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Display the undefined and exact MongoDB document records
For this, use the forEach(). To display the values, use printjson(). Let us create a collection with documents −
> db.demo496.insertOne({"Name":"David","CountryName":"US"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e84b04ab0f3fa88e22790ce")
}
> db.demo496.insertOne({"Name":"John","CountryName":"AUS"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e84b054b0f3fa88e22790cf")
}
> db.demo496.insertOne({"Name":"Robert","CountryName":"UK"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e84b05db0f3fa88e22790d0")
}Display all documents from a collection with the help of find() method −
> db.demo496.find();
This will produce the following output −
{ "_id" : ObjectId("5e84b04ab0f3fa88e22790ce"), "Name" : "David", "CountryName" : "US" }
{ "_id" : ObjectId("5e84b054b0f3fa88e22790cf"), "Name" : "John", "CountryName" : "AUS" }
{ "_id" : ObjectId("5e84b05db0f3fa88e22790d0"), "Name" : "Robert", "CountryName" : "UK" }Following is the query to display undefined for documents −
> db.demo496.find({}).forEach( (done, notDone) => { printjson(notDone); });This will produce the following output −
undefined undefined undefined
Following is the query to display the documents with.forEach() −
> db.demo496.find({}).forEach( (done, notDone) => { printjson(done); });This will produce the following output −
{
"_id" : ObjectId("5e84b04ab0f3fa88e22790ce"),
"Name" : "David",
"CountryName" : "US"
}
{
"_id" : ObjectId("5e84b054b0f3fa88e22790cf"),
"Name" : "John",
"CountryName" : "AUS"
}
{
"_id" : ObjectId("5e84b05db0f3fa88e22790d0"),
"Name" : "Robert",
"CountryName" : "UK"
}
Updated on: 13-May-2020
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