技術標籤：java

實際上是穿了一個map給 Dao層

        int papercount=0;
        int readcount=0;
        int sharecount=0;
        //
        List<String> paperIds = new ArrayList<>();
        for (ShopPaper shopPaper : shopPapers) {
            paperIds.add(shopPaper.getPaperId());
        }
        HashMap<
 
String, List> map1 = new HashMap<>();  //！！！
        map1.put("paperIds",paperIds);
        ShopPaperPraise shopPaperPraise = shopPaperService.selectPraiseSum(map1);
        papercount=paperIds.size();
        readcount=shopPaperPraise.getReadNum();
        sharecount=shopPaperPraise.
 
getShareNum();

 /**
     * 根據電報id集合返回閱讀分享的總和
     * */
    ShopPaperPraise selectPraiseSum(Map map);

foreach collection中的paperIds是穿過來map的key

<!--  select sum(read_num) read_num, sum(share_num) share_num from is_shop_paper_praise where paper_id in('29','22')-->
  <select id="selectPraiseSum"
 
 parameterType="map" resultType="com.ovopark.shoppaper.model.ShopPaperPraise">
    select
    sum(read_num) read_num,
    sum(share_num) share_num  from is_shop_paper_praise
     <where>
       <foreach collection="paperIds" item="paperId" open="paper_id in(" close=")" separator=",">
               #{paperId}
       </foreach>
     </where>
  </select>