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How to retrieve a value from MongoDB by its key name?
To retrieve a value from MongoDB by its key name, use the following syntax −
db.yourCollectionName.find({},{"yourFieldName":1}).pretty();To understand the above syntax, let us create a collection with the document. The query to create a collection with a document is as follows −
> db.retrieveValueFromAKeyDemo.insertOne({"CustomerName":"Larry","CustomerAge":21,"CustomerCountryName":"US"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9163b5a56efcc0f9e69048")
}
> db.retrieveValueFromAKeyDemo.insertOne({"CustomerName":"Chris","CustomerAge":24,"CustomerCountryName":"AUS"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9163c4a56efcc0f9e69049")
}
> db.retrieveValueFromAKeyDemo.insertOne({"CustomerName":"Mike","CustomerAge":26,"CustomerCountryName":"UK"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9163d3a56efcc0f9e6904a")
}Display all documents from a collection with the help of find() method. The query is as follows −
> db.retrieveValueFromAKeyDemo.find().pretty();
The following is the output −
{
"_id" : ObjectId("5c9163b5a56efcc0f9e69048"),
"CustomerName" : "Larry",
"CustomerAge" : 21,
"CustomerCountryName" : "US"
}
{
"_id" : ObjectId("5c9163c4a56efcc0f9e69049"),
"CustomerName" : "Chris",
"CustomerAge" : 24,
"CustomerCountryName" : "AUS"
}
{
"_id" : ObjectId("5c9163d3a56efcc0f9e6904a"),
"CustomerName" : "Mike",
"CustomerAge" : 26,
"CustomerCountryName" : "UK"
}Here is the query to retrieve a value from MongoDB by its key name i.e. we have considered the key ‘CustomerCountryName’ −
> db.retrieveValueFromAKeyDemo.find({},{"CustomerCountryName":1}).pretty();The following is the output:
{
"_id" : ObjectId("5c9163b5a56efcc0f9e69048"),
"CustomerCountryName" : "US"
}
{
"_id" : ObjectId("5c9163c4a56efcc0f9e69049"),
"CustomerCountryName" : "AUS"
}
{
"_id" : ObjectId("5c9163d3a56efcc0f9e6904a"),
"CustomerCountryName" : "UK"
}
Updated on: 30-Jul-2019
1K+ Views
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