摘要： 通过利用在关系型数据库中所提供的约束、默认、规则和嵌套触发器技术，对来自客户端的数据进行有效性和合法性的检验，有效地保证了数据源的正确性和完整性；此外，合理地定义和应用一项数据完整性的检验策略，可以更有效地提高数据存储和检索的效率。

关键词: 数据合法性, 约束, 默认, 规则

Abstract: Data from client is validated through constraints, rules, default and technique of trigger provided by the relational database system, thus validity and integrity of data source are ensured. The efficiency of data storage and search is improved by defining and deploying policy to verify data reasonably.

中图分类号: 

• TP311.13