Dapper常用方法总结

常用方法

#region Dapper 数据库操作


        #region Query 操作

        /// <summary>
        /// 无参获取单个实体modle
        /// </summary>
        /// <param name="sqlstr"></param>
        /// <returns>T</returns>
        public static T QueryModel<T>(string sqlstr) where T : new()
        {

            T t = new T();
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {

                try
                {
                    connection.Open();
                    t = connection.QueryFirstOrDefault<T>(sqlstr);
                }
                catch (MySql.Data.MySqlClient.MySqlException ex)
                {
                    //throw new Exception(ex.Message);
                    connection.Close();
                }
            }

            return t;
        }


        /// <summary>
        /// 参数化获取单个实体modle 
        /// </summary>
        /// <param name="sqlstr">执行sql语句</param>
        /// <param name="parms">参数数组</param>
        /// <returns>T</returns>
        public static T QueryModel<T>(string sqlstr, params MySqlParameter[] parms) where T : new()
        {

            T t = new T();
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {

                try
                {
                    connection.Open();
                    var args = new DynamicParameters(new { });
                    foreach (MySqlParameter parm in parms)
                    {
                        args.Add(parm.ParameterName,parm.Value);
                    }
                    t = connection.QueryFirstOrDefault<T>(sqlstr,args);
                                   
                }
                catch (MySql.Data.MySqlClient.MySqlException ex)
                {
                    //throw new Exception(ex.Message);
                    connection.Close();
                }
            }

            return t;
        }

        /// <summary>
        /// 获取多个实体modle
        /// </summary>
        /// <param name="sqlString">查询语句</param>
        /// <returns>List<T></returns>
        public static List<T> QueryModelList<T>(string sqlString) where T : new()
        {

            List<T> tlist = new List<T>();
            using (MySqlConnection connection = new MySqlConnection(DbHelperMySQL.connectionString))
            {

                try
                {
                    connection.Open();
                    tlist = connection.Query<T>(sqlString).ToList();
                }
                catch (MySql.Data.MySqlClient.MySqlException ex)
                {
                    //throw new Exception(ex.Message);
                    connection.Close();
                }
                return tlist;
            }
        }

        /// <summary>
        ///  参数化获取多个实体modle
        /// </summary>
        /// <param name="sqlString">查询语句</param>
        /// <returns>List<T></returns>
        public static List<T> QueryModelList<T>(string sqlString, params MySqlParameter[] parms) where T : new()
        {

            List<T> tlist = new List<T>();
            using (MySqlConnection connection = new MySqlConnection(DbHelperMySQL.connectionString))
            {

                try
                {
                    connection.Open();
                    var args = new DynamicParameters(new { });
                    foreach (MySqlParameter parm in parms)
                    {
                        args.Add(parm.ParameterName, parm.Value);
                    }
                    tlist = connection.Query<T>(sqlString, args).ToList();
                }
                catch (MySql.Data.MySqlClient.MySqlException ex)
                {
                    //throw new Exception(ex.Message);
                    connection.Close();
                }
                return tlist;
            }
        }


        #endregion


        #region Execute  操作

        /// <summary>
        /// 单条执行一条sql数据
        /// </summary>
        /// <param name="sqlstr">执行语句</param>
        /// <returns></returns>
        public static int Execute(string sqlstr)
        {
            int obj = 0;
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {

                try
                {
                    connection.Open();
                    obj = connection.Execute(sqlstr);
                }
                catch (MySql.Data.MySqlClient.MySqlException ex)
                {
                    //throw new Exception(ex.Message);
                    connection.Close();

                }
            }

            return obj;
        }


        /// <summary>
        /// 参数化单条执行一条sql数据
        /// </summary>
        /// <param name="sqlstr">执行语句</param>
        /// <returns></returns>
        public static int Execute(string sqlstr, params MySqlParameter[] parms)
        {
            int obj = 0;
            using (MySqlConnection connection = new MySqlConnection(connectionString))
            {

                try
                {
                    connection.Open();
                    var args = new DynamicParameters(new { });
                    foreach (MySqlParameter parm in parms)
                    {
                        args.Add(parm.ParameterName, parm.Value);
                    }
                    obj = connection.Execute(sqlstr, args);
                }
                catch (MySql.Data.MySqlClient.MySqlException ex)
                {
                    //throw new Exception(ex.Message);
                    connection.Close();

                }
            }

            return obj;
        }






        #endregion




        #endregion