Using a DDS Trigger

Prerequisites

Before creating a trigger, ensure that you have prepared the following:

• You have created a function. For details, see Creating a Function from Scratch.
• You have enabled VPC access for the function. For details, see Configuring the Network.
• You have created a DDS DB instance.
• You have created a DDS database.

Creating a DDS Trigger

1. Log in to the FunctionGraph console. In the navigation pane, choose Functions > Function List.
2. Click the function to be configured to go to the function details page.
3. Choose Configuration > Triggers and click Create Trigger.
   Figure 1 Creating a trigger
   

4. Set the following parameters:
   • Trigger Type: Select Document Database Service (DDS).
   • DB Instance: Select a DDS DB instance.
   • Password: Enter the password of DDS DB instance administrator rwuser.
   • Database: Enter the name of a database. Note that admin, local, and config are reserved database names and cannot be used here.
   • Collection: Enter the name of a database collection.
   • Batch Size: Set the number of records to be read from the database at a time.

5. Click OK.
   NOTE:

   After VPC access is enabled, you need to configure corresponding subnet permissions for the DDS security group. For details about how to configure VPC access, see Configuring the Network.

Configuring a DDS Event to Trigger the Function

1. Return to the FunctionGraph console. In the navigation pane, choose Functions > Function List.
2. Click the function to be configured to go to the function details page.
3. On the function details page, select a version, and click Test. The Configure Test Event dialog box is displayed.
4. Set the parameters described in Table 1 and click Save.

   Table 1 Test event information

   Parameter	Description
   Configure Test Event	You can choose to create a test event or edit an existing one. Use the default option Create new test event.
   Event Template	Select Document Database Service (DDS) to use the built-in DDS event template.
   Event Name	The event name can contain 1 to 25 characters and must start with a letter and end with a letter or digit. Only letters, digits, underscores (_), and hyphens (-) are allowed. For example, dds-123test.
   Event data	The system automatically loads the built-in DDS event template, which is used in this example without modifications.

5. Click Test. The function test result is displayed.