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Extract a MongoDB document with a specific string
To extract a MongoDB document with a specific string, use $match in MongoDB. Let us create a collection with documents −
> db.demo424.insert(
... {
...
... "Information" : [
... {
... id:10,
... Name:"Chris"
... },
... {
... id:11,
... Name:"David"
... }
... ]
... }
... )
WriteResult({ "nInserted" : 1 })
>
> db.demo424.insert(
... {
...
... "Information" : [
... {
... id:101,
... Name:"Mike"
... },
... {
... id:102,
... Name:"John"
... }
... ]
... }
... )
WriteResult({ "nInserted" : 1 })Display all documents from a collection with the help of find() method −
> db.demo424.find();
This will produce the following output −
{ "_id" : ObjectId("5e74eb9dbbc41e36cc3cae6a"), "Information" : [ { "id" : 10, "Name" : "Chris" }, { "id" : 11, "Name" : "David" } ] }
{ "_id" : ObjectId("5e74eb9ebbc41e36cc3cae6b"), "Information" : [ { "id" : 101, "Name" : "Mike" }, { "id" : 102, "Name" : "John" } ] }Following is the query to extract a MongoDB document with a specific string −
> db.demo424.aggregate(
... [ { $match : { "Information.Name": "Chris" } } ]
... );This will produce the following output −
{ "_id" : ObjectId("5e74eb9dbbc41e36cc3cae6a"), "Information" : [ { "id" : 10, "Name" : "Chris" }, { "id" : 11, "Name" : "David" } ] }
Updated on: 03-Apr-2020
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