ECharts实现按月统计和MTBF统计

一、数据准备

下表是小明最近一年的旅游记录

现在小明有两个需求

1. 统计自己2024年每个月出去旅游了多少次及消费
2. 统计自己这一年每个城市旅行的平均间隔时间

二、按月统计

SELECT substring(a.create_date, 6, 2)::int  as month, 
sum(a.cost_money) cost_money , 
sum(a.travel_count) travel_count from    
    (
        SELECT to_char(create_date, 'YYYY-MM') AS create_date,         
		sum(CASE WHEN to_char(create_date, 'YYYY') = '2024' THEN cost_money ELSE 0 END) AS cost_money,
        count(CASE WHEN to_char(create_date, 'YYYY') = '2024' THEN city_name ELSE null END) AS travel_count
        FROM travel    
        WHERE create_date >= '2024-01-01'     AND create_date <  '2024-12-31'   
        GROUP BY to_char(create_date, 'YYYY-MM')     
        ORDER BY create_date
        ) a 
GROUP BY substring(a.create_date, 6, 2) ::int
ORDER BY month asc复制

查询结果如下

现在把这些数据加载到echarts折现柱状图中直观地展示出来

option = {
  title : {
    text : '2024旅游统计图',
    textStyle :{
          color:'rgba(15,64,245,1)'
        }
  },
  tooltip: {
    trigger: 'axis',
    axisPointer: {
      type: 'cross',
      crossStyle: {
        color: '#999'
      }
    }
  },
  xAxis: [
    {
      type: 'category',
      data: ['1月', '2月', '3月', '4月', '5月', '6月', '7月'],
      axisPointer: {
        type: 'shadow'
      }
    }
  ],
  yAxis: [
    {
      type: 'value',
      name: '金额',
      min: 0,
      axisLabel: {
        formatter: '{value} 元'
      }
    },
    {
      type: 'value',
      name: '次数',
      min: 0,
      axisLabel: {
        formatter: '{value} 次'
      }
    }
  ],
  series: [
    {
      name: '消费金额',
      type: 'bar',
      tooltip: {
        valueFormatter: function (value) {
          return value + ' 元';
        }
      },
      data: [
       346, 1277,505,656,5795,662,532
      ]
    },
    {
      name: '旅游次数',
      type: 'line',
      yAxisIndex: 1,
      tooltip: {
        valueFormatter: function (value) {
          return value + ' 次';
        }
      },
      data: [2, 3, 1, 1, 4, 1,1]
    }
  ]
};复制

展示结果如下图：可以看出5月份的旅游次数最多，消费金额也是5月最多

三、按城市统计平均旅游间隔时间

1，先用sql查询出每个城市的名字和旅游日期，同时按城市排序

SELECT city_name,create_date FROM travel 
order by city_name asc,create_date asc复制

2，使用java分组方法将数据按城市分组成一个map

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.stream.Collectors;;
import java.util.List;
import java.util.Map;
import java.util.ArrayList;
public class Main {
	public static void main(String[] args) {
		
		List<TravelData> list = new ArrayList<>();
		list.add(new TravelData("北京","2023-10-10 10:10:10"));
		list.add(new TravelData("北京","2024-01-24 12:12:12"));
		list.add(new TravelData("北京","2024-02-24 12:12:12"));
		list.add(new TravelData("北京","2024-05-24 12:12:12"));
		list.add(new TravelData("北京","2024-07-24 12:12:12"));
		list.add(new TravelData("广州","2024-02-24 12:12:12"));
		list.add(new TravelData("广州","2024-03-24 12:12:12"));
		list.add(new TravelData("广州","2024-05-18 12:12:12"));
		list.add(new TravelData("广州","2024-06-24 12:12:12"));
		list.add(new TravelData("上海","2023-11-11 12:12:12"));
		list.add(new TravelData("上海","2023-12-12 12:12:12"));
		list.add(new TravelData("上海","2024-01-24 12:12:12"));
		list.add(new TravelData("上海","2024-02-24 12:12:12"));
		list.add(new TravelData("上海","2024-04-24 12:12:12"));
		list.add(new TravelData("上海","2024-05-14 12:12:12"));
		list.add(new TravelData("上海","2024-05-24 12:12:12"));
		// 以上数据可使用数据库sql查询
		Map<String, List<TravelData>> maps = list.stream().collect(Collectors.groupingBy(TravelData::getCityName));
		maps.forEach((key, dateList) -> {
    		    long timeTotal = 0;
    		    for (int i = 0; i < dateList.size(); i++) {
    		         if(i < dateList.size() - 1){
                        TravelData nextItem = dateList.get(i + 1);
                        timeTotal += nextItem.getCreateDate() - dateList.get(i).getCreateDate();
                    }
    		    }
    		    long avgTime = timeTotal/(dateList.size() - 1);
    		    // 单位为天
    		    System.out.println(key + "，平均间隔 = " + avgTime/(1000*60*60*24));
		    }
		);
	}
	
	static class TravelData{
	    
	    String cityName;
	    Date createDate;
	    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
	    
	    public TravelData(String name,String date){
	        this.cityName = name;
	        try{
	        this.createDate = dateFormat.parse(date);
	        }catch(Exception e){
	            	System.out.println(e.getMessage());
	        }
	    }
	    
	    public String getCityName(){
	        return cityName;
	    }
	    
	     public Long getCreateDate(){
	        return createDate.getTime();
	    }
	    
	    public String toString(){
	        return "city:"+cityName + ",create_date:"+dateFormat.format(createDate);
	    }
	}
}
 复制

以上java代码输出结果为

把数据装载到ECharts图表中

option = {
  title : {
    text : '2024旅游城市MTBF',
    textStyle :{
          color:'rgba(15,64,245,1)'
        }
  },
  tooltip: {
    trigger: 'axis',
    axisPointer: {
      type: 'cross',
      crossStyle: {
        color: '#999'
      }
    }
  },
  xAxis: [
    {
      type: 'category',
      data: ['北京', '上海', '广州'],
      axisPointer: {
        type: 'shadow'
      }
    }
  ],
  yAxis: [
    {
      type: 'value',
      name: '间隔',
      min: 0,
      axisLabel: {
        formatter: '{value} '
      }
    }
  ],
  series: [
    {
      name: '平均旅游间隔',
      type: 'bar',
      tooltip: {
        valueFormatter: function (value) {
          return value + ' 天';
        }
      },
      data: [
       72, 32, 40
      ]
    }
  ]
};复制

实际效果如下图：由图可见，小明去上海的频率最高