oData(Part2)- Read Operation

Read Operation with GET_ENTITY .

The post describes how to implement the data provider extension class for the READ operation. [ Check the link oData- Part1 to create the entity type, entity set and runtime artifatcs.]

The SCARR table entries.

We have the project. In the entity data model ‘Carrid’ is the only key.

Go to the data provider extension class- ZCL_ZSCARR_DEMO_DPC_EXT. Right click on it and choose Go to ABAP workbench.

Select change mode. Select the method: SCARRS_GET_ENTITY and click on the redefine button.

Now when we request with the URL

https://server address/sap/opu/odata/sap/ZSCARR_DEMO_SRV/Scarrs(‘AA’), the IT_KEY_TAB is filed with the key value pair and return as a structure ER_ENTITY.

Put the below code:

    DATA: lv_carrid TYPE scarr–carrid.
    CHECK it_key_tab IS NOT INITIAL.
    DATA(ls_key) = it_key_tab[ 1 ].
    lv_carrid = ls_key–value.
    SELECT SINGLE * FROM scarr INTO CORRESPONDING FIELDS OF er_entity
                    WHERE carrid = lv_carrid.