摘要
触发器技术是数据库设计与开发工作的重要内容,已广泛应用于数据库系统中。深入研究触发器技术,对于简化数据库操作、增强数据库安全性、提高开发效率等方面具有重要意义。文中在论述制定触发器计划的基础上,进行了四个方面的研究。研究DML和DDL两种触发器的分类并对二者进行比较;研究AFTER与INSTEAD OF触发器,包括二者的比较、触发时机和选择标准;研究触发器的嵌套和递归;研究DDL的数据库与服务器级触发器。
Trigger technology is an important content of the database design and development work,and it has been widely applied to the database system. Studying trigger technology deeply has a great significance to simplify database operations,enhance database security, improve development efficiency. In this paper,research four aspects based on discussing the trigger plan. Research the classification of DML and DDL triggers and compare the two;research AFTER and INSTEAD OF triggers,including a comparison of the two,trigger tim-ing and selection criteria;research the nest and recursive of trigger;research DDL database and server level trigger.
出处
《计算机技术与发展》
2013年第10期48-51,55,共5页
Computer Technology and Development
基金
2011辽宁省科学事业公益研究基金(2011004001)
作者简介
刘维学(1975-),男,讲师,研究方向为计算机应用技术、网络工程。