MongoDB Update Many Documents

MongoDB Update Many Documents

In MongoDB, the updateMany operation is used to update multiple documents within a collection based on a specified filter. This method is essential for making bulk modifications to documents in MongoDB collections.

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Syntax

db.collection.updateMany(filter, update, options)

The updateMany method takes a filter to specify which documents to update, an update document to specify the modifications, and an optional options parameter to customize the operation.

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Example MongoDB Update Many Documents

Let's look at some examples of how to use the updateMany method in the programGuru collection in MongoDB:

1. Update Multiple Documents

db.programGuru.updateMany(
    { age: { $gt: 30 } },
    { $set: { status: "senior" } }
)

This command finds all documents where the age field is greater than 30 and updates the status field to senior.

2. Update Documents with Options

db.programGuru.updateMany(
    { age: { $lt: 30 } },
    { $set: { status: "junior" } },
    { upsert: false }
)

This command finds all documents where the age field is less than 30 and updates the status field to junior without inserting a new document if no match is found.

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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 updating multiple documents.

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: Update Multiple Documents in the Collection

This step involves using the updateMany method to update multiple documents in the programGuru collection.

Update Multiple Documents

db.programGuru.updateMany(
    { age: { $gt: 30 } },
    { $set: { status: "senior" } }
)

We find all documents where the age field is greater than 30 and update the status field to senior.

Update Documents with Options

db.programGuru.updateMany(
    { age: { $lt: 30 } },
    { $set: { status: "junior" } },
    { upsert: false }
)

We find all documents where the age field is less than 30 and update the status field to junior without inserting a new document if no match is found.

Conclusion

The MongoDB updateMany operation is crucial for making bulk modifications to documents in collections. Understanding how to use this method allows you to efficiently manage and update data within MongoDB collections.