UI5应用通过单个SAP Gateway访问双后端（SAP/非SAP）可行性咨询

Hey there! Great question—using a single SAP Gateway to connect your UI5 app to both SAP and non-SAP backends is absolutely feasible, and your existing Gateway experience will make this process way smoother. Let’s break down the practical ways to implement this:

1. Build Separate OData Services (Simplest Starting Point) #

Leverage your existing SEGW skills to create two distinct OData services in Gateway:

• SAP Backend Service: Continue with the standard workflow you already know—generate a service from CDS views, RFCs, or BAPIs, and configure it to route requests to your SAP system.
• Non-SAP Backend Proxy Service: Create a custom OData service where you implement the Data Provider Class (DPC) to act as a middleman. In the DPC methods (like GET_ENTITY or GET_ENTITYSET), use ABAP’s CL_HTTP_CLIENT library to send requests to your non-SAP system’s API, transform the incoming response into the OData model format, and return it to your UI5 app.

2. Combine Services into a Unified Endpoint (Optional) #

If you want your UI5 app to consume one single OData service instead of two, you have two solid options:

• Gateway Service Composition: Create a parent OData service that references both your SAP-backed and non-SAP-backed services as external dependencies. This lets you expose a combined data model, so your UI5 app can query both backends through a single endpoint.
• Custom Composite Service: Build a single OData service where your DPC logic routes requests to the appropriate backend (SAP or non-SAP) based on which entity set is being accessed. For example, requests for Customers go to SAP, while ExternalOrders go to the non-SAP system.

3. Critical Things to Keep in Mind #

• Authentication Setup: Ensure your Gateway has valid credentials to connect to both systems. For non-SAP backends, this might mean configuring HTTP basic auth, OAuth 2.0, or API keys in the ABAP HTTP client settings.
• Data Transformation: You’ll need to map the non-SAP system’s data structure to match your OData model. Use ABAP tools like XSLT transformations or ABAP mapping functions to handle this conversion cleanly.
• Performance Optimization: Add caching layers in Gateway for non-SAP data that doesn’t update frequently—this reduces redundant API calls and speeds up your UI5 app’s response times.

Pro tip: Start with a small proof-of-concept. Build a simple test service that fetches a single dataset from your non-SAP system first, then integrate it with your existing SAP service. This way you can validate each step without disrupting your current app.

内容的提问来源于stack exchange，提问作者Gunni3