mongodbHow to bulk update documents in MongoDB?

MongoDB provides a bulk update operation to update multiple documents in a single operation. The syntax for bulk update is as follows:

db.collection.update(
   <query>,
   <update>,
   {
     upsert: <boolean>,
     multi: <boolean>,
     writeConcern: <document>
   }
)

• <query>: Specifies the selection criteria for the update.
• <update>: Specifies the modifications to be made to the documents that match the query.
• upsert: Optional. If set to true, creates a new document when no document matches the query criteria.
• multi: Optional. If set to true, updates multiple documents that meet the query criteria. If set to false, updates one document.
• writeConcern: Optional. A document expressing the write concern.

For example, the following operation updates all documents in the collection that have a qty field equal to 0 with an updatedQty field equal to 20:

db.collection.update(
   { qty: 0 },
   { $set: { updatedQty: 20 } },
   { multi: true }
)

Helpful links

• MongoDB Documentation - Bulk Write Operations

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