数据完整性应用的深入研究

数据完整性是指数据库中的数据在逻辑上的一致性，它是数据库设计中首要考虑的问题，必须保证所有数据处于正确的状态。在绝大多数场合利用域完整性、实体完整性、参考完整性技术能够保证数据的一致性，但在某些较为复杂的业务逻辑中，用户必须自定义数据完整性，借助触发器等技术手段来实现数据的一致性。

The In - depth Research of Data Integrality

Data integrality means logical consistency of data in the database, which is the problem of the initial consideration in database design, as all data must be guaranteed to be placed in the right appearance. In most cases, data integrality may be guaranteed with domain integrality,entity integrality and reference integrality,but in some other cases of somehow more comlecated business logic,the user has to definite its own data completion and take advantage of trigger technology as well as other technology to insure data integrality.