增加模块安装时提未如下代码，什么情况？如何处理？
MySQL Error: Execute SQL error, message : SQLSTATE[42000]: Syntax error or access violation: 1064 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 'DROP TABLE IF EXISTS `yzm_shuju`' at line 1 | DROP TABLE IF EXISTS `yzm_shuju`
