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using System; using System.Collections.Generic; using System.Configuration; using MySql.Data.MySqlClient; using System.Data; namespace Utils { /// <summary> /// MySQL数据库工具类 /// </summary> public abstract class MySQLUtil { /// <summary> /// 数据库连接字符串 /// </summary> public static readonly string ConnStr = ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString; /// <summary> /// 执行语句并返回影响的行数 /// </summary> /// <param name="connStr">数据库连接字符串</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>影响的行数</returns> public static int ExecuteNonQuery(string connStr, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { using (var conn = new MySqlConnection(connStr)) { return ExecuteNonQuery(conn, cmdType, cmdText, parameters); } } /// <summary> /// 执行语句并返回影响的行数 /// </summary> /// <param name="conn">数据库连接</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>影响的行数</returns> public static int ExecuteNonQuery(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { using (var cmd = new MySqlCommand()) { PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters); var val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return val; } } /// <summary> /// 执行语句并返回影响的行数 /// </summary> /// <param name="trans">事务</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>影响的行数</returns> public static int ExecuteNonQuery(MySqlTransaction trans, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { using (var cmd = new MySqlCommand()) { PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, parameters); var val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return val; } } /// <summary> /// 执行语句并返回DataReader对象 /// </summary> /// <param name="connStr">数据库连接字符串</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>执行语句并返回DataReader对象</returns> /// <remarks>P.S：DataReader使用后要手动释放</remarks> public static MySqlDataReader ExecuteReader(string connStr, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { var cmd = new MySqlCommand(); var conn = new MySqlConnection(connStr); try { PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters); var dr = cmd.ExecuteReader(CommandBehavior.CloseConnection); cmd.Parameters.Clear(); return dr; } catch { conn.Close(); throw; } } /// <summary> /// 执行语句并返回DataSet对象 /// </summary> /// <param name="cmdText"></param> /// <param name="parameters"></param> /// <returns></returns> public static DataSet ExecuteDataSet(string cmdText, params MySqlParameter[] parameters) { return ExecuteDataSet(ConnStr, CommandType.Text, cmdText, parameters); } /// <summary> /// 执行语句并返回DataSet对象 /// </summary> /// <param name="connStr">数据库连接字符串</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>执行语句并返回DataSet对象</returns> /// <returns></returns> public static DataSet ExecuteDataSet(string connStr, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { using (var conn = new MySqlConnection(connStr)) { return ExecuteDataSet(conn, cmdType, cmdText, parameters); } } /// <summary> /// 执行语句并返回DataSet对象 /// </summary> /// <param name="connStr">数据库连接字符串</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>执行语句并返回DataSet对象</returns> /// <returns></returns> public static DataSet ExecuteDataSet(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { using (var cmd = new MySqlCommand()) { PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters); using (var da = new MySqlDataAdapter(cmd)) { var ds = new DataSet(); try { da.Fill(ds, "ds"); cmd.Parameters.Clear(); } catch (MySqlException ex) { throw new Exception(ex.Message); } return ds; } } } /// <summary> /// 执行语句并返回一个对象 /// </summary> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>返回一个object对象，对象中只包含一列。</returns> public static object ExecuteScalar(string cmdText, params MySqlParameter[] parameters) { return ExecuteScalar(ConnStr, CommandType.Text, cmdText, parameters); } /// <summary> /// 执行语句并返回一个对象 /// </summary> /// <param name="connStr">数据库连接字符串</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>返回一个object对象，对象中只包含一列。</returns> public static object ExecuteScalar(string connStr, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { using (var conn = new MySqlConnection(connStr)) { return ExecuteScalar(conn, cmdType, cmdText, parameters); } } /// <summary> /// 执行语句并返回一个对象 /// </summary> /// <param name="conn">数据库连接</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="parameters">参数集</param> /// <returns>返回一个object对象，对象中只包含一列。</returns> public static object ExecuteScalar(MySqlConnection conn, CommandType cmdType, string cmdText, params MySqlParameter[] parameters) { using (var cmd = new MySqlCommand()) { PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters); var val = cmd.ExecuteScalar(); cmd.Parameters.Clear(); return val; } } /// <summary> /// 为执行准备命令对象 /// </summary> /// <param name="cmd">command 对象</param> /// <param name="conn">连接对象</param> /// <param name="trans">事务对象</param> /// <param name="cmdType">命令类型</param> /// <param name="cmdText">命令字符串</param> /// <param name="cmdParms">参数集</param> private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, CommandType cmdType, string cmdText, IEnumerable<MySqlParameter> parameters) { if (conn.State != ConnectionState.Open) conn.Open(); cmd.Connection = conn; cmd.CommandText = cmdText; if (trans != null) cmd.Transaction = trans; cmd.CommandType = cmdType; if (parameters == null) return; foreach (var parm in parameters) cmd.Parameters.Add(parm); } } } |