PowerBuilder Classic and PowerBuilder .NET can use OData datasources.

OData (the Open Data Protocol) is a Web protocol for querying and updating data that
provides a way to unlock your data and free it from silos that exist in applications.
OData is based on REST (Representational State Transfer). It uses the standard HTTP
protocol to access data using GET, PUT, POST, and DELETE.

At runtime, users can retrieve and manipulate data.

• Database Profile Setup – OData Dialog Box
  Define a database profile to access an OData service in PowerBuilder using the OData interface.
• Database Painter
  You can connect to the OData service and work with it in the Database painter.
• Create a DataWindow Using an OData Service
  Select the OData Service datasource in the DataWindow wizard.
• Set the Connection Information for the OData Service
  As with other databases, use the SQLCA Transaction object (or user-defined transaction object) to retrieve and display data from the OData service in a DataWindow or DataStore.