Call mutiple tables data in single OData service call

Question

Hi,
We have created a ZBAPI same as standard BAPI "ALM_PM_NOTIFICATION_GETDETAIL" for creating an ODATA service. But we are facing problem while calling the data from multiple tables in a single query/entity while creating that ODATA service using SEGW.
Please guide me how can we do that or is this possible to do that.
Thanks,
Shrikant N.

Answer 1

Hello Shrikant,
You mean to say BAPI is returning multiple tables and you have to get all those table data in one call ??
If this is the case you cannot get all the table data from that BAPI in one shot as you can map only 1 table as response table in GW.
Assuming you are passing inputs A & B to your BAPI and it is returning 2 tables in the response,
maintain a Parent entity ( dummy one ) and create association to those tables ( each table as different entity ).
This way you get all the tables data in one go as GW calls your RFC 2 times.
I mean to say you have 2 tables in the BAPI response , GW calls 2 times the same logic to get those 2 tables. i.e., Table 1 in 1st call and Table 2 in 2nd call.
Your URL would be looking like this its just an example :
http://<GW_Host>/sap/opu/odata/sap/<Service_Name>/<Parent>?$filter=A eq 'x' and B eq 'x'&$expand=Table1_Set,Table2_set
where Table1_Set and Table2_Set are your navigation properties which you would have defined.
Also note that here there is a performance trade-off here as GW calls 2 times the same logic and that is how GW calls BE on $expand.
Suggestion is to have separate FM's to get those tables separately so that data retrieval is fasted and there is no overhead.
Regards,
Ashwin