Need code for Generic Extraction using FM using multiple tables.

Question

Hi Experts,
We are doing a generic functional module extraction based on four tables - say,
Table TT1 u2013 with fields AA, BB.
Table TT2 u2013 with fields CC, DD.
Table TT3 u2013 with fields EE, FF.
Table TT4 u2013 with fields GG, HH.
The value of the field BB = DD.
The value of the field DD = FF.
The value of the field FF = HH.
The key field with which we have to extract data is AA.
We have created a structure for the above tables u2013 say STR containing all the fields from the above tables.
Now as such all the data from the tables is in the internal table ITF.
This data from the internal table is passed to the structure STR.
Somewhere, I think we are making a mistake. I do not know where.
When we check the datasource extraction in RSA3, we find that there is data only from the Table TT1. Data from other tables does not populate in the datasource.
We do not know where we went wrong.
Kindly help us.
Thanking you all in advance.
With Kind Regards,
Shreeem.

Answer 1

Hi,
You will have to use the select query with joins as given in the below example,
SELECT  pcarrid pconnid ffldate bbookid
  INTO  CORRESPONDING FIELDS OF TABLE itab
  FROM  ( ( spfli AS p
            INNER JOIN sflight AS f ON pcarrid = fcarrid AND
                                       pconnid = fconnid    )
            INNER JOIN sbook   AS b ON bcarrid = fcarrid AND
                                       bconnid = fconnid AND
                                       bfldate = ffldate     )
  WHERE p~cityfrom = 'FRANKFURT' AND
        p~cityto   = 'NEW YORK'  AND
        fseatsmax > fseatsocc.
But I would suggest you to better create a Data base View with all the required tables and then use that view for data selection in your FM.
Regards,
Durgesh.