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How to store query output in temp MongoDB database?
For this, in a single query, simply work with forEach() and store output in a temp db. Let us first create a collection with documents −
> db.demo43.insertOne({"StudentName":"Chris"}); { "acknowledged" : true, "insertedId" : ObjectId("5e25d4b3cfb11e5c34d898e5") } > db.demo43.insertOne({"StudentName":"Bob"}); { "acknowledged" : true, "insertedId" : ObjectId("5e25d4b8cfb11e5c34d898e6") } > db.demo43.insertOne({"StudentName":"David"}); { "acknowledged" : true, "insertedId" : ObjectId("5e25d4bbcfb11e5c34d898e7") }
Display all documents from a collection with the help of find() method −
> db.demo43.find();
This will produce the following output −
{ "_id" : ObjectId("5e25d4b3cfb11e5c34d898e5"), "StudentName" : "Chris" } { "_id" : ObjectId("5e25d4b8cfb11e5c34d898e6"), "StudentName" : "Bob" } { "_id" : ObjectId("5e25d4bbcfb11e5c34d898e7"), "StudentName" : "David" }
Following is the query to store query output in temp db −
> db.demo43.find().forEach(function(myDocument) { db.demo44.insert(myDocument); } )
Display all documents from a collection with the help of find() method −
> db.demo44.find();
This will produce the following output −
{ "_id" : ObjectId("5e25d4b3cfb11e5c34d898e5"), "StudentName" : "Chris" } { "_id" : ObjectId("5e25d4b8cfb11e5c34d898e6"), "StudentName" : "Bob" } { "_id" : ObjectId("5e25d4bbcfb11e5c34d898e7"), "StudentName" : "David" }
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