java实现日报表、月报表统计，没数据补0

产品需求：

1、日报表

2、月报表

需求点： 前端传日期或月份区间，当数据库中指定的日期或月份没数据时也需要界面显示，但领取人数和使用人数需要自动补齐0；
举例：2020-11-28、2020-11-29，数据库中没数据，但也需要在界面显示，领取人数和使用人数为0；

思路很重要

1、首先根据前端传来的时间区间，查询出区间中所有的日期或月份；
2、然后循环日期或月份和数据库查询返回的List<实体对象>的日期或月份进行匹配；
2.1、不存在则在List<实体对象>中新增一条实体对象数据；
3、最后统一把处理后的List<实体对象>返回前端；

sql语句（后面Mapper.xml中全部详细列出）

注：这里是Mysql数据库，以日报表为例，** 月报表则是将 DATE_FORMAT格式修改为 %Y-%m 即可 **

<!-- 根据日期分组查询 “领取人数” 和 “使用人数”，然后将两个Sql查询结果汇总 -->SELECTt.days,sum( t.receiveQty ) AS receiveQty,sum( t.userQty ) AS userQty
FROM(<!-- 领取人数 -->SELECTDATE_FORMAT( r.created_time, '%Y-%m-%d' ) AS days,count( r.id ) AS receiveQty,0 AS userQty FROMdg_experience_receive rLEFT JOIN dg_experience_order o ON r.user_id = o.user_id WHEREDATE_FORMAT( r.created_time, '%Y-%m-%d' ) >= '2020-11-01' AND DATE_FORMAT( r.created_time, '%Y-%m-%d' ) <= '2020-12-16' GROUP BYdays UNION ALL<!-- 使用人数 -->SELECTDATE_FORMAT( r.created_time, '%Y-%m-%d' ) AS days,0 AS receiveQty,count( r.id ) AS userQty FROMdg_experience_receive rJOIN dg_experience_order o ON r.user_id = o.user_id WHEREr.is_used = 1 AND DATE_FORMAT( r.created_time, '%Y-%m-%d' ) >= '2020-11-01' AND DATE_FORMAT( r.created_time, '%Y-%m-%d' ) <= '2020-12-16' GROUP BYdays ) t
GROUP BYdays
ORDER BYdays DESC;

请求实体

@Data
public class DepositExperienceDayReq {/*** 开始日期*/@NotBlank(message = "起始日期不能为空！")private String startDate;/*** 结束日期*/@NotBlank(message = "截至日期不能为空！")private String endDate;
}

返回实体

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class DepositExperienceDayRes {/*** 日期*/private String days;/*** 领取人数*/private Long receiveQty;/*** 使用人数*/private Long userQty;
}

Controller

/*** 体验金日报表--查询*/@PostMapping("/experienceDay/list")public ResponseData listExperienceDayByReq(@Valid @RequestBody DepositExperienceDayReq experienceDayReq){return ResponseData.success(experienceOrderService.listExperienceDayByReq(experienceDayReq));}/*** 体验金月报表--查询*/@PostMapping("/experienceMonth/list")public ResponseData listExperienceMonthByReq(@Valid @RequestBody DepositExperienceDayReq experienceDayReq){return ResponseData.success(experienceOrderService.listExperienceMonthByReq(experienceDayReq));}

Service

/*** 运营报表--体验金日报表--查询* @param experienceDayReq* @return*/List<DepositExperienceDayRes> listExperienceDayByReq(DepositExperienceDayReq experienceDayReq);/*** 运营报表--体验金月报表--查询* @param experienceDayReq* @return*/List<DepositExperienceDayRes> listExperienceMonthByReq(DepositExperienceDayReq experienceDayReq);

ServiceImpl(这里是重点，需要看一下)

注： DateUtil使用的是 hutool-core-5.0.6.jar

    /*** 运营报表--体验金日报表--查询* @param experienceDayReq* @return*/@Overridepublic List<DepositExperienceDayRes> listExperienceDayByReq(DepositExperienceDayReq experienceDayReq) {// 首先根据前端传来的时间区间，查询出区间中所有的日期；List<Date> lDate = findDates(DateUtil.parseDate(experienceDayReq.getStartDate()), DateUtil.parseDate(experienceDayReq.getEndDate()), Calendar.DAY_OF_MONTH);if (CollectionUtils.isEmpty(lDate)){return null;}List<DepositExperienceDayRes> experienceDayResList = baseMapper.listExperienceDayByReq(experienceDayReq);for (Date date : lDate){// 当前日期不存在则新增String dateStr = DateUtil.format(date, "yyyy-MM-dd");// 进行匹配if(!experienceDayResList.stream().filter(item -> dateStr.equals(item.getDays())).findAny().isPresent()){DepositExperienceDayRes experienceDayRes = DepositExperienceDayRes.builder().days(dateStr).receiveQty(0L).userQty(0L).build();experienceDayResList.add(experienceDayRes);}}List<DepositExperienceDayRes> collect = experienceDayResList.stream().sorted(Comparator.comparing(DepositExperienceDayRes::getDays).reversed()).collect(Collectors.toList());return collect;}/*** 运营报表--体验金月报表--查询* @param experienceDayReq* @return*/@Overridepublic List<DepositExperienceDayRes> listExperienceMonthByReq(DepositExperienceDayReq experienceDayReq) {// 首先根据前端传来的时间区间，查询出区间中所有的月份；DateTime startDate = DateUtil.parse(experienceDayReq.getStartDate(), "yyyy-MM");DateTime endDate = DateUtil.parse(experienceDayReq.getEndDate(), "yyyy-MM");List<Date> lDate = findDates(startDate, endDate, Calendar.MONTH);if (CollectionUtils.isEmpty(lDate)){return null;}List<DepositExperienceDayRes> experienceDayResList = baseMapper.listExperienceMonthByReq(experienceDayReq);for (Date date : lDate){// 当前日期不存在则新增String dateStr = DateUtil.format(date, "yyyy-MM");// 进行匹配if(!experienceDayResList.stream().filter(item -> dateStr.equals(item.getDays())).findAny().isPresent()){DepositExperienceDayRes experienceDayRes = DepositExperienceDayRes.builder().days(dateStr).receiveQty(0L).userQty(0L).build();experienceDayResList.add(experienceDayRes);}}List<DepositExperienceDayRes> collect = experienceDayResList.stream().sorted(Comparator.comparing(DepositExperienceDayRes::getDays).reversed()).collect(Collectors.toList());return collect;}/*** 获取指定时间区间的所有数据（包含日期和月份）* @param dBegin* @param dEnd* @param rule 日历规则 如：Calendar.DAY_OF_MONTH* @return*/public static List<Date> findDates(Date dBegin, Date dEnd, int rule) {List lDate = new ArrayList();if (dEnd.before(dBegin)){return lDate;}lDate.add(dBegin);Calendar calBegin = Calendar.getInstance();// 使用给定的 Date 设置此 Calendar 的时间calBegin.setTime(dBegin);Calendar calEnd = Calendar.getInstance();// 使用给定的 Date 设置此 Calendar 的时间calEnd.setTime(dEnd);// 测试此日期是否在指定日期之后while (dEnd.after(calBegin.getTime())) {// 根据日历的规则，为给定的日历字段添加或减去指定的时间量calBegin.add(rule, 1);lDate.add(calBegin.getTime());}return lDate;}

Mapper.xml

 <!-- 日报表 -->
<select id="listExperienceDayByReq"resultType="com.dg.mall.financial.vo.res.report.operation.DepositExperienceDayRes">SELECTt.days,sum(t.receiveQty) as receiveQty,sum(t.userQty) as userQtyFROM (SELECTDATE_FORMAT(r.created_time , '%Y-%m-%d' ) AS days,count(r.id) as receiveQty,0 as userQtyFROM dg_experience_receive rLEFT JOIN dg_experience_order o on r.user_id = o.user_id<where><if test="experienceDayReq.startDate != null and experienceDayReq.startDate != ''"><![CDATA[ AND DATE_FORMAT(r.created_time, '%Y-%m-%d') >= #{experienceDayReq.startDate} ]]></if><if test="experienceDayReq.endDate != null and experienceDayReq.endDate != ''"><![CDATA[ AND DATE_FORMAT(r.created_time, '%Y-%m-%d') <= #{experienceDayReq.endDate} ]]></if></where>GROUP BY daysUNION ALLSELECTDATE_FORMAT(r.created_time , '%Y-%m-%d' ) AS days,0 as receiveQty,count(r.id) as userQtyFROM dg_experience_receive rJOIN dg_experience_order o on r.user_id = o.user_id<where>AND r.is_used = 1<if test="experienceDayReq.startDate != null and experienceDayReq.startDate != ''"><![CDATA[ AND DATE_FORMAT(r.created_time, '%Y-%m-%d') >= #{experienceDayReq.startDate} ]]></if><if test="experienceDayReq.endDate != null and experienceDayReq.endDate != ''"><![CDATA[ AND DATE_FORMAT(r.created_time, '%Y-%m-%d') <= #{experienceDayReq.endDate} ]]></if></where>GROUP BY days) tGROUP BY daysorder by days desc</select><!-- 月报表 --><select id="listExperienceMonthByReq"resultType="com.dg.mall.financial.vo.res.report.operation.DepositExperienceDayRes">SELECTt.days,sum(t.receiveQty) as receiveQty,sum(t.userQty) as userQtyFROM (SELECTDATE_FORMAT(r.created_time , '%Y-%m' ) AS days,count(r.id) as receiveQty,0 as userQtyFROM dg_experience_receive rLEFT JOIN dg_experience_order o on r.user_id = o.user_id<where><if test="experienceDayReq.startDate != null and experienceDayReq.startDate != ''"><![CDATA[ AND DATE_FORMAT(r.created_time, '%Y-%m') >= #{experienceDayReq.startDate} ]]></if><if test="experienceDayReq.endDate != null and experienceDayReq.endDate != ''"><![CDATA[ AND DATE_FORMAT(r.created_time, '%Y-%m') <= #{experienceDayReq.endDate} ]]></if></where>GROUP BY daysUNION ALLSELECTDATE_FORMAT(r.created_time , '%Y-%m' ) AS days,0 as receiveQty,count(r.id) as userQtyFROM dg_experience_receive rJOIN dg_experience_order o on r.user_id = o.user_id<where>AND r.is_used = 1<if test="experienceDayReq.startDate != null and experienceDayReq.startDate != ''"><![CDATA[ AND DATE_FORMAT(r.created_time, '%Y-%m') >= #{experienceDayReq.startDate} ]]></if><if test="experienceDayReq.endDate != null and experienceDayReq.endDate != ''"><![CDATA[ AND DATE_FORMAT(r.created_time, '%Y-%m') <= #{experienceDayReq.endDate} ]]></if></where>GROUP BY days) tGROUP BY daysorder by days desc</select>

PostMan结果展示：

之前是将该文章放在简书中，后面发现简书的页面编辑功能没有这里多，今天就把它移过来了。

下一篇将会记录使用：Elasticsearch(简称ES)实现日报表、月报表、年报表统计，没数据补0功能
https://blog.csdn.net/JRocks/article/details/113842092