04-自定义QueryWrapper与sql结合查询

核心技术点：

1. QueryWrapper 可以指定表的别名，但是要显式的字段，而不是 LambdaQueryWrapper的::获取字段
2. QueryWrapper 的入参使用 @Param(Constants.WRAPPER) QueryWrapper<Xxx> qw 接收
   • Constants.WRAPPER = "ew"; 且只能是这个值，不能使用其他值否则会因找不到ew而报错
3. QueryWrapper 接收到的入参使用 ${ew.customSqlSegment} 来进行拼接sql
4. 显式接收 Page 参数时，使用 @Param("offset") Page<Xxx> page 即 offset 来接收，自动追加sql

示例 service 方法

@Override
public Page<SendRecordListDTO> sendRecordList(SendRecordListQueryDTO dto) {
    QueryWrapper<RoomReportStatisticsEntity> lqw = new QueryWrapper<>();
    lqw.eq("rrs.wx_corp_id", dto.getWxCorpId());
    if (StrUtil.isNotEmpty(dto.getRoomName())) {
        lqw.like("rrs.room_name", dto.getRoomName());
    }
    if (StrUtil.isNotEmpty(dto.getPrincipalName())) {
        lqw.like("rrs.principal_user_name", dto.getPrincipalName());
    }
    List<OrderItem> orders = dto.getOrders();
    if (ObjUtil.isNotEmpty(orders)) {
        for (OrderItem order : orders) {
            if (order.isAsc()) {
                if ("sendCount".equals(order.getColumn())) {
                    lqw.orderByAsc("rrs.have_send_total");
                } else if ("pushTime".equals(order.getColumn())) {
                    lqw.orderByAsc("rrs.last_push_time");
                } else if ("sendDate".equals(order.getColumn())) {
                    lqw.orderByAsc("rrs.last_send_time");
                }
            } else {
                if ("sendCount".equals(order.getColumn())) {
                    lqw.orderByDesc("rrs.have_send_total");
                } else if ("pushTime".equals(order.getColumn())) {
                    lqw.orderByDesc("rrs.last_push_time");
                } else if ("sendDate".equals(order.getColumn())) {
                    lqw.orderByDesc("rrs.last_send_time");
                }
            }
        }
    } else {
        //默认排序方式：最后推送时间倒序
        lqw.orderByDesc("rrs.last_push_time");
    }
    Integer dateSearchType = dto.getDateSearchType();
    String beginDate = dto.getBeginDate();
    String endDate = dto.getEndDate();
    if (ObjUtil.isNotNull(dateSearchType) && StrUtil.isNotEmpty(beginDate) && StrUtil.isNotEmpty(endDate)) {
        if (1 == dateSearchType) {
            lqw.gt("rrs.last_push_time", beginDate);
            lqw.lt("rrs.last_push_time", endDate);
        } else {
            lqw.gt("rrs.last_send_time", beginDate);
            lqw.lt("rrs.last_send_time", endDate);
        }
    }
    Page<RoomReportStatisticsEntity> page = new Page<>(dto.getCurrent(), dto.getSize());
    List<SendRecordListDTO> resList = Lists.newArrayList();

    Page<RoomReportStatisticsEntity> pageResult = roomReportStatisticsService.selectEntityPage(
            lqw, dateSearchType, beginDate, endDate, page
    );
    log.info("pageResult -> {}", pageResult);
    if (ObjUtil.isNotEmpty(pageResult)) {
        List<RoomReportStatisticsEntity> records = pageResult.getRecords();
        if (ObjUtil.isNotEmpty(records)) {
            records.forEach(r -> {
                SendRecordListDTO sendRecordListDTO = new SendRecordListDTO();
                sendRecordListDTO.setRoomId(r.getRoomId());
                sendRecordListDTO.setRoomName(r.getRoomName());
                sendRecordListDTO.setProjectName(r.getSopName());
                sendRecordListDTO.setStepTaskName(r.getSopCurrentStep());
                sendRecordListDTO.setPrincipalUserId(r.getPrincipalUserId());
                sendRecordListDTO.setPrincipalName(r.getPrincipalUserName());
                sendRecordListDTO.setTemplateTypeCount(r.getNeedSendTotal());
                sendRecordListDTO.setSendCount(r.getHaveSendTotal());
                sendRecordListDTO.setPushTime(r.getLastPushTime());
                sendRecordListDTO.setSendDate(r.getLastSendTime());
                resList.add(sendRecordListDTO);
            });
        }
    }
    Page<SendRecordListDTO> resPage = new Page<>(dto.getCurrent(), dto.getSize());
    resPage.setTotal(pageResult.getTotal());
    resPage.setRecords(resList);
    return resPage;
}

示例 dao 方法

@Override
public Page<RoomReportStatisticsEntity> selectEntityPage(QueryWrapper<RoomReportStatisticsEntity> lqw,
                                                         Integer dateSearchType,
                                                         String beginDate,
                                                         String endDate,
                                                         Page<RoomReportStatisticsEntity> page) {
    return roomReportStatisticsDao.selectEntityPage(lqw, dateSearchType, beginDate, endDate, page);
}

    Page<RoomReportStatisticsEntity> selectEntityPage(@Param(Constants.WRAPPER) QueryWrapper<RoomReportStatisticsEntity> qw,
                                                      @Param("dateSearchType") Integer dateSearchType,
                                                      @Param("beginDate") String beginDate,
                                                      @Param("endDate") String endDate,
                                                      @Param("offset") Page<RoomReportStatisticsEntity> page);
}

示例 Mapper 方法

<select id="selectEntityPage" resultType="com...RoomReportStatisticsEntity">
        SELECT rrs.id,
               rrs.wx_corp_id,
               rrs.room_id,
               rrs.room_name,
               rrs.sop_name,
               rrs.sop_current_step,
               rrs.principal_user_id,
               rrs.principal_user_name,
               (SELECT COUNT(*)
                FROM room_report_file_record rrfr
                WHERE rrfr.wx_corp_id = rrs.wx_corp_id
                  AND rrfr.room_id = rrs.room_id
                    <choose>
                        <when test="dateSearchType == 1 and beginDate != null and beginDate != '' and endDate != null and endDate != ''">
                            AND rrfr.update_date BETWEEN '${beginDate}' AND '${endDate}'
                        </when>
                    </choose>
               ) AS need_send_total,
               (SELECT COUNT(*)
                FROM room_report_send_record rrsr
                WHERE rrsr.wx_corp_id = rrs.wx_corp_id
                  AND rrsr.room_id = rrs.room_id
                    <choose>
                        <when test="dateSearchType == 2 and beginDate != null and beginDate != '' and endDate != null and endDate != ''">
                            AND rrsr.update_date BETWEEN '${beginDate}' AND '${endDate}'
                        </when>
                    </choose>
               ) AS have_send_total,
               rrs.last_push_time,
               rrs.last_send_time,
               rrs.create_date,
               rrs.update_date
        FROM room_report_statistics rrs
        <if test="ew != null">
            ${ew.customSqlSegment}
        </if>
    </select>