获取上个月的MongoDB结果
首先，获取当前月份并减去1以获取上个月的记录。首先让我们创建一个包含文档的集合-
> db.findOneMonthAgoData.insertOne({"CustomerName":"Chris","PurchaseDate":new ISODate("2019-12-26")});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e04e16c150ee0e76c06a04f")
}
> db.findOneMonthAgoData.insertOne({"CustomerName":"David","PurchaseDate":new ISODate("2019-11-26")});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e04e178150ee0e76c06a050")
}
> db.findOneMonthAgoData.insertOne({"CustomerName":"Bob","PurchaseDate":new ISODate("2020-11-26")});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e04e186150ee0e76c06a051")
}以下是在find()方法的帮助下显示集合中所有文档的查询-
> db.findOneMonthAgoData.find();
这将产生以下输出-
{ "_id" : ObjectId("5e04e16c150ee0e76c06a04f"), "CustomerName" : "Chris", "PurchaseDate" : ISODate("2019-12-26T00:00:00Z") }
{ "_id" : ObjectId("5e04e178150ee0e76c06a050"), "CustomerName" : "David", "PurchaseDate" : ISODate("2019-11-26T00:00:00Z") }
{ "_id" : ObjectId("5e04e186150ee0e76c06a051"), "CustomerName" : "Bob", "PurchaseDate" : ISODate("2020-11-26T00:00:00Z") }这是从上个月获取结果的查询-
> monthData=new Date();
ISODate("2019-12-26T16:43:04.283Z")
> monthData.setMonth(monthData.getMonth() - 1);
1574786584283
> db.findOneMonthAgoData.find({PurchaseDate:{$gte:monthData}});这将产生以下输出-
{ "_id" : ObjectId("5e04e16c150ee0e76c06a04f"), "CustomerName" : "Chris", "PurchaseDate" : ISODate("2019-12-26T00:00:00Z") }
{ "_id" : ObjectId("5e04e186150ee0e76c06a051"), "CustomerName" : "Bob", "PurchaseDate" : ISODate("2020-11-26T00:00:00Z") }