Creating Data

In MongoDB, you can create data using the insertOne() and insertMany() methods. These methods allow you to add new documents to a collection.

Inserting a Single Document

Syntax:
db.<collection_name>.insertOne({})

Example:
use mydatabase
db.mycollection.insertOne({ name: "John Doe", age: 30 })

This method takes a single object as an argument, which represents the document to be inserted. The method returns an object with two properties: acknowledged and insertedId.

• acknowledged: A boolean indicating whether the operation was successful.
• insertedId: The _id of the inserted document, or undefined if the operation failed.

Inserting Multiple Documents

Syntax:
db.<collection_name>.insertMany([{}])

Example:
use mydatabase
db.mycollection.insertMany([
  { name: "Jane Doe", age: 25 },
  { name: "Bob Smith", age: 40 },
  { name: "Alice Johnson", age: 28 }
])

This method takes an array of objects as an argument, where each object represents a document to be inserted. The method returns an object with two properties: acknowledged and insertedIds.

• acknowledged: A boolean indicating whether the operation was successful.
• insertedIds: An array of **_id**s of the inserted documents, or an empty array if the operation failed.

Reading Data

In MongoDB, you can read data using the find() and findOne() methods. These methods allow you to retrieve documents from a collection.

Retrieving All Documents

To retrieve all documents in a collection, use the find() method:

use database
db.<collection_name>.find()