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如何在java中实现这个聚合查询我不知道该怎么做?mongodb聚合函数在java驱动中的实现
db.History.aggregate([
{ "$match" : {"thId":"001"}},
{ "$group" : {
"_id" : {"Id":"$Id","controller" : "$controller","mod" : "$mod","variable" : "$variable"}
,"variable" : {"$first": "$$ROOT"}
,"data" : {"$push":{"value":"$value","updatedDateTime":"$updatedTime"}}
}
}
])
你能证明你已经尝试过什么, – radhakrishnan