Get Example source ABAP code based on a different SAP table
ABAP_EML - READ, Operation Executing Functions This example demonstrates how a READ statement can be used to access a managed RAP BO and execute a function. In this case, a selected set of fields is read from a RAP BO entity by executing a function. Data model The CDS data model consists of the root entity DEMO_SPFLI_FLIGHTS and its child entity DEMO_SFLIGHT. The root entity represents flight schedule data and the child entity represents flight details. Root entity: DDLS DEMO_SPFLI_FLIGHTS Child entity: DDLS DEMO_SFLIGHT Behavior definition The RAP behavior definition DEMO_SPFLI_FLIGHTS is defined in RAP BDL as follows: BDEF DEMO_SPFLI_FLIGHTS Behavior implementation For the above RAP behavior definition, one ABAP behavior pool (ABP) is created. The global class of the behavior pool is BP_DEMO_SPFLI_FLIGHTS. This global class implements the local handler class LHC_DEMO_SPFLI_FLIGHTS. The actual implementation takes place in the BP_DEMO_SPFLI_FLIGHTS=========CCIMP. In the example, the FunctionResultEntity method comprises an ABAP EML read operation reading the values of a selected set of fields from the entity DEMO_SPFLI_FLIGHTS according to specific keys that are specified in the internal table following the ... EXECUTE FunctionResultEntity FROM ... statement in the report.
ABAP_DESCRIPTION Access with ABAP using EML The above source code uses EML to access the RAP business object from an ABAP class:
The READ statement executes the function FunctionResultEntity for those entity instances whose keys are specified in the internal table following the ... EXECUTE FunctionResultEntity FROM ... statement.
The outcome of the function execution is stored in the table result . In this case, the function FunctionResultEntity first reads a selected set of fields from RAP BO instances. Then, a calculation is carried out if a selected field has a certain value (the distance of a flight connection is converted to kilometers if the distance is stored as miles). The read result is then passed to the result table.
To display the result of the read operation, an internal table is set up and filled with the values returned by the read operation.
