[英]Create Spring Data Aggregation from MongoDb aggregation query
[英]Create aggregation in mongodb with spring
我有在mongo中工作的聚合,我需要用spring在java中创建确切的聚合。 我没找到办法。 你知道有没有?
db.collection_name.aggregate([
{
$group: {
_id : {
year : {$year : "$receivedDate" },
month : {$month: "$receivedDate"},
day : { $dayOfMonth : "$receivedDate"}
},
count : { $sum: 1 }
}
}
])
您可以先在投影操作中使用SpEL andExpression
Expression来投影字段,然后在分组操作中按新字段分组:
Aggregation agg = newAggregation(
project()
.andExpression("year(receivedDate)").as("year")
.andExpression("month(receivedDate)").as("month")
.andExpression("dayOfMonth(receivedDate)").as("day"),
group(fields().and("year").and("month").and("day"))
.count().as("count")
);
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