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Use ObjectId under findOne() to fetch a specific record in MongoDB?
Let us first create a collection with documents −
> db.findOneWorkingDemo.insertOne({"ClientId":1,"ClientName":"Larry","ClientAge":26});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd7c1716d78f205348bc64d")
}
> db.findOneWorkingDemo.insertOne({"ClientId":2,"ClientName":"Chris","ClientAge":28});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd7c17d6d78f205348bc64e")
}
> db.findOneWorkingDemo.insertOne({"ClientId":3,"ClientName":"Robert","ClientAge":34});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd7c1896d78f205348bc64f")
}Following is the query to display all documents from a collection with the help of find() method −
> db.findOneWorkingDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cd7c1716d78f205348bc64d"),
"ClientId" : 1,
"ClientName" : "Larry",
"ClientAge" : 26
}
{
"_id" : ObjectId("5cd7c17d6d78f205348bc64e"),
"ClientId" : 2,
"ClientName" : "Chris",
"ClientAge" : 28
}
{
"_id" : ObjectId("5cd7c1896d78f205348bc64f"),
"ClientId" : 3,
"ClientName" : "Robert",
"ClientAge" : 34
}Following is the query to implement findOne() with ObjectId −
> db.findOneWorkingDemo.findOne({"_id":ObjectId("5cd7c17d6d78f205348bc64e")});This will produce the following output −
{
"_id" : ObjectId("5cd7c17d6d78f205348bc64e"),
"ClientId" : 2,
"ClientName" : "Chris",
"ClientAge" : 28
}
Updated on: 30-Jul-2019
340 Views
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