查询文章列表

package com.heima.wemedia.service.impl;


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.heima.model.common.dtos.PageResponseResult;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.wemedia.dtos.WmNewsPageReqDto;
import com.heima.model.wemedia.pojos.WmNews;
import com.heima.utils.common.thread.WmThreadLocalUtil;
import com.heima.wemedia.mapper.WmNewsMapper;
import com.heima.wemedia.service.WmNewsService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
@Slf4j
@Transactional
public class WmNewsServiceImpl  extends ServiceImpl<WmNewsMapper, WmNews> implements WmNewsService {


    /**
     * 条件查询文章列表
     * @param dto
     * @return
     */
    @Override
    public ResponseResult findList(WmNewsPageReqDto dto) {
        //1、检查参数
        //分页检查
        dto.checkParam();
        //2、分页条件查询
        IPage page = new Page(dto.getPage(), dto.getSize());
        LambdaQueryWrapper<WmNews> lambdaQueryWrapper = new LambdaQueryWrapper();
        //状态精确查询
        if(dto.getStatus() != null){
            lambdaQueryWrapper.eq(WmNews::getStatus, dto.getStatus());
        }
        //频道精确查询
        if(dto.getChannelId() != null){
            lambdaQueryWrapper.eq(WmNews::getChannelId, dto.getChannelId());
        }
        //时间范围查询
        if(dto.getBeginPubDate() != null && dto.getEndPubDate() != null){
            lambdaQueryWrapper.between(WmNews::getPublishTime, dto.getBeginPubDate(), dto.getEndPubDate());
        }
        //关键字模糊查询
        if(StringUtils.isNotBlank(dto.getKeyword())){
            lambdaQueryWrapper.like(WmNews::getTitle, dto.getKeyword());
        }
        //查询当前登录人的文章
        lambdaQueryWrapper.eq(WmNews::getUserId, WmThreadLocalUtil.getUser().getId());
        //按照发布时间倒叙
        lambdaQueryWrapper.orderByDesc(WmNews::getPublishTime);
        
        page = page(page, lambdaQueryWrapper);
        
        //3、结果返回
        ResponseResult responseResult = new PageResponseResult(dto.getPage(), dto.getSize(), (int)page.getTotal());
        responseResult.setData(page.getRecords());
        return responseResult;
    }
}