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Work with $push in MongoDB
Let us create a collection with documents −
> db.demo738.insertOne({Subjects:["C","C++"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ead696557bb72a10bcf0661")
}
> db.demo738.insertOne({Subjects:["MySQL","PL/SQL"]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5ead696657bb72a10bcf0662")
}Display all documents from a collection with the help of find() method −
> db.demo738.find();
This will produce the following output −
{ "_id" : ObjectId("5ead696557bb72a10bcf0661"), "Subjects" : [ "C", "C++" ] }
{ "_id" : ObjectId("5ead696657bb72a10bcf0662"), "Subjects" : [ "MySQL", "PL/SQL" ] }Following is the query to push −
>db.demo738.update({_id:ObjectId("5ead696657bb72a10bcf0662")},{$push:{"Subjects":"MongoDB"}});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo738.find();
This will produce the following output −
{ "_id" : ObjectId("5ead696557bb72a10bcf0661"), "Subjects" : [ "C", "C++" ] }
{ "_id" : ObjectId("5ead696657bb72a10bcf0662"), "Subjects" : [ "MySQL", "PL/SQL", "MongoDB" ] }
Updated on: 30-Jun-2020
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