In makes an applied multi-level relation model to be basement of security database for following the BLP model.
为了适应BLP模型，采用一种实用的多级关系 模型作为安全数据库的基础，这是原有 关系 模型的扩展。
However, there are several security problems in such databases, such as modifying and copying grade easily. A multi-level management model of grade security is presented.
通过分析，提出考试系统成绩的安全性管理的多级管理模式，每一级均起到一定的保护作用。
However, there are several security problems in such databases, such as modifying and copying grade easily. A multi-level management model of grade security is presented.
通过分析，提出考试系统成绩的安全性管理的多级管理模式，每一级均起到一定的保护作用。
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