group by date 聚合查询日期 统计每天数据(信息量)
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{
"_id" : ObjectId("557ac1e2153c43c320393d9d"),
"msgType" : "text",
"sendTime" : ISODate("2015-06-12T11:26:26.000Z")
}
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2
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{
"_id" : ObjectId("557ac1ee153c43c320393d9e"),
"msgType" : "text",
"sendTime" : ISODate("2015-06-12T11:26:38.000Z")
}
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3
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{
"_id" : ObjectId("557ac2012de5d32d213963b5"),
"msgType" : "text",
"sendTime" : ISODate("2015-06-12T11:26:56.000Z")
}
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4
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{
"_id" : ObjectId("557ac978bb31196e21d23868"),
"msgType" : "text",
"sendTime" : ISODate("2015-06-12T11:58:47.000Z")
}
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5
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{
"_id" : ObjectId("557ac9afbb31196e21d23869"),
"msgType" : "text",
"sendTime" : ISODate("2015-06-12T11:59:43.000Z")
}
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SQL Here
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db.getCollection( 'wechat_message' ).aggregate(
[
{ $project : { day : {$substr: [ "$sendTime" , 0, 10] }}},
{ $ group : { _id : "$day" , number : { $ sum : 1 }}},
{ $sort : { _id : -1 }}
]
)
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Result Here
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"result" : [
{
"_id" : "2015-07-06" ,
"number" : 13.0000000000000000
},
{
"_id" : "2015-07-05" ,
"number" : 3.0000000000000000
},
{
"_id" : "2015-07-03" ,
"number" : 10.0000000000000000
},
{
"_id" : "2015-07-02" ,
"number" : 29.0000000000000000
},
]
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查询某一天所有信息的3种方法,根据日期查询
mongodb的查询真让人难以琢磨,就查询单天信息,都需要花费一番功夫才行。
第一种方式:
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coll.aggregate([
{$project:{sendDate: {$substr: [ '$sendTime' , 0, 10]}, sendTime: 1, content:1}},
{$match:{sendDate: '2015-07-05' }},
])
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第二种方式(第一种的变异):
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coll.aggregate([
{$match: { 'sendTime' : { '$gte' : new Date( '2015-07-05' ), '$lt' : new Date( '2015-07-06' )}}}
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第三中方式(第二种的变异):
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coll.aggregate([
{$match: { 'sendTime' : { '$gte' : new Date( '2015-07-05 00:00:00' ), '$lte' : new Date( '2015-07-05 23:59:59' )}}}
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查询结果如下(展示一种方式:其他展示略有不同):
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[ { _id: 5599b09bc16aac90e9fb7995, sendDate: '2015-07-05' },
{ _id: 5599b161c16aac90e9fb7996, sendDate: '2015-07-05' },
{ _id: 5599b161c16aac90e9fb7997, sendDate: '2015-07-05' } ]
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