没有语法错误就是不执行，大神帮我看看错在哪里啊
语句如下
"CREATE EVENT IF NOT EXISTS clear_ram_".$pet_id."
ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 120 SECOND
COMMENT 'Clears out petlbs.ram table after 1 hour.'
DO DELETE FROM petlbs_ram_".$pet_id
在information_schema的EVENTS表里能看到的，感觉是语句的错误，求解。
