third_codes/mybatis-plus-join
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admin 2021-02-02 11:44:38 +08:00
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@ -54,16 +54,21 @@ MyBaseServiceImpl 继承了ServiceImpl,同样添加了以上方法
## 核心类 MyQueryWrapper, MyLambdaQueryWrapper和MyJoinLambdaQueryWrapper
[->区别](https://gitee.com/best_handsome/mybatis-plus-join/wikis/%E8%AF%B4%E6%98%8E)
|-|MyQueryWrapper|MyLambdaQueryWrapper|MyJoinLambdaQueryWrapper|
|---|---|---|---|
|select(String)|支持|支持|不支持|
|select(lambda)|不支持|仅支持主表lambda|所有表lambda|
|条件String|支持|不支持|不支持|
|条件lambda|不支持|仅支持主表lambda|所有表lambda|
## MyQueryWrapper和MyLambdaQueryWrapper
MyQueryWrapper相当于mp的QueryWrapper
MyQueryWrapper相当于mp的QueryWrapper
MyLambdaQueryWrapper相当于mp的LambdaQueryWrapper
两者可以无缝切换
MyQueryWrapper.lambda() -> MyLambdaQueryWrapper
MyLambdaQueryWrapper.stringQuery() -> MyQueryWrapper
MyLambdaQueryWrapper.stringQuery() -> MyQueryWrapper
## MyQueryWrapper和MyLambdaQueryWrapper
### 简单的3表查询