MongoDB CRUD Operations - Yash-777/mongo-java-driver GitHub Wiki

db.collection_name.

CURD Operations over Collection Data ^{Refereed examples}

db.student.insert({
	regNo: "3014",
	name: "Test Student",
	course: {
		courseName: "MCA",
		duration: "3 Years"
	},
	address: {
		city: "Bangalore",
		state: "KA",
		country: "India"
	}
})

For Example : Let us retrieve the record from the student collection where the attribute regNo is 3014 and the query for the same is as shown below:

db.students.find({"regNo":"3014"})

Let us update the attribute name of the collection student for the document with regNo 3014.

db.student.update({
	"regNo": "3014"	
},
$set:
{
	"name":"Viraj"
})

Removing an entry from the collection (Delete) « Let us now look into the deleting an entry from a collection. In order to delete an entry from a collection, run the command as shown below :

db.student.remove({"regNo":"3014"})

Note that after running the remove() method, the entry has been deleted from the student collection.