mapping的传参方式

Posted 2023-05-12

参考技术A 传递单个参数
传递单个参数时直接将parameterType设置成你传入的参数类型（Long），直接用“#”获得参数，参数名必须与Dao层参数名一致。

resultType是SQL查询结果返回的类型，Dao层接口返回是实体类，所以这里的resultType是实体类的路径（按住ctrl键，鼠标点击路径时可以直接进入实体类时路径正确）

map在Sql中的传参 模糊查询limit分页

jsp页面
sql传入map，需要用${},不能用#{}


    <select id="findAllByCountName" parameterType="java.util.Map" resultType="bean.ChuHuoDan" >

  　　　　<!-- SELECT * FROM chuhuodan WHERE siji LIKE  ‘%张%‘ ORDER BY createtime DESC limit 0,5; -->

    SELECT * FROM chuhuodan WHERE siji LIKE  ${moHuName} ORDER BY createtime DESC limit ${pageNum},${pageSize}

   </select>

serviceImpl层

  @Override
    public List<ChuHuoDan> findAllByCountName(String moHuName, Integer pageNum, Integer pageSize) {
        moHuName="‘%"+moHuName+"%‘";
        System.out.println (moHuName);
        map.put ( "moHuName",moHuName );
        map.put ( "pageNum" ,pageNum);
        map.put ( "pageSize",pageSize );
        return chuHuoDanMapper.findAllByCountName(map);
    }

 

 

Controller层

    @RequestMapping("findChuHuoDanByCountName")
    public String findChuHuoDanByCountName(Model model, String moHuName,
                                           @RequestParam(value = "pageNum" ,defaultValue = "1") Integer pageNum,
                                           @RequestParam(value = "pageSize",defaultValue ="5")Integer pageSize){
        if (pageNum==0){
            pageNum=1;
        }
        count = chuHuoDanService.findCount ();
        limitPage = (int)Math.ceil ( count / pageSize );
        allCH = chuHuoDanService.findAllByCountName (moHuName,(pageNum - 1) * pageSize, pageSize );
        model.addAttribute ( "moHuName",moHuName );
        model.addAttribute ( "list",allCH);
        model.addAttribute ("pageNum",pageNum);
        model.addAttribute ("firstPage",1);
        model.addAttribute ("lastPage",limitPage);
        return "show.jsp";
    }