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文中讨论了铁路客票发售与预订系统数据库访问的三种安全性模型， 分别是用于客户端的前台模型， 用于服务器定时任务工作完成后台模型和不同服务器之间互相访问的互联模型
This paper discusses three kinds of security models for database access of railway ticket sale and booking system, which are the foreground model for client, the background model for server timing task and the interconnected model for mutual access between different servers