mybatis 批量执行多条update语句

Posted 2023-04-22

请问你是怎么解决的

mysql没有提供直接的方法来实现批量，但可以使用case when语法来实现这个功能。
UPDATE course
SET name = CASE id
WHEN 1 THEN \'name1\'
WHEN 2 THEN \'name2\'
WHEN 3 THEN \'name3\'
END,
title = CASE id
WHEN 1 THEN \'New Title 1\'
WHEN 2 THEN \'New Title 2\'
WHEN 3 THEN \'New Title 3\'
END
WHERE id IN (1,2,3) 参考技术A 用foreatch就可以了，具体用法可参照mybatis官方文档 参考技术B 批量更新多条，一个UPDATE语句
update tableName where id in #Ids
<foreach collection="roleIds" item="item" index="index" open="("
separator="," close=")">
#item
</foreach> 参考技术C 在数据库链接语句后面加allowMultiQueries=true，更新语句之间用分号隔开 参考技术D 我觉得还是在后台循环执行

mybatis批量更新不同参数多条语句带分号update报错的解决方案

问题

在走接口的时候，需要使用mybtatis的批量更新，偷了个懒使用Foreach的形式拼接多个sql语句进行更新。结果在执行到这个sql的时候update一直报错

### Error updating database.  Cause: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near \'update xxxxxxxxxxxxxxxxx at line 1
### The error may exist in xxxxxxxxx.java (best guess)
### The error may involve xxxxxxxxxx.someaction-Inline
### The error occurred while setting parameters
### SQL: update xxxxxxxxxxxxxxx
### Cause: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near \'update invoice_check set company_id = \'1132\',pch = \'2021050610191505316062112345\' at line 1\\n; bad SQL grammar []; nested exception is java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near \'update xxxxxxxxxxxxxxx at line 1

　　

让我检查update左侧的语句，而左侧的语句是;，怎么会出问题，于是将sql打印出来查看

update xxx set xxx = xxx where id = x ; update xxx set xxx = xxx where id = x 

　　

直接扔到navicat里执行无误，但是在程序中就挂掉了

解决方案

在jdbc中加上一句

 

&allowMultiQueries=true

　　

就解决了
例如

jdbc:mysql://localhost/test?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8&useAffectedRows=true&allowMultiQueries=true