In week 4, you are going to build a UI service for a transactional SAP Fiori elements-based app using the unmanaged runtime implementation which allows the integration of existing business logic (i.e. Brownfield implementation).
The topic of this week is Dealing with Existing Code.
So, we start with having a look at the legacy business logic that we want to leverage for our unmanaged business object implementation.
For this we investigate the sub package /DMO/FLIGHT_LEGACY that resides in the package /DMO/FLIGHT.
The data is read from already existing legacy data base tables /DMO/TRAVEL and /DMO/BOOKING.
In addition, we will use function modules such as /DMO/FLIGHT_TRAVEL_CREATE, /DMO/FLIGHT_TRAVEL_UPDATE or /DMO/FLIGHT_TRAVEL_DELETE that are used to create, update and delete the data in a buffer. We also have a read function module that reads the data from the buffer rather than from the database level that comes handy when implementing the business logic that is required when the business object is called via EML rather than by a SAP Fiori UI. And there is finally a function module that saves the travel and booking data to the database tables.
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