摘要
对触发器的概念和功能作了详细的介绍,针对Oracle数据库举例说明了触发器在数据库完整性约束方面的应用。
This article mainly introduces the conception and functions of the trigger which is often used in the large database systems. And then an example of Oracle is taken to explain the application of trigger in corresponding restraint of database.
出处
《计算机与现代化》
2005年第5期67-68,71,共3页
Computer and Modernization
关键词
触发器
数据的参照完整性
外部码
级联更新
trigger
reference integrality of data
foreign key
cascade update
