文章列表分页查询（条件分页）

 

pojo.PageBean

package com.lin.springboot01.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.List;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class PageBean {
    private Long total; //总条数
    private List items; //当前页数据集合
}

ArticleController

    @GetMapping
    public Result> list(
            Integer pageNum,
            Integer pageSize,
           @RequestParam(required = false) Integer categoryId,
            @RequestParam(required = false) String state
    ){
        PageBean
 pb = articleService.list(pageNum,pageSize,categoryId,state);
        return Result.success(pb);
    }

 ArticleService

    //条件分页列表查询
    PageBean
 list(Integer pageNum, Integer pageSize, Integer categoryId, String state);

ArticleServiceImpl

    @Override
    public PageBean
 list(Integer pageNum, Integer pageSize, Integer categoryId, String state) {
        //1.创建pagebean对象
        PageBean
 pb = new PageBean<>();
        //2.开启分页查询
        PageHelper.startPage(pageNum,pageSize);
        //3.调用mapper
        Map map = ThreadLocalUtil.get();
        Integer userId = (Integer) map.get("id");
        List
 as = articleMapper.list(userId,categoryId,state);
        //Page中提供了方法，可以获取PageHelper分页查询后得到的总记录条数和当前页数据
        Page
 p = (Page
) as;
        //把数据填充到PageBean对象中
        pb.setTotal(p.getTotal());
        pb.setItems(p.getResult());
        return pb;

    }

ArticleMapper

    List
 list(Integer userId, Integer categoryId, String state);

需要拼接sql语句，所有我们用ArticleMapper.xml中写拼接代码。

注意：resours下的mapper结构目录一定要跟上面的mapper结构目录一样。！！！

 ArticleMapper.xml

    
    
        select * from article
        
            
                category_id = #{categoryId}
            
            
                and state = #{state}
            
            and create_user=#{userId}
        
    

完成：