MongoDB – Insert Document

The insert() method in MongoDB inserts a document or documents into a collection. It takes two parameters, the first of which is the document or array of documents to insert, and the rest are optional.

  • Using this method you can also create a collection by inserting documents.
  • You can insert documents with or without _id field. If you insert a document in the collection without _id field, then MongoDB will automatically add an _id field and assign it with a unique ObjectId. And if you insert a document with _id field, then the value of the _id field must be unique to avoid the duplicate key error.
  • This method can also be used inside multi-document transactions.

Syntax:

db.Collection_name.insert(

,

{

    writeConcern: ,

    ordered:

})

Parameters:

  • The first parameter is the document or an array of documents. Documents are a structure created of file and value pairs, similar to JSON objects.
  • The second parameter is optional.

Optional Parameters:

  • writeConcern: It is only used when you do not want to use the default write concern. The type of this parameter is a document.
  • ordered: The default value of this parameter is true. If it is true, it inserts documents in the ordered manner. Otherwise, it randomly inserts documents.

Return:

  • This method returns WriteResult when you insert single document in the collection.
  • This method returns BulkWriteResult when you insert multiple documents in the collection.

Examples:

In the following examples, we are working with:

Database: gfg

Collection: student

Document: No document but, we want to insert in the form of the student name and student marks.

Insert the document whose name is Akshay and marks is 500

Here, we insert a document in the student collection whose name is Akshay and marks is 500 using insert() method.

db.student.insert({Name: "Akshay", Marks: 500})

Output:

Insert multiple documents in the collection

Here, we insert multiple documents in the collection by passing an array of documents in the insert method.

db.student.insert([{Name: "Bablu", Marks: 550}, 
           {Name: "Chintu", Marks: 430},
                   {Name: "Devanshu", Marks: 499}])

Output:

Insert a document with _id field

Here, we insert a document in the student collection with _id field.

db.student.insert({_id: 102,Name: "Anup", Marks: 400})

Output:

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