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MongoDB - MongoDB CRUD Operations

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. All write operations in MongoDB are atomic on the level of a single document.

MongoDB - MongoDB CRUD Operations - 文章图片

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.

MongoDB - MongoDB CRUD Operations - 文章图片

For examples, see Query Documents.

 

Update Operations

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

  • db.collection.update()
  • 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.

MongoDB - MongoDB CRUD Operations - 文章图片

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.remove()
  • 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.

MongoDB - MongoDB CRUD Operations - 文章图片

For examples, see Delete Documents.

 

Bulk Write

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

 

MongoDB - MongoDB CRUD Operations

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本文系统来源：http://www.cnblogs.com/huey/p/6120472.html

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