Question

（1）mapper 接口以及 xml

/**
 * @Description: 系统通告表
 * @Author: jeecg-boot
 * @Date:  2019-01-02
 * @Version: V1.0
 */
public interface SysAnnouncementMapper extends BaseMapper<SysAnnouncement> {


    List<SysAnnouncement> querySysCementListByUserId(Page<SysAnnouncement> page, String userId,String msgCategory);

}

这里要注意的是，这个 Page page 是必须要有的，否则 Mybatis-Plus 无法为你实现分页。

<resultMap id="SysAnnouncement" type="org.jeecg.modules.system.entity.SysAnnouncement" >
        <result column="id" property="id" jdbcType="VARCHAR"/>
        <result column="titile" property="titile" jdbcType="VARCHAR"/>
        <result column="msg_content" property="msgContent" jdbcType="VARCHAR"/>
        <result column="start_time" property="startTime" jdbcType="TIMESTAMP"/>
        <result column="end_time" property="endTime" jdbcType="TIMESTAMP"/>
        <result column="sender" property="sender" jdbcType="VARCHAR"/>
        <result column="priority" property="priority" jdbcType="VARCHAR"/>
        <result column="msg_category" property="msgCategory" jdbcType="VARCHAR"/>
        <result column="msg_type" property="msgType" jdbcType="VARCHAR"/>
        <result column="send_status" property="sendStatus" jdbcType="VARCHAR"/>
        <result column="send_time" property="sendTime" jdbcType="VARCHAR"/>
        <result column="cancel_time" property="cancelTime" jdbcType="VARCHAR"/>
        <result column="del_flag" property="delFlag" jdbcType="VARCHAR"/>
        <result column="create_by" property="createBy" jdbcType="VARCHAR"/>
        <result column="create_time" property="createTime" jdbcType="TIMESTAMP"/>
        <result column="update_by" property="updateBy" jdbcType="VARCHAR"/>
        <result column="update_time" property="updateTime" jdbcType="TIMESTAMP"/>
        <result column="user_ids" property="userIds" jdbcType="VARCHAR"/>
    </resultMap>


    <select id="querySysCementListByUserId" parameterType="String"  resultMap="SysAnnouncement">
       select sa.* from sys_announcement sa,sys_announcement_send sas 
       where sa.id = sas.annt_id 
       and sa.send_status = '1'
       and sa.del_flag = '0'
       and sas.user_id = #{userId}
       and sa.msg_category = #{msgCategory}
       and sas.read_flag = '0'
    </select>

（3） service 实现

@Override
    public Page<SysAnnouncement> querySysCementPageByUserId(Page<SysAnnouncement> page, String userId,String msgCategory) {
         return page.setRecords(sysAnnouncementMapper.querySysCementListByUserId(page, userId, msgCategory));
    }

（4） controller 实现

@RequestMapping(value = "/list", method = RequestMethod.GET)
    public Result<Page<SysAnnouncement>> queryPageList(SysAnnouncement sysAnnouncement,
                                      @RequestParam(name="pageNo", defaultValue="1") Integer pageNo,
                                      @RequestParam(name="pageSize", defaultValue="10") Integer pageSize,
                                      HttpServletRequest req) {
        Result<Page<SysAnnouncement>> result = new Result<Page<SysAnnouncement>>();
        Page<SysAnnouncement> pageList = new Page<SysAnnouncement>(pageNo,pageSize);
        pageList = sysAnnouncementService.querySysCementPageByUserId(pageList,"","1");//通知公告消息
        log.info("查询当前页："+pageList.getCurrent());
        log.info("查询当前页数量："+pageList.getSize());
        log.info("查询结果数量："+pageList.getRecords().size());
        log.info("数据总数："+pageList.getTotal());
        result.setSuccess(true);
        result.setResult(pageList);
        return result;
    }