Binding actions
Vadalog language supports data source binding through the @bind annotation. Vadacode improves user experience with binding with a set of specific actions.
@input binding actions
When you declare an @input binding, you get two handy inlay buttons: Test binding and Infer schema….
Action: Test binding
This action allows you to test the binding by executing a stub Vadalog program that the binding runs without any errors. It is useful for verifying that the binding is correctly set up and that the data can be retrieved as expected; in case of errors, the action will show an error message with details about the issue, coming directly from the Vadalog Engine.
Action: Infer schema…
With Vadacode you can even infer the schema of the data source you are binding to.
Under the hood, this action executes a stub Vadalog program that, thanks to a copy rule, inputs facts from the data source and outputs them for being read by Vadacode. The schema is then inferred from received data, and Vadacode enriches the @input binding with @mapping statements and the input predicate documentation using Vadoc format.
| This feature requires the external reasoner. |
The user is requested for the number of rows to read from the data source to infer the schema.
| Due to how Vadalog reads input data, the user is requested for the number of columns to infer the schema for; if the specified number of columns is greater than the actual number of columns in the data source, the inference will fail. |