MySQL Query Error [1064] 错误信息: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AND grade = 3 ORDER BY displayorder DESC,dateline DESC LIMIT 0,4' at line 1 SQL: SELECT * FROM brand_consumeitems WHERE shopid = AND grade = 3 ORDER BY displayorder DESC,dateline DESC LIMIT 0,4