MongoDB获取“现在”和给定日期之间的时差
要获得MongpDB中日期之间的时差，请使用aggregate()。让我们创建一个包含文档的集合-
> db.demo734.insertOne({GivenDate:new ISODate("2020-01-10")});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ead4f1a57bb72a10bcf064e")
}
> db.demo734.insertOne({GivenDate:new ISODate("2020-02-20")});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ead4f2157bb72a10bcf064f")
}
> db.demo734.insertOne({GivenDate:new ISODate("2010-12-01")});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ead4f2b57bb72a10bcf0650")
}
> db.demo734.insertOne({GivenDate:new ISODate("2020-05-01")});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ead506f57bb72a10bcf0651")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo734.find();
这将产生以下输出-
{ "_id" : ObjectId("5ead4f1a57bb72a10bcf064e"), "GivenDate" : ISODate("2020-01-10T00:00:00Z") }
{ "_id" : ObjectId("5ead4f2157bb72a10bcf064f"), "GivenDate" : ISODate("2020-02-20T00:00:00Z") }
{ "_id" : ObjectId("5ead4f2b57bb72a10bcf0650"), "GivenDate" : ISODate("2010-12-01T00:00:00Z") }
{ "_id" : ObjectId("5ead506f57bb72a10bcf0651"), "GivenDate" : ISODate("2020-05-01T00:00:00Z") }以下是查询以获取“现在”和给定日期之间的时差-
> db.demo734.aggregate([
... {$project: {
...
... "differenceMilli": {
...
... $subtract:[
... new ISODate(),
... "$GivenDate"
... ]
... }
... }
... },
... {$project: {
...
... "differenceMilli": 1,
... "differenceindays": {
... $divide: [
... "$differenceMilli",
... 1000 * 60 * 60 * 24
... ]
... }
... }
... }]
... )这将产生以下输出-
{ "_id" : ObjectId("5ead4f1a57bb72a10bcf064e"), "differenceMilli" : NumberLong("9802234864"), "differenceindays" : 113.45179240740741 }
{ "_id" : ObjectId("5ead4f2157bb72a10bcf064f"), "differenceMilli" : NumberLong("6259834864"), "differenceindays" : 72.45179240740741 }
{ "_id" : ObjectId("5ead4f2b57bb72a10bcf0650"), "differenceMilli" : NumberLong("297255034864"), "differenceindays" : 3440.4517924074075 }
{ "_id" : ObjectId("5ead506f57bb72a10bcf0651"), "differenceMilli" : NumberLong(125434864), "differenceindays" : 1.4517924074074073 }