In this paper, The idea of mapping multilevel secure database into several databases, and each subject operates on database trusted by himself is introduced.
本文提出了将多级安全数据库映射成为多个数据库，各个用户在其信赖的数据库上进行操作的思想。
JPQL is a full-featured query language with syntax similar to SQL, but it operates on entities rather than database tables.
JPQL是一种语法上类似于SQL的完备查询语言，但是它是在实体上，而不是在数据库表上进行操作。
The name of the database on which the tool operates.
该工具所操作的数据库名称。
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