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MongoDB find() to operate on recursive search?
Use find() with dot notation to perform recursive search. Let us first create a collection with documents −
> db.findOperationDemo.insertOne({"ClientDetails":[{"ClientId":101,"ClientName":"Chris"},{"ClientId":102,"ClientName":"Robert"}]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd9a118b50a6c6dd317ad99")
}
> db.findOperationDemo.insertOne({"ClientDetails":[{"ClientId":110,"ClientName":"David"},{"ClientId":112,"ClientName":"Mike"}]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd9a12fb50a6c6dd317ad9a")
}Following is the query to display all documents from a collection with the help of find() method −
> db.findOperationDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cd9a118b50a6c6dd317ad99"),
"ClientDetails" : [
{
"ClientId" : 101,
"ClientName" : "Chris"
},
{
"ClientId" : 102,
"ClientName" : "Robert"
}
]
}
{
"_id" : ObjectId("5cd9a12fb50a6c6dd317ad9a"),
"ClientDetails" : [
{
"ClientId" : 110,
"ClientName" : "David"
},
{
"ClientId" : 112,
"ClientName" : "Mike"
}
]
}Following is the query to implement find() for recursive search using dot notation −
> db.findOperationDemo.find({"ClientDetails.ClientId":110});This will produce the following output −
{ "_id" : ObjectId("5cd9a12fb50a6c6dd317ad9a"), "ClientDetails" : [ { "ClientId" : 110, "ClientName" : "David" }, { "ClientId" : 112, "ClientName" : "Mike" } ] }
Updated on: 30-Jul-2019
508 Views
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