MongoDB Delete One Document

MongoDB Delete One Document

In MongoDB, the deleteOne operation is used to remove a single document from a collection that matches a specified filter. This method is essential for managing and maintaining data integrity within MongoDB collections.

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Syntax

db.collection.deleteOne(filter, options)

The deleteOne method takes a filter to specify which document to remove and an optional options parameter to customize the deletion.

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Example MongoDB Delete One Document

Let's look at an example of how to use the deleteOne method in the programGuru collection in MongoDB:

1. Delete a Single Document

db.programGuru.deleteOne({ name: "John Doe" })

This command deletes a single document where the name is John Doe in the programGuru collection.

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Full Example

Let's go through a complete example that includes switching to a database, creating a collection, inserting documents, and deleting a single document.

Step 1: Switch to a Database

This step involves switching to a database named myDatabase.

use myDatabase

In this example, we switch to the myDatabase database.

Step 2: Create a Collection

This step involves creating a new collection named programGuru in the myDatabase database.

db.createCollection("programGuru")

Here, we create a collection named programGuru.

Step 3: Insert Documents into the Collection

This step involves inserting documents into the programGuru collection.

db.programGuru.insertMany([
    { name: "John Doe", age: 30, email: "john.doe@example.com" },
    { name: "Jane Smith", age: 25, email: "jane.smith@example.com" },
    { name: "Jim Brown", age: 35, email: "jim.brown@example.com" }
])

We insert multiple documents into the programGuru collection.

Step 4: Delete a Single Document from the Collection

This step involves using the deleteOne method to remove a document from the programGuru collection.

db.programGuru.deleteOne({ name: "John Doe" })

We delete a single document where the name is John Doe.

Conclusion

The MongoDB deleteOne operation is crucial for managing data within collections. Understanding how to use this method allows you to efficiently remove specific documents, ensuring data integrity and proper management in MongoDB collections.