苍穹外卖--营业额统计功能实现

sky-server/src/main/java/com/sky/service/ReportService.java

@@ -0,0 +1,15 @@
+package com.sky.service;
+
+import com.sky.vo.TurnoverReportVO;
+
+import java.time.LocalDate;
+
+public interface ReportService {
+    /**
+     * 统计指定时间内每天的营业额数据
+     * @param begin
+     * @param end
+     * @return
+     */
+    TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end);
+}

sky-server/src/main/java/com/sky/service/impl/ReportServiceImpl.java

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+package com.sky.service.impl;
+
+import com.sky.entity.Orders;
+import com.sky.mapper.OrderMapper;
+import com.sky.service.ReportService;
+import com.sky.vo.TurnoverReportVO;
+import org.apache.commons.lang3.StringUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.LocalTime;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@Service
+public class ReportServiceImpl implements ReportService {
+
+    @Autowired
+    private OrderMapper orderMapper;
+
+
+    /**
+     * 统计指定时间内每天的营业额数据
+     * @param begin
+     * @param end
+     * @return
+     */
+    @Override
+    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {//1.1 1.2 1.3----- 1.7
+        //根据对应的日期，将当天的所有已完成的订单查询出来，并统计总金额（sum）
+        List<LocalDate> dateList = new ArrayList<>();
+        dateList.add(begin);
+        //不停地创建日期对象，直到end
+        while (!begin.equals(end)){
+            begin =  begin.plusDays(1);
+            dateList.add(begin);
+        }
+
+        //创建一个集合用来保存对应日期的当天的营业金额
+        List<Double> turnoverList = new ArrayList<>();
+
+        //遍历日期，将每天的营业额查询并添加到集合中
+        for (LocalDate localDate : dateList) {
+            //查询localDate日期对应的营业额，营业额指的是，已完成状态的订单的总和
+            //一天的订单如何获取？？？通过localDate对象，获取一天的最小时间和最大时间，订单的下单时间在此期间那就就是当天的 订单！！！
+            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);
+            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);
+
+            //sql:select sum(amount) from orders where order_time > beginTime and order_time < endTime and status = 5;
+            //准备下查询条件数据
+
+            Map map = new HashMap();
+            map.put("begin", beginTime);
+            map.put("end", endTime);
+            map.put("status", Orders.COMPLETED);
+            Double turnover = orderMapper.sumByMap(map);
+            //注意，如果当日没有订单，那么金额为0
+            turnoverList.add(turnover == null?0.0:turnover);
+        }
+        TurnoverReportVO turnoverReportVO = TurnoverReportVO.builder()
+                .dateList(StringUtils.join(dateList, ","))
+                .turnoverList(StringUtils.join(turnoverList, ","))
+                .build();
+
+
+        return turnoverReportVO;
+    }
+}