Insert Documents
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This page provides examples of insert operations in MongoDB.
Note
Creating a Collection
If the collection does not currently exist, insert operations will create the collection.
Insert a Single Document
To retrieve the document that you just inserted, query the collection:
Insert Multiple Documents
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Insert Behavior
Collection Creation
If the collection does not currently exist, insert operations will create the collection.
_id Field
In MongoDB, each document stored in a collection requires a unique
_id field that acts as a primary key. If an inserted
document omits the _id field, the MongoDB driver automatically
generates an ObjectId for the _id field.
This also applies to documents inserted through update operations with upsert: true.
Atomicity
All write operations in MongoDB are atomic on the level of a single document. For more information on MongoDB and atomicity, see Atomicity and Transactions
Write Acknowledgement
With write concerns, you can specify the level of acknowledgement requested from MongoDB for write operations. For details, see Write Concern.