Service Layer

🚀 Service Layer

The Service Layer is responsible for exposing projection views (root and child entities) as OData services. This enables external applications—such as SAP Fiori apps and third-party systems—to interact with the Fleet Management application in a standardized way.

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📌 Service Definition

The Service Definition specifies which projection views are made available to consumers as part of the OData service.

@EndUserText.label: 'Service Definition -- Fleet MGMT -- Projection Views'
define service ZAKS_SD_FLEET_MGMT {
  expose ZAKS_P_ROOT_VEHICLE    as Fleet;
  expose ZAKS_P_CDS_TRIP        as Trip;
  expose ZAKS_P_CDS_MAINTENANCE as Maintenance;
}

What this does:

• ZAKS_P_ROOT_VEHICLE is exposed as the Fleet entity set.
• ZAKS_P_CDS_TRIP is exposed as the Trip entity set.
• ZAKS_P_CDS_MAINTENANCE is exposed as the Maintenance entity set.

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🔗 Service Binding

The Service Binding connects the service definition to a protocol and scenario—in this case, to OData V2 – UI—to make the service consumable by applications.

• Service Binding Name: ZAKS_SB_FLEET_MGMT
• Service Definition Used: ZAKS_SD_FLEET_MGMT
• Binding Type: OData V2 – UI

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📂 Entity Sets & Associations

Once the service is published, the following entity sets and associations are available in the OData service:

• Fleet
  • to_Maintenance (1:n composition: Vehicles to Maintenance records)
  • to_Trip (1:n composition: Vehicles to Trip records)
• Trip
  • to_Vehicle (n:1 navigation: Trip back to Fleet)
• Maintenance
  • to_Vehicle (n:1 navigation: Maintenance back to Fleet)

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📸 Service Binding Screenshot

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✅ Next Steps

• Test the OData service using the endpoint:
  /sap/opu/odata/sap/ZAKS_SB_FLEET_MGMT
  (Try in a browser, in Postman, or using SAP Gateway Client)
• Use the Preview feature in Eclipse ADT to validate entity sets and navigation.
• Generate a Fiori Elements app using this service binding for rapid UI development.

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With this setup, your Fleet Management System is ready for seamless consumption by SAP Fiori Elements and external clients via OData!

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