public IEnumerable<T> Querys<T>()
        {//查询结果为IEnumerable类型，T为需要查询表的实体模型
            IDbConnection connection = new SqlConnection("链接字符串");
            return connection.Query<T>("SQL语句");
        }
        public DataTable DataReaders()
        {//查询结果为DataTable类型，内存中数据的一个表
            IDbConnection connection = new SqlConnection("链接字符串");
            var DataReaders = connection.ExecuteReader("SQL语句");
            DataTable dataTable = new DataTable();
            dataTable.Load(DataReaders);return ds;
        }
        public int exes()
        {//结果为sql语句的受影响行数
            IDbConnection connection = new SqlConnection("链接字符串");
            return connection.Execute("SQL语句");
        }