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技术探究/JAVA/Mybatis Mybatis plus.md

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+### mybatis xxx join 做连接查询
+引入以下依赖
+```xml
+<dependency>  
+    <groupId>com.github.yulichang</groupId>  
+    <artifactId>mybatis-plus-join-boot-starter</artifactId>  
+    <version>1.4.9</version>  
+</dependency>
+```
+
+``` JAVA
+
+import com.baomidou.mybatisplus.extension.service.IService;
+to
+import com.github.yulichang.base.MPJBaseService;
+
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+to
+import com.github.yulichang.base.MPJBaseMapper;
+
+LambdaQueryWrapper
+to
+MPJLambdaWrapper
+
+```
+
+### 批量 性能 优化
+> https://developer.aliyun.com/article/1055592
+```
+rewriteBatchedStatements=true
+```