userinfo类控制用户信息数据库并与之进行交互。
The UserInfo class controls and interacts with the user information database.
AAA服务器通常与网络访问和网关服务，包含用户信息数据库和目录。
The AAA server typically interacts with network access and gateway serve and with databases and directories containing user information.
允许用户将更新后的信息提交回数据库。
Allow the user to submit the updated information back to the database.
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