Step 5: Create the External Function for AWS in Snowflake¶
This topic provides instructions for creating an external function object in Snowflake. This object stores information about the remote service, such as the parameters that the remote service accepts. The instructions are the same regardless of whether you are using the AWS Management Console or the AWS CloudFormation template.
External functions in Snowflake are database objects, meaning they must be created in a schema in a database. To create an external function, you must have the appropriate privileges on the database and schema where you are creating the function.
For more details, see Access control privileges.
Create the External Function¶
Return to the Snowflake web interface (where you earlier typed the
CREATE API INTEGRATION command).
CREATE EXTERNAL FUNCTIONcommand. It should look similar to the following:
CREATE EXTERNAL FUNCTION my_external_function(n INTEGER, v VARCHAR) RETURNS VARIANT API_INTEGRATION = <api_integration_name> AS '<resource_invocation_url>';
Customize the command:
<api_integration_name>value should contain the name of the API integration that you created earlier.
<resource_invocation_url>value should be the
Resource Invocation URLyou recorded in the worksheet. Make sure that this URL includes the API Gateway resource name, not just the stage name.
You might also want to customize the function name.
This example passes two arguments (an INTEGER and a VARCHAR ) because those are the arguments that the Lambda function expects. When you create your own Lambda function, you must pass appropriate arguments for your Lambda function.
Record the name of the external function in the
External Function Namefield in your tracking worksheet.
If you have not already executed the CREATE EXTERNAL FUNCTION command that you typed above, execute it now.
Test Your External Function¶
You should now be able to call your external function to verify that it works correctly.
For details, see Calling an External Function for AWS.
None. If you were able to call the function, then you’ve successfully created an external function for AWS.