随笔分类 -  交换系统

交换系统防止重复插入数据
摘要：在插入数据之前先删除重复的数据 create or replace trigger tri__Housebefore insert on t__House FOR EACH ROW declare pragma autonomous_transaction; begin delete from t_ 阅读全文
posted @ 2017-10-23 15:32 letmedown 阅读(120) 评论(0) 推荐(0)