MyBatisPlus分页的同时指定排序规则说明

@Configuration
@ConditionalOnClass(value = {PaginationInterceptor.class})
public class MybatisPlusConfig {

 /**
 * 分页插件
 * @return
 */
 @Bean
 public PaginationInterceptor paginationInterceptor() {
 PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
 return paginationInterceptor; //返回分布拦截器
 }

}

public PageBean<Category> listPage(int pageNum, int pageSize) {
 IPage<Category> page = new Page<>(pageNum,pageSize);
 QueryWrapper<Category> queryWrapper = new QueryWrapper<>();
 queryWrapper.eq("state",1)
 .orderByDesc("level");
 IPage<Category> categoryIPage = categoryMapper.selectPage(page, queryWrapper);
 return PageBean.init(categoryIPage);
}

public PageBean<Category> listPage(int pageNum, int pageSize) {
 IPage<Category> page = new Page<>(pageNum,pageSize);
 QueryWrapper<Category> queryWrapper = new QueryWrapper<>();
 queryWrapper.eq("state",1)
 .orderBy("level")
 .last("desc"); // 手动把sql拼接到最后(有sql注入的风险,请谨慎使用)
 IPage<Category> categoryIPage = categoryMapper.selectPage(page, queryWrapper);
 return PageBean.init(categoryIPage);
}

<parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId>
 <version>2.0.8.RELEASE</version>
 <relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
 <java.version>1.8</java.version>
</properties>
<dependencies>
 ...
 <!-- mysql -->
 <dependency>
 <groupId>mysql</groupId>
 <artifactId>mysql-connector-java</artifactId>
 <scope>runtime</scope>
 <version>5.1.48</version>
 </dependency>

 <!-- mybatis -->
 <dependency>
 <groupId>com.baomidou</groupId>
 <artifactId>mybatis-plus-boot-starter</artifactId>
 <version>3.2.0</version>
 </dependency>
 ...
</dependencies>

Page<UserVO> page = new Page<>(pageNum, pageSize); // 构建分页对象
page.setOrders(List<OrderItem>); // 设入排序项
userMapper.selectList(page); // 调用mybatis进行查询

<mapper>
 <select id="selectList" resultType="com.demo.springboottest.vo.UserVO">
 SELECT CONCAT(u.id, '/', u.group) AS groups FROM `user` u
 </select>
</mapper>