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How to store query result (a single document) into a variable?
To store query result (a single document) into a variable, you can use var. Following is the syntax
var anyVariableName=db.yourCollectionName.find().limit(1); yourVariableName; //Print the records;
Let us first create a collection with documents
> db.storeQueryResultDemo.insertOne({"ClientName":"Chris","ClientAge":23});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9ecf8fd628fa4220163b8d")
}
> db.storeQueryResultDemo.insertOne({"ClientName":"Robert","ClientAge":21});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9ecf97d628fa4220163b8e")
}
> db.storeQueryResultDemo.insertOne({"ClientName":"Sam","ClientAge":25});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9ecf9ed628fa4220163b8f")
}
> db.storeQueryResultDemo.insertOne({"ClientName":"Mike","ClientAge":26});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9ecfa8d628fa4220163b90")
}Following is the query to display all documents from a collection with the help of find() method
> db.storeQueryResultDemo.find().pretty();
This will produce the following output
{
"_id" : ObjectId("5c9ecf8fd628fa4220163b8d"),
"ClientName" : "Chris",
"ClientAge" : 23
}
{
"_id" : ObjectId("5c9ecf97d628fa4220163b8e"),
"ClientName" : "Robert",
"ClientAge" : 21
}
{
"_id" : ObjectId("5c9ecf9ed628fa4220163b8f"),
"ClientName" : "Sam",
"ClientAge" : 25
}
{
"_id" : ObjectId("5c9ecfa8d628fa4220163b90"),
"ClientName" : "Mike",
"ClientAge" : 26
}Following is the query to store query result (a single document) into a variable
> var queryResult=db.storeQueryResultDemo.find().limit(1);
Following is the query to display records of the above variable
> queryResult;
This will produce the following output
{ "_id" : ObjectId("5c9ecf8fd628fa4220163b8d"), "ClientName" : "Chris", "ClientAge" : 23 }
Updated on: 30-Jul-2019
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