设置一个没有delete权限的帐号
开一个空权限帐号sys,密码为password
GRANT usage on *.* to sys@'%' identified by "password";
赋予sys所有库的所有权限
GRANT all on *.* to sys;
回收sys的所有库的drop和delete权限
REVOKE drop on *.* FROM sys;
REVOKE delete on *.* from sys;
当然,库名也可以指定
*.* 换成xx_table.*