获取程序可以不采用安全措施，也可以要求提供某种用户登录、Cookie或会话变量才能检索这些文件。
The fetching program can be left bare, or it can require some kind of user login, cookie, or session variable before it retrieves the file.
或会话启动即使用户不登录成功。
Either a session is starting even when the user does not log in successfully.
用户将不能从其他数据库角色继承权限，因为 WHERE 子句基于用户名或登录名而不基于角色。
Users will not be able to inherit permissions from other database roles, because the WHERE clause is based on user or login names, not on roles.
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