Mybatis/Mybatis-plus实现多表查询(源码奉上&细致教学)

<dependencies> <dependency> <groupId></groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId></groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId></groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId></groupId> <artifactId>mybatis</artifactId> <version>3.5.7</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency