();                   using (MySqlConnection conn = new MySqlConnection(connString))                 {                     PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);                     int val = cmd.ExecuteNonQuery();                     cmd.Parameters.Clear();                     cmd.Dispose();                     return val;                 }             }             catch (Exception ex)             {                 //引发异常，没有记录受影响                 Console.WriteLine(ex.ToString());                 throw;             }         }         #endregion           #region 重载+2 通过存在的MySqlConnection对象，执行MySqlCommand(不返回结果集)[ExecuteNonQuery(...)]         /// <summary>         /// 重载+2 通过存在的MySqlConnection对象，执行MySqlCommand(不返回结果集)         /// 利用提供的参数值            /// </summary>         /// <remarks>         /// e.g.:          ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter("@prodid", 24));         /// </remarks>         /// <param name="conn">一个已经存在的SqlConnection对象</param>         /// <param name="cmdType">命令类别：存储过程、文本字符串等</param>         /// <param name="cmdText">存储过程名称或SQL命令文本</param>         /// <param name="cmdParms">执行命令的参数列表</param>         /// <returns>执行命令受影响的记录条数</returns>         public static int ExecuteNonQuery(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)         {             try             {                 MySqlCommand cmd = new MySqlCommand();                   PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);                 int val = cmd.ExecuteNonQuery();                 cmd.Parameters.Clear();                 cmd.Dispose();                 return val;             }             catch (Exception ex)             {                 Console.WriteLine(ex.ToString());                 //引发异常，没有记录受影响                 throw;             }             finally             {                 conn.Close();             }         }         #endregion           #region 重载+3  通过存在的 MySqlTransaction，执行MySqlCommand(不返回结果集)[ExecuteNonQuery(...)]         /// <summary>         /// 重载+3  通过存在的 MySqlTransaction，执行MySqlCommand(不返回结果集)         /// 利用提供的参数值                /// </summary>         /// <remarks>         /// e.g.:          ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter("@prodid", 24));         /// </remarks>                /// <param name="trans">一个已经存在的 trans</param>         /// <param name="cmdType">命令类别：存储过程、文本字符串等</param>         /// <param name="cmdText">存储过程名称或SQL命令文本</param>         /// <param name="cmdParms">执行命令的参数列表</param>         /// <returns>执行命令受影响的记录条数</returns>         public static int ExecuteNonQuery(MySqlTransaction trans, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)         {             try             {                 MySqlCommand cmd = new MySqlCommand();                   PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, cmdParms);                 int val = cmd.ExecuteNonQuery();                 cmd.Parameters.Clear();                 cmd.Dispose();                 return val;             }             catch (Exception ex)             {                 //引发异常，没有记录受影响                 Console.WriteLine(ex.ToString());                 throw;             }             finally             {                 trans.Connection.Close();             }         }         #endregion           #region 重载+1 通过连接字符串，执行MySqlCommand(返回结果集)  [ExecuteDataSet(...)]         /// <summary>         /// 重载+1 通过连接字符串，执行MySqlCommand(返回结果集)         /// 利用提供的参数值                /// </summary>         /// <remarks>         /// e.g.:          ///  DataSet ds = ExecuteDataSet(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter("@prodid", 24));         /// </remarks>         /// <param name="connString">为MySqlConnection对象提供：一个有效的连接字符串</param>         /// <param name="cmdType">命令类别：存储过程、文本字符串等</param>         /// <param name="cmdText">存储过程名称或SQL命令文本</param>         /// <param name="cmdParms">执行命令的参数列表</param>         /// <returns>返回一个结果集：DataSet对象</returns>         public static DataSet ExecuteDataSet(string connString, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)         {             DataSet ds = new DataSet();             //使用一个异常，如果发生异常，则将连接关闭              try             {                 using (MySqlConnection conn = new MySqlConnection(connString))                 {                     MySqlCommand cmd = new MySqlCommand();                     PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);                     MySqlDataAdapter adp = new MySqlDataAdapter(cmd);                     adp.Fill(ds);                     cmd.Parameters.Clear();                     cmd.Dispose();                     return ds;                 }             }             catch (Exception ex)             {                 Console.WriteLine(ex.ToString());                 throw;             }         }         #endregion           #region 重载+2 通过已经存在的MySqlConnection对象，执行MySqlCommand(返回结果集)  [ExecuteDataSet(...)]         /// <summary>         /// 重载+2 通过已经存在的MySqlConnection对象，执行MySqlCommand(返回结果集)         /// 利用提供的参数值                /// </summary>         /// <remarks>         /// e.g.:          ///  DataSet ds = ExecuteDataSet(conn, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter("@prodid", 24));         /// </remarks>         /// <param name="conn">一个已经存在的MySqlConnection对象</param>         /// <param name="cmdType">命令类别：存储过程、文本字符串等</param>         /// <param name="cmdText">存储过程名称或SQL命令文本</param>         /// <param name="cmdParms">执行命令的参数列表</param>         /// <returns>返回一个结果集：DataSet对象</returns>         public static DataSet ExecuteDataSet(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)         {             DataSet ds = new DataSet();             //使用一个异常，如果发生异常，则将连接关闭              try             {                 MySqlCommand cmd = new MySqlCommand();                 PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);                 MySqlDataAdapter adp = new MySqlDataAdapter(cmd);                 adp.Fill(ds);                 cmd.Parameters.Clear();                 cmd.Dispose();                 return ds;             }             catch (Exception ex)             {                 Console.WriteLine(ex.ToString());                 throw;             }             finally             {                 conn.Close();             }         }         #endregion           #region 重载+1 通过连接字符串，执行MySqlCommand(返回结果集的一个MySqlDataReader对象)[ExecuteReader(...)]         /// <summary>         /// 重载+1 通过连接字符串，执行MySqlCommand(返回结果集的一个MySqlDataReader对象)         /// 利用提供的参数值                /// </summary>         /// <remarks>         /// e.g.:          ///  MySqlDataReader r = ExecuteReader(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter("@prodid", 24));         /// </remarks>         /// <param name="connString">为MySqlConnection对象提供：一个有效的连接字符串</param>         /// <param name="cmdType">命令类别：存储过程、文本字符串等</param>         /// <param name="cmdText">存储过程名称或SQL命令文本</param>         /// <param name="cmdParms">执行命令的参数列表</param>            /// <returns>包含结果集的一个：MySqlDataReader对象</returns>         public static MySqlDataReader ExecuteReader(string connString, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)         {             MySqlConnection conn = new MySqlConnection(connString);               //使用一个异常，如果发生异常，则将连接关闭                      try             {                 MySqlCommand cmd = new MySqlCommand();                 PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);                 MySqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);                 cmd.Parameters.Clear();                 cmd.Dispose();                 return rdr;             }             catch (Exception ex)             {                 CloseConn(conn);                 Console.WriteLine(ex.ToString());                 throw;             }         }         #endregion           #region 重载+2 通过已经存在的MySqlConnection对象，执行MySqlCommand(返回结果集的一个MySqlDataReader对象) [ExecuteReader(...)]         /// <summary>         /// 重载+2 通过已经存在的MySqlConnection对象，执行MySqlCommand(返回结果集的一个MySqlDataReader对象)         /// 利用提供的参数值                /// </summary>         /// <remarks>         /// e.g.:          ///  MySqlDataReader r = ExecuteReader(conn, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter("@prodid", 24));         /// </remarks>         /// <param name="conn">一个已经存在的SqlConnection对象</param>         /// <param name="cmdType">命令类别：存储过程、文本字符串等</param>         /// <param name="cmdText">存储过程名称或SQL命令文本</param>         /// <param name="cmdParms">执行命令的参数列表</param>                    /// <returns>包含结果集的一个：MySqlDataReader对象</returns>         public static MySqlDataReader ExecuteReader(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)         {             //使用一个异常，如果发生异常，则将连接关闭              try             {                 MySqlCommand cmd = new MySqlCommand();                 PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);                 MySqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);                 cmd.Parameters.Clear();                 cmd.Dispose();                 return rdr;             }             catch (Exception ex)             {                 CloseConn(conn);                 Console.WriteLine(ex.ToString());                 throw;             }         }         #endregion           #region 重载+1 通过连接字符串，执行MySqlCommand [ExecuteScalar(...)]         /// <summary>         /// 重载+1 通过连接字符串，执行MySqlCommand(返回第一条记录的第一列的值，一般是返回汇总值等;如：select max(id) from userTab)         /// 利用提供的参数值                        /// </summary>         /// <remarks>         /// e.g.:          ///  Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter("@prodid", 24));         /// </remarks>         /// <param name="connString">为MySqlConnection对象提供：一个有效的连接字符串</param>         /// <param name="cmdType">命令类别：存储过程、文本字符串等</param>         /// <param name="cmdText">存储过程名称或SQL命令文本</param>         /// <param name="cmdParms">执行命令的参数列表</param>            /// <returns>返回一个对象：如果要使用具体的值，需要使用Convert.To{Type}进行转换</returns>         public static object ExecuteScalar(string connString, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)         {             try             {                 MySqlCommand cmd = new MySqlCommand();                   using (MySqlConnection conn = new MySqlConnection(connString))                 {                     PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);                     object val = cmd.ExecuteScalar();                     cmd.Parameters.Clear();                     cmd.Dispose();                     return val;                 }             }             catch (Exception ex)             {                 Console.WriteLine(ex.ToString());                 throw;             }         }         #endregion           #region 重载+2 通过已经存在的MySqlConnection对象，执行MySqlCommand [ExecuteScalar(...)]         /// <summary>         /// 重载+2 通过已经存在的MySqlConnection对象，执行MySqlCommand(返回第一条记录的第一列的值，一般是返回汇总值等;如：Select max(ColumnName) From TableName)         /// 利用提供的参数值            /// </summary>         /// <remarks>         /// e.g.:          ///  Object obj = ExecuteScalar(conn, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter("@prodid", 24));         /// </remarks>         /// <param name="conn">一个已经存在的SqlConnection对象</param>         /// <param name="cmdType">命令类别：存储过程、文本字符串等</param>         /// <param name="cmdText">存储过程名称或SQL命令文本</param>         /// <param name="cmdParms">执行命令的参数列表</param>         /// <returns>返回一个对象：如果要使用具体的值，需要使用Convert.To{Type}进行转换</returns>         public static object ExecuteScalar(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] cmdParms)         {             try             {                 MySqlCommand cmd = new MySqlCommand();                   PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);                 object val = cmd.ExecuteScalar();                 cmd.Parameters.Clear();                 cmd.Dispose();                 return val;             }             catch (Exception ex)             {                 Console.WriteLine(ex.ToString());                 throw;             }             finally             {                 CloseConn(conn);             }         }         #endregion           #region 将参数数组增加至Hashtable，缓存在缓冲区 [CacheParameters(...)]         /// <summary>         /// 存储：将参数数组增加至缓冲区              /// </summary>         /// <param name="cacheKey">缓冲区参数的键名</param>         /// <param name="cmdParms">缓冲区对应键名的参数值</param>         public static void CacheParameters(string cacheKey, params MySqlParameter[] cmdParms)         {             parmCache[cacheKey] = cmdParms;         }         #endregion           #region 从缓冲区得到Hashtable中的参数列表的值 [GetCachedParameters(...)]         /// <summary>         /// 检索值：得到缓冲区中的参数列表值         /// </summary>         /// <param name="cacheKey">缓冲区参数的键名</param>         /// <returns>缓冲区对应键名的参数值</returns>         public static MySqlParameter[] GetCachedParameters(string cacheKey)         {             //获取 key 为cachekey 的值 parmCache[参数化SQL语句]=parameter[]数据组对象             MySqlParameter[] cachedParms = (MySqlParameter[])parmCache[cacheKey];               //如果不存在 则返回为空             if (cachedParms == null)                 return null;             //反之 Hashtable表中存在 key为cacheky 的对象则返回 他的 副本 对象 par[]             MySqlParameter[] clonedParms = new MySqlParameter[cachedParms.Length];               for (int i = 0, j = cachedParms.Length; i < j; i++)                 clonedParms[i] = (MySqlParameter)((ICloneable)cachedParms[i]).Clone();               return clonedParms;         }         #endregion           #region 执行预定义Command对象[PrepareCommand(...)]         /// <summary>         /// 要执行:预定义Command对象(PrepareCommand)         /// </summary>         /// <param name="cmd">MySqlCommand 对象</param>         /// <param name="conn">MySqlConnection 对象</param>         /// <param name="trans">MySqlTransaction 对象</param>         /// <param name="cmdType">命令类别：存储过程、文本字符串等</param>         /// <param name="cmdText">存储过程名称或SQL命令文本,如：select * from UserTab</param>                /// <param name="cmdParms">Command对象需要使用的参数列表</param>         public static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, CommandType cmdType, string cmdText, MySqlParameter[] cmdParms)         {             try             {                 if (conn.State != ConnectionState.Open)                     conn.Open();                   cmd.Connection = conn;                 cmd.CommandText = cmdText;                   if (trans != null)                     cmd.Transaction = trans;                   cmd.CommandType = cmdType;                   if (cmdParms != null)                 {                     foreach (MySqlParameter parm in cmdParms)                         cmd.Parameters.Add(parm);                 }             }             catch (Exception ex)             {                 Console.WriteLine(ex.ToString());                 throw;             }         }         #endregion           #region 提交事务 [TransactionCommit(...)]         /// <summary>         /// 提交事务         /// </summary>         /// <param name="trans">事务</param>         public static void TransactionCommit(MySqlTransaction trans)         {             trans.Commit();         }         #endregion           #region 回滚事务 [TransactionRollback(...)]         /// <summary>         /// 回滚事务         /// </summary>         /// <param name="trans">事务</param>         public static void TransactionRollback(MySqlTransaction trans)         {             trans.Rollback();         }         #endregion     } }