springboot整合mybatis-plus实现多表分页查询的示例代码

1.新建一个springboot工程

2.需要导入mybatis和mybatis-plus的依赖文件

<dependency> <groupId> com.baomidou </groupId> <artifactId> mybatis-plus-boot-starter </artifactId> <version> 3.1.1 </version> </dependency> <dependency> <groupId> org.mybatis.spring.boot </groupId> <artifactId> mybatis-spring-boot-starter </artifactId> <version> 2.0.1 </version> </dependency>

3.application.yml配置文件

server : port : 8080 spring : datasource : url : jdbc : mysql : //localhost:3306/mybatisplus?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&useSSL=false&serverTimezone=UTC username : root password : 数据库密码 mybatis : mapper - locations : classpath *: mapper /*.xml   mybatis-plus: mapper-locations: classpath:/mapper/*Mapper.xml logging: level: com.tuanzi.*: debug

4.首先我们需要写一个类来配置分页插件

省略 import @EnableTransactionManagement @Configuration @MapperScan ( "com.tuanzi.*.mapper*" ) public class MybatisPlusConfig {   /** * 分页插件 */ @Bean public PaginationInterceptor paginationInterceptor (){ return new PaginationInterceptor (); } }

5.controller类

@RestController @RequestMapping ( "/user" ) public class UserController {   @Autowired UserService userService ;   /** * 多表关联，分页查询(1对1) * @param page * @return */ @RequestMapping ( "/findAll" ) public Result < IPage < User >> findAll ( @RequestBody Page < User > page ){   return userService . pages ( page );   }   /** * 多表关联，分页查询(1对多) * @param page * @return */ @RequestMapping ( "/selectAll" ) public Result < IPage < User >> selectAll ( @RequestBody Page < User > page ){   return userService . pageList ( page );   } }

6.service类

public interface UserService extends IService < User > {   Result < IPage < User >> pages ( Page < User > page );   Result < IPage < User >> pageList ( Page < User > page ); }

7.service实现类

@Service public class UserServiceImpl extends ServiceImpl < UserMapper , User > implements UserService {   @Autowired UserMapper userMapper ; @Override public Result < IPage < User >> pages ( Page < User > page ) { IPage < User > userIPage = userMapper . Pages ( page ); return Result . getSuccess ( "分页查询成功" , userIPage ); }   @Override public Result < IPage < User >> pageList ( Page < User > page ) { IPage < User > userIPage = userMapper . pageList ( page ); return Result . getSuccess ( "分页查询成功" , userIPage ); } }

8.mapper接口

注意!!: 如果入参是有多个,需要加注解指定参数名才能在xml中取值

@Mapper @Repository public interface UserMapper extends BaseMapper < User > {   IPage < User > Pages ( @Param ( "page" ) Page < User > page );   IPage < User > pageList ( @Param ( "page" ) Page < User > page ); }

9.xml文件

一对一关联

<!-- 一对一 通用查询映射结果 --> <resultMap id = "BaseResultMap1" type = "com.tuanzi.user.entity.User" > <result column = "id" property = "id" /> <result column = "name" property = "name" /> <result column = "age" property = "age" /> <result column = "email" property = "email" /> <!--assocication 一对一关联查询 可以指定联合的JavaBean对象 property="work"指定哪个属性是联合的对象 javaType:指定这个属性对象的类型 --> <association property = "work" javaType = "com.tuanzi.user.entity.Work" > <result column = "id" property = "id" /> <result column = "position" property = "position" /> <result column = "user_id" property = "userId" /> </association> </resultMap>

一对多关联

<!-- 一对多 通用查询映射结果 --> <resultMap id = "BaseResultMap2" type = "com.tuanzi.user.entity.User" > <result column = "id" property = "id" /> <result column = "name" property = "name" /> <result column = "age" property = "age" /> <result column = "email" property = "email" /> <!-- collection定义关联结合类型的属性的封装规则 property="workList"指定哪个属性是联合的对象 ofType：指定集合里面元素的类型 --> <collection property = "workList" ofType = "com.tuanzi.user.entity.Work" > <result column = "id" property = "id" /> <result column = "position" property = "position" /> <result column = "user_id" property = "userId" /> </collection> </resultMap>

SQL语句：

<select id = "Pages" resultMap = "BaseResultMap1" > select a.id id,a.name name,a.age age,a.email email,b.position position,b.user_id user_id from user a LEFT JOIN work b on a.id=b.user_id </select> <select id = "pageList" resultMap = "BaseResultMap2" > select a.id id,a.name name,a.age age,a.email email,b.position position,b.user_id user_id from user a LEFT JOIN work b on a.id=b.user_id </select>

10.这样就基本完成了！我这里省略了实体类

我们运行一下，用postman测试一下结果
这里我们需要传2个参数，当然我们也可以不用传，因为mybatis-plus有默认值
来看下mybatis-plus的page源码

效果图：

最后附赠源码地址：demo

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原文链接：https://blog.csdn.net/weixin_42370891/article/details/93061955

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