mysql存储过程增量更新
时间: 2023-10-27 22:59:33 浏览: 47
为了实现MySQL存储过程的增量更新,你可以使用临时表的方式来实现。首先,你可以创建一个临时表,将待更新的数据插入到临时表中。然后,你可以使用SELECT语句连接主表和临时表,查询出重复的数据。接下来,使用NOT EXISTS来剔除重复数据,并将临时表中与主表不同的数据导入主表中。 这样就可以实现增量更新的目的。
下面是一个示例的MySQL存储过程,用于实现增量更新:
```sql
DROP PROCEDURE IF EXISTS insertdisticepersonalproject;
CREATE PROCEDURE insertdisticepersonalproject()
BEGIN
INSERT INTO xjnu_project (id, xjnu_name, xjnu_projectname, xjnu_yixk, xjnu_zjxy)
SELECT xjnu_temp_project.id, xjnu_temp_project.xjnu_name, xjnu_temp_project.xjnu_projectname, xjnu_temp_project.xjnu_yixk, xjnu_temp_project.xjnu_zjxy
FROM xjnu_temp_project
WHERE (
NOT EXISTS (
SELECT *
FROM xjnu_project
WHERE xjnu_project.xjnu_name = xjnu_temp_project.xjnu_name
AND xjnu_project.xjnu_projectname = xjnu_temp_project.xjnu_projectname
)
);
END;
```
以上存储过程将从临时表xjnu_temp_project中选取与主表xjnu_project不重复的数据,并插入到主表中,实现了增量更新的功能。你可以根据自己的需求进行修改和调整。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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