MyBatis-Plus学习笔记(3)：分页查询

依赖配置可参考：MyBatis-Plus学习笔记(1)：环境搭建以及基本的CRUD操作

分页配置

@Configuration
public class PlusConfig {
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        // 开启 count 的 join 优化,只针对部分 left join
        paginationInterceptor.setCountSqlParser(new JsqlParserCountOptimize(true));
        return paginationInterceptor;
    }
}

通用Mapper查询分页

    @Test
    public void testSelectPage(){
        //分页对象，构造函数传入当前页数和每页条数
        Page selectPage = new Page(1, 10);
        //是否查询总条数，默认为true，也可以通过构造函数传入
        //selectPage.setSearchCount(false);

        //封装查询条件
        Wrapper wrapper = new QueryWrapper().gt("id", 0).orderByDesc("id");

        //调用通用Mapper
        Page resultPage = userMapper.selectPage(selectPage, wrapper);

        System.out.println("总条数：" + resultPage.getTotal());
        System.out.println("列表：" + resultPage.getRecords());

        //true，返回的对象和查询时传入的对象是同一个对象
        System.out.println(selectPage.equals(resultPage));
    }

自定义Mapper查询分页

UserMapper.java：

package com.cf.plusdm.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.cf.plusdm.entity.User;

public interface UserMapper extends BaseMapper {
    IPage getUserList(Page page);
}

UserMapper.xml：

    
    
        
        
        
        
    

    
    
        id, real_name, email, phone
    

    
        SELECT
        
        FROM tb_user
    

使用：

    @Test
    public void testSelectPageXml(){
        Page resultPage = new Page(1, 10);
        userMapper.getUserList(resultPage);

        System.out.println("总条数：" + resultPage.getTotal());
        System.out.println("列表：" + resultPage.getRecords());
    }

参考：分页插件