设置之后，就不再缓存密码，对于所有密码身份验证，都要查询注册表。
Once set, passwords will no longer be cached and all password authentications will result in a query of the registry.
在这里，它只是针对固定值检查提供的用户名和密码，但它可以轻松使用一个数据库查询或其他机制替代。
In this case, it just checks the supplied username and password against fixed values, but it could easily use a database lookup or other mechanism instead.
指定了两个SQL查询——一个用于选择用户和相应密码的列表，另一个用于选择用户名和组名之间的映射。
Two SQL queries are specified — one for selecting a list of users and corresponding passwords and another for selecting mappings between user names and group names.
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