public override IEnumerable <T> GetByIds <T>(object ids, string returnFields = null)
        {
            var sqls = GetDapperSqls(typeof(T));

            if (string.IsNullOrEmpty(sqls.KeyName))
            {
                throw new Exception("表[" + sqls.TableName + "]没有主键");
            }
            if (DapperCommon.ObjectIsEmpty(ids))
            {
                return(Enumerable.Empty <T>());
            }

            Dapper.DynamicParameters dpar = new Dapper.DynamicParameters();
            dpar.Add("@ids", ids);
            if (string.IsNullOrEmpty(returnFields))
            {
                return(Query <T>(sqls.GetByIdsSql, dpar));
            }
            else
            {
                string sql = string.Format("SELECT {0} FROM [{1}] WHERE [{2}] IN @ids", returnFields, sqls.TableName, sqls.KeyName);
                return(Query <T>(sql, dpar));
            }
        }
        public override int DeleteByIds <T>(object ids)
        {
            var sqls = GetDapperSqls(typeof(T));

            if (string.IsNullOrEmpty(sqls.KeyName))
            {
                throw new Exception("表[" + sqls.TableName + "]没有主键");
            }
            if (DapperCommon.ObjectIsEmpty(ids))
            {
                return(0);
            }
            Dapper.DynamicParameters dpar = new Dapper.DynamicParameters();
            dpar.Add("@ids", ids);
            return(Execute(sqls.DeleteByIdsSql, dpar));
        }
        public override IEnumerable <T> GetByIdsWhichField <T>(object ids, string whichField, string returnFields = null)
        {
            var sqls = GetDapperSqls(typeof(T));

            if (DapperCommon.ObjectIsEmpty(ids))
            {
                return(Enumerable.Empty <T>());
            }

            Dapper.DynamicParameters dpar = new Dapper.DynamicParameters();
            dpar.Add("@ids", ids);
            if (string.IsNullOrEmpty(returnFields))
            {
                returnFields = sqls.AllFields;
            }
            string sql = string.Format("SELECT {0} FROM [{1}] WHERE [{2}] IN @ids", returnFields, sqls.TableName, whichField);

            return(Query <T>(sql, dpar));
        }