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Legal StudiesMongoDB 查询获取特定月份 | 年份（不含日期）？
你可以结合聚合框架和 $month 投影运算符。我们先使用文档创建一个集合 -
> db.specificMonthDemo.insertOne({"StudentName":"Larry","StudentDateOfBirth":new ISODate('1995-01-12')});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cb9a9ca8f1d1b97daf71819")
}
> db.specificMonthDemo.insertOne({"StudentName":"Chris","StudentDateOfBirth":new ISODate('1999-12-31')});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cb9a9db8f1d1b97daf7181a")
}
> db.specificMonthDemo.insertOne({"StudentName":"David","StudentDateOfBirth":new ISODate('2000-06-01')});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cb9a9ee8f1d1b97daf7181b")
}以下是通过 find() 方法显示集合中所有文档的查询 -
> db.specificMonthDemo.find().pretty();
将产生以下输出 -
{
"_id" : ObjectId("5cb9a9ca8f1d1b97daf71819"),
"StudentName" : "Larry",
"StudentDateOfBirth" : ISODate("1995-01-12T00:00:00Z")
}
{
"_id" : ObjectId("5cb9a9db8f1d1b97daf7181a"),
"StudentName" : "Chris",
"StudentDateOfBirth" : ISODate("1999-12-31T00:00:00Z")
}
{
"_id" : ObjectId("5cb9a9ee8f1d1b97daf7181b"),
"StudentName" : "David",
"StudentDateOfBirth" : ISODate("2000-06-01T00:00:00Z")
}以下是获取特定月份 | 年份，但不是日期的查询 -
> db.specificMonthDemo.aggregate([ {$project: {StudentName: 1, StudentDateOfBirth:
{$month: '$StudentDateOfBirth'}}}, {$match: {StudentDateOfBirth: 01}} ]).pretty();将产生以下输出 -
{
"_id" : ObjectId("5cb9a9ca8f1d1b97daf71819"),
"StudentName" : "Larry",
"StudentDateOfBirth" : 1
}
更新时间：30-Jul-2019
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