Hands-On Serverless Computing

Trigger

The Azure Cosmos DB Trigger listens to the messages sent to the Azure Cosmos DB change feed for inserts and updates to data across partitions. The change feed doesn't publish deletes; it only does inserts and updates.

Let's look at how we can create a trigger for Cosmos DB through Azure Portal:

1. Select your Azure Function from the Function Apps page
2. Navigate to Integrate
3. Click on New Trigger
4. Choose Azure Cosmos DB

The preceding steps can be seen in the following screenshot:

5. Click Select at the bottom
6. On the next page, follow the instructions to provide the necessary information for Cosmos DB:
   • Database name
   • Collection name
   • Collection ...