你可以根據語句反推,其實表的列不是固定的 ，包含了那些列就可以了。

select?password?from?users?where?username?=??

select?password,?password_salt?from?users?where?username?=??

select?role_name?from?user_roles?where?username?=??

select?permission?from?roles_permissions?where?role_name?=??