database security and integrity

Oracle 10g is selected as database, since it has powerful management functions, and provides standard operational interface and support integrity, security management and distributed processing.

选择Oracle10g为后台数据库，它具有强大的数据管理功能，提供标准的操作接口，支持数据的完整性管理、安全性管理和分布式数据处理。

The database security involves data secret, integrity and usability.

数据库安全涉及到数据库中数据的机密性 、 完整性、可用性.

Database design is the key part of this paper, mainly divided into the database logical structure design, database design, database integrity and security design, database query and statistics and sequential design.

数据库的设计是本文的重点部分，主要分为数据库逻辑结构设计、数据库表设计、数据库完整性和安全性设计、数据库查询与统计的类与时序设计等。

For the former requirement to establish data consistency and integrity and data security database.

对于前者要求建立起数据一致性和完整性强、数据安全性好的数据库.

For the former requirement to establish data consistency and integrity and data security database well.

对前者要求成立起数据一致性和完整性强、数据安全性好的库.

The constraints security layer consists of integrity constraints, classification and inference constraints, access constraints, and application semantics constraints. The adaptive detection layer consists of active database lev-el, relation schema level, transaction level and application semantics level.

将约束安全层分为完整性约束、分级和推理约束、访问约束和应用语义约束四个子层，将适应性检测层分为数据库活动级、关系模式级、事务级和应用语义级四个子层。