按日，周，年统计，无的数据补充0-编程知识

按日，周，年统计，无的数据补充0

需求：按日-周-年统计。统计涉及到3张表数据。
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写sql。先把3张表数据摘取出来，只需对3张表的时间做分组统计即可。
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按日统计

select DAY(dateff) as time,IFNULL(count(id),0)as num
from(select create_time as dateff,id as id from cz_taxi_orders UNION ALL
select create_time as dateff,id as id from ctky_passenger_transport_order UNION ALL
select pay_time as dateff,id as id from bus_order) as a
GROUP BY time

按年统计

#按年 需求:统计最近十年数据
select YEAR(dateff) as time,IFNULL(count(id),0)as num
from(select create_time as dateff,id as id from cz_taxi_orders UNION ALL
select create_time as dateff,id as id from ctky_passenger_transport_order UNION ALL
select pay_time as dateff,id as id from bus_order) as a
WHERE YEAR(dateff)>year(now())-10
GROUP BY time

按周统计

select 
CASE temp.time 
WHEN 1 THEN '星期一' 
WHEN 2 THEN '星期二' 
WHEN 3 THEN '星期三' 
WHEN 4 THEN '星期四' 
WHEN 5 THEN '星期五' 
WHEN 6 THEN '星期六' 
WHEN 7 THEN '星期天' 
end as time,
IFNULL(temp2.num,0) as num 
from(
select 1 as time UNION all
SELECT 2 UNION all
SELECT 3 UNION all
SELECT 4 UNION all
SELECT 5 UNION all
SELECT 6 UNION all
SELECT 7) as temp
LEFT JOIN 
(select ifNULL(count(id),0) as num, 
CASE WEEKDAY(dateff) 
WHEN 0 THEN '1' 
WHEN 1 THEN '2' 
WHEN 2 THEN '3' 
WHEN 3 THEN '4' 
WHEN 4 THEN '5' 
WHEN 5 THEN '6' 
WHEN 6 THEN '7' 
END as `time` 
from(
SELECT create_time as dateff,id as id FROM cz_taxi_orders UNION ALL
SELECT create_time as dateff,id as id FROM ctky_passenger_transport_order UNION ALL
SELECT pay_time as dateff,id as id FROM bus_order) as a 
GROUP BY `time`) as temp2
ON temp.time = temp2.time 
ORDER BY temp.time asc;

组装动态sql。

<select id="queryPassengerFlow" resultType="com.xxxCockpitPassengerFlowChartVo"><if test="type=='WEEK'">selectCASE temp.timeWHEN 1 THEN '星期一'WHEN 2 THEN '星期二'WHEN 3 THEN '星期三'WHEN 4 THEN '星期四'WHEN 5 THEN '星期五'WHEN 6 THEN '星期六'WHEN 7 THEN '星期天'end as time,IFNULL(temp2.num,0) as numfrom(select 1 as time UNION all select 2 UNION allselect 3 UNION all select 4 UNION allselect 5 UNION all select 6 UNION allselect 7) as tempLEFT JOIN(select ifNULL(count(id),0) as num,CASE WEEKDAY(dateff)WHEN 0 THEN '1'WHEN 1 THEN '2'WHEN 2 THEN '3'WHEN 3 THEN '4'WHEN 4 THEN '5'WHEN 5 THEN '6'WHEN 6 THEN '7'END as `time`</if><if test="type=='DAY'">select count(id) as num,DAY(dateff) as `time`</if><if test="type=='YEAR'">select YEAR(dateff) as `time`,count(id) as num</if>from(select create_time as dateff,id as id from cz_taxi_orders UNION ALLselect create_time as dateff,id as id from ctky_passenger_transport_order UNION ALLselect pay_time as dateff,id as id from bus_order) as a<if test="type=='WEEK'">GROUP BY `time`) as temp2on temp.time = temp2.timeORDER BY temp.time asc</if><if test="type=='DAY'">GROUP BY `time`</if><if test="type=='YEAR'">WHERE (YEAR(dateff))>year(now())-10GROUP BY `time`</if></select>

剩余的年，日，用java代码补充。

@Overridepublic R queryPassengerFlow(String type) {//一开始加载，不输入默认按天if (type==null){type="DAY";}List<CockpitPassengerFlowChartVo> list = cockpitChartMapper.queryPassengerFlow(type);List<CockpitPassengerFlowChartVo> list1 = new ArrayList<>();//年查询递推十年List<CockpitPassengerFlowChartVo> list2 = new ArrayList<>();if ("YEAR".equals(type)){Calendar cal = Calendar.getInstance();int currentYear = cal.get(Calendar.YEAR);cal.set(Calendar.YEAR,currentYear-9);int toYear = cal.get(Calendar.YEAR);for (int i = currentYear; i >= toYear; i--) {CockpitPassengerFlowChartVo vos = new CockpitPassengerFlowChartVo();boolean flag = false;for (CockpitPassengerFlowChartVo vo : list) {if (vo.getTime().equals(String.valueOf(i))) {flag = true;//月份vos.setTime(vo.getTime());//数量vos.setNum(vo.getNum());}}//月份不存在 赋值0if (!flag) {vos.setTime(String.valueOf(i));vos.setNum(0);}list1.add(vos);}return R.ok(list1);}if ("DAY".equals(type)){for (int i = 1; i <=30 ; i++) {CockpitPassengerFlowChartVo vos = new CockpitPassengerFlowChartVo();boolean flag = false;for (CockpitPassengerFlowChartVo vo : list) {if (vo.getTime().equals(String.valueOf(i))) {flag = true;//月份vos.setTime(vo.getTime());//数量vos.setNum(vo.getNum());}}//月份不存在 赋值0if (!flag) {vos.setTime(String.valueOf(i));vos.setNum(0);}list2.add(vos);}return R.ok(list2);}return R.ok(list);}