通过rulerCode分组 统计每组中的总数量
> db.data645.aggregate([{$group: { _id: "$rulerCode", count: { $sum: 1 } }}])


{ "_id" : "04000101", "count" : 23188627 }
{ "_id" : "04000102", "count" : 46055501 }
{ "_id" : "02800005", "count" : 46010054 }
{ "_id" : "0205FF00", "count" : 46260039 }
{ "_id" : "0203FF00", "count" : 46315668 }
{ "_id" : "0201FF00", "count" : 46144939 }
{ "_id" : "03110000", "count" : 46055396 }
{ "_id" : "10000002", "count" : 46126639 }
{ "_id" : "22000000", "count" : 46128531 }
{ "_id" : "04800002", "count" : 46180150 }
{ "_id" : "0101FF00", "count" : 45938536 }
{ "_id" : "0007FF00", "count" : 45952895 }
{ "_id" : "0001FF00", "count" : 46299699 }
{ "_id" : "06000002", "count" : 46080602 }
{ "_id" : "0003FF00", "count" : 46040239 }
{ "_id" : "02800002", "count" : 46093662 }
{ "_id" : "0311000C", "count" : 46006563 }
{ "_id" : "0002FF00", "count" : 46002216 }
{ "_id" : "02800004", "count" : 46081499 }
{ "_id" : "0206FF00", "count" : 45689013 }
Type "it" for more
> 
> 
> it
{ "_id" : "0004FF00", "count" : 46118865 }
{ "_id" : "0005FF00", "count" : 45790648 }
{ "_id" : "04800004", "count" : 46035439 }
{ "_id" : "23000002", "count" : 46141090 }
{ "_id" : "04800001", "count" : 23111870 }
{ "_id" : "0061FF00", "count" : 46074137 }
{ "_id" : "0006FF00", "count" : 46116865 }
{ "_id" : "0102FF00", "count" : 45960361 }
{ "_id" : "10000001", "count" : 23143638 }
{ "_id" : "04800003", "count" : 46002081 }
{ "_id" : "0311FF01", "count" : 23037920 }
{ "_id" : "03100000", "count" : 46159809 }
{ "_id" : "0204FF00", "count" : 45866787 }
{ "_id" : "0202FF00", "count" : 45955009 }
{ "_id" : "0008FF00", "count" : 46431485 }
{ "_id" : "23000001", "count" : 23083520 }
{ "_id" : "0060FF00", "count" : 45917357 }
> it
no cursor
在指定时间范围内 根据rulerCode分组 统计每组的总数量
> db.data645.aggregate( [
...                         { $match : { storageTime : { $gte : "2019-09-10 00:00:00", $lt : "2019-09-11 23:59:59" } } },
...                         { $group: { _id: "$rulerCode", count: { $sum: 1 } } }
...                        ] )
{ "_id" : "0202FF00", "count" : 80 }
{ "_id" : "0101FF00", "count" : 80 }
{ "_id" : "0002FF00", "count" : 80 }
{ "_id" : "04800004", "count" : 80 }
{ "_id" : "03100000", "count" : 80 }
{ "_id" : "0203FF00", "count" : 80 }
{ "_id" : "22000000", "count" : 160 }
{ "_id" : "04800002", "count" : 160 }
{ "_id" : "23000002", "count" : 240 }
{ "_id" : "02800005", "count" : 80 }
{ "_id" : "02800004", "count" : 80 }
{ "_id" : "0005FF00", "count" : 80 }
{ "_id" : "0004FF00", "count" : 80 }
{ "_id" : "0001FF00", "count" : 240 }
{ "_id" : "0311000C", "count" : 240 }
{ "_id" : "02800002", "count" : 160 }
{ "_id" : "0003FF00", "count" : 160 }
{ "_id" : "0007FF00", "count" : 160 }
{ "_id" : "0205FF00", "count" : 160 }
{ "_id" : "0008FF00", "count" : 80 }
Type "it" for more
> it
{ "_id" : "0102FF00", "count" : 240 }
{ "_id" : "04000101", "count" : 80 }
{ "_id" : "0201FF00", "count" : 80 }
{ "_id" : "04800001", "count" : 80 }
{ "_id" : "0061FF00", "count" : 160 }
{ "_id" : "0060FF00", "count" : 80 }
> it
no cursor
> db.data645.findOne()
{
    "_id" : ObjectId("5d639e2446e0fb0001c7b76a"),
    "_class" : "com.alibaba.fastjson.JSONObject",
    "dataItem" : "1.662",
    "terminalTime" : "2019-07-10 16:34:04",
    "storageTime" : "2019-08-26 16:53:56",
    "rulerCode" : "02800004",
    "autoType" : "auto",
    "ammeterId" : "045925041806"
}
> 
> 
> db.data645.find().count()
1589500037
> db.data645.find({storageTime : { $gte : "2019-09-10 00:00:00", $lt : "2019-09-11 23:59:59" }}).count()
3280

代码实现

@Override
    public ArrayList<Data645> getListUsedToTest(String maxStorageTime, String now) {
        ArrayList<Data645> data645ArrayList=null;
        //封装查询条件
        List<AggregationOperation> operations = new ArrayList<>();
        try {
            //从MongoDB读取数据的开始时间
            long beginMongoTime=System.currentTimeMillis();
            //过滤条件
            operations.add(Aggregation.match(Criteria.where("rulerCode").ne("String_89!qaz@wsx").andOperator(
                    Criteria.where("storageTime").gte(maxStorageTime),
                    Criteria.where("storageTime").lt(now)
            )));
            //分组统计
            operations.add(Aggregation.group("rulerCode").sum("_id").as("totalCount"));
            Aggregation aggregation = Aggregation.newAggregation(operations);
            AggregationResults<Data645> results= mongoTemplate.aggregate(aggregation, "data645", Data645.class);
            //从MongoDB读取数据的结束时间
            long endMongoTime=System.currentTimeMillis();
            EtlProjectApplication.loggerMongoDBToMysql.info("step5 ===> MongoDB聚合查询耗时花费 ："+(endMongoTime - beginMongoTime)+" 毫秒"+"  当前时间为 ："+ DateUtil.getStringDate());
            System.err.println("step5 ===> MongoDB聚合查询耗时花费 ："+(endMongoTime - beginMongoTime)+" 毫秒"+"  当前时间为 ："+ DateUtil.getStringDate());

            // 统计总数量返回 此数量统计用于渲染曲线的x
            Query query = new Query(
                    Criteria.where("rulerCode").ne("String_89!qaz@wsx")
                            .andOperator(
                                    Criteria.where("storageTime").gte(maxStorageTime),
                                    Criteria.where("storageTime").lt(now)
                            )
            ).with(new Sort(new Sort.Order(Sort.Direction.ASC,"storageTime")));
            data645ArrayList=(ArrayList<Data645>) mongoTemplate.find(query,Data645.class);
        }catch (Exception e){
            e.printStackTrace();
        }
        return data645ArrayList;
    }