MongoDB CRUD Operations

CRUD operations Create, Read, Update, and Delete—are essential for interacting with databases. In MongoDB, CRUD operations allow users to perform various actions like inserting new documents, reading data, updating records, and deleting documents from collections. Mastering these operations is fundamental to working with MongoDB and building efficient applications.

In this article, we will explain each of the four core CRUD operations in MongoDB, their use cases, and provide examples to help you perform these operations effectively.

What are CRUD Operations in MongoDB?

Now that we know the components of the CRUD operation, let's learn about each individual operation in MongoDB. We will know what each operation does, and the methods to perform these operations in MongoDB. We will create, read, update and delete documents from MongoDB server.

• Create: Add new documents to a collection.
• Read: Retrieve documents from a collection.
• Update: Modify existing documents.
• Delete: Remove documents from a collection.

These operations form the core functionality of interacting with MongoDB databases and are essential for managing data.

1. Create Operations

The create or insert operations are used to insert or add new documents in the collection. If a collection does not exist, then it will create a new collection in the database. We can perform, create operations using the following methods provided by the MongoDB:

Create Operations Example

Let's look at some examples of the Create operation from CRUD in MongoDB.

Example 1:

In this example, we are inserting details of a single student in the form of document in the student collection using db.collection.insertOne() method. Example 2:

In this example, we are inserting details of the multiple students in the form of documents in the student collection using db.collection.insertMany() method.

2. Read Operations

The Read operations are used to retrieve documents from the collection, or in other words, read operations are used to query a collection for a document. We can perform read operation using the following method provided by the MongoDB:

Note: pretty() method is used to decorate the result such that it is easy to read.

Read Operations Example

In this example, we are retrieving the details of students from the student collection using db.collection.find() method.

3. Update Operations

The update operations are used to update or modify the existing document in the collection. We can update a single document or multiple documents that match a given query. We can perform update operations using the following methods provided by the MongoDB:

Update Operations Example

Let's look at some examples of the update operation from CRUD in MongoDB.

Example 1:

In this example, we are updating the age of Sumit in the student collection using db.collection.updateOne() method. Example 2:

In this example, we are updating the year of course in all the documents in the student collection using db.collection.updateMany() method.

4. Delete Operations

The delete operation are used to delete or remove the documents from a collection. We can delete documents based on specific criteria or remove all documents. We can perform delete operations using the following methods provided by the MongoDB:

Delete Operations Examples

Let's look at some examples of delete operation from CRUD in MongoDB.

Example 1:

In this example, we are deleting a document from the student collection using db.collection.deleteOne() method. Example 2:

In this example, we are deleting all the documents from the student collection using db.collection.deleteMany() method.

Conclusion

MongoDB's CRUD operations are essential for effectively interacting with our database. The ability to create, read, update, and delete documents allows us to manage our data efficiently and perform all the required database management tasks. In this guide, we've explained each CRUD operation in MongoDB, provided examples for each, and discussed how to use MongoDB's powerful features to manipulate and manage your data.

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Article Tags :

• Computer Subject
• MongoDB
• Databases
• MongoDB