MongoDB CRUD Operations¶

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CRUD operations create, read, update, and delete documents.

Create Operations¶

Create or insert operations add new documents to a collection. If the collection does not currently exist, insert operations will create the collection.

MongoDB provides the following methods to insert documents into a collection:

db.collection.insertOne() New in version 3.2
db.collection.insertMany() New in version 3.2

In MongoDB, insert operations target a single collection. All write operations in MongoDB are atomic on the level of a single document.

The components of a MongoDB insertOne operations.

For examples, see Insert Documents.

Read Operations¶

Read operations retrieves documents from a collection; i.e. queries a collection for documents. MongoDB provides the following methods to read documents from a collection:

db.collection.find()

You can specify query filters or criteria that identify the documents to return.

The components of a MongoDB find operation.

For examples, see:

Update Operations¶

Update operations modify existing documents in a collection. MongoDB provides the following methods to update documents of a collection:

db.collection.updateOne() New in version 3.2
db.collection.updateMany() New in version 3.2
db.collection.replaceOne() New in version 3.2

In MongoDB, update operations target a single collection. All write operations in MongoDB are atomic on the level of a single document.

You can specify criteria, or filters, that identify the documents to update. These filters use the same syntax as read operations.

The components of a MongoDB updateMany operation.

For examples, see Update Documents.

Delete Operations¶

Delete operations remove documents from a collection. MongoDB provides the following methods to delete documents of a collection:

db.collection.deleteOne() New in version 3.2
db.collection.deleteMany() New in version 3.2

In MongoDB, delete operations target a single collection. All write operations in MongoDB are atomic on the level of a single document.

You can specify criteria, or filters, that identify the documents to remove. These filters use the same syntax as read operations.

The components of a MongoDB deleteMany operation.

For examples, see Delete Documents.

Bulk Write¶

MongoDB provides the ability to perform write operations in bulk. For details, see Bulk Write Operations.

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