自定義sql分頁實現 === ### （1）mapper 接口以及 xml ``` /** * @Description: 系統通告表 * @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); } ``` 這里要注意的是，這個 Page page 是必須要有的，否則 Mybatis-Plus 無法為你實現分頁。 ``` <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 實現 ``` @Override public Page<SysAnnouncement> querySysCementPageByUserId(Page<SysAnnouncement> page, String userId,String msgCategory) { return page.setRecords(sysAnnouncementMapper.querySysCementListByUserId(page, userId, msgCategory)); } ``` ### （4） controller 實現 ``` @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("查詢當前頁："+pageList.getCurrent()); log.info("查詢當前頁數量："+pageList.getSize()); log.info("查詢結果數量："+pageList.getRecords().size()); log.info("數據總數："+pageList.getTotal()); result.setSuccess(true); result.setResult(pageList); return result; } ```