Assistance class in Web dynpro ABAP

Question

step 1: Create WEB DYNPRO component. Example: Zwd_assist_class_test.
             -save.
            -Active.  
step 2: Assistance class on component(Zwd_assist_class_test)  screenwriter assist class name Example:Asistance_class.
step3: Select the Assistance class name click on pop up new window .
step4:Assistance class window methods  give method name
step5: Select parameters of the methods  giving importing exporting table ,objects.
step6:Select Attributes button given the attribute name Example:ET_MAR.
For example methods READ_ONLY.
coding for method: select * from <db_table> into table <ET_tab> where matnr between im_matnr1 and im_matnr2.
I want using MARA,VBAK,VBAP tables data display in single table,creating two search fields .these are VBELN, MATNR
how to write READ_ONLY method ?

Answer 1

Hi Rajasekhar,
The exporting parameters which you have declared can take only one record as its declared as work area. Instead you need to identify the table type and use like
for MARA... MARA_TT
for VBAK... VBAK_T
for VBAP... VBAP_T
but, for your requirement, you need not required to pass mara, vbak, vbap table data, instead you need to put into final internal table ET_result.
I suggest you to create a table type ZTT_RESULT in SE11 which contains all your fields in the output.
Now, inside READ_DATA( ) method you can do as below ( just an example)
loop at lt_mara into ls_mara.
     move-corresponding ls_mara to ls_result.
     loop at lt_vbap into ls_vbap where matnr = ls_mara-vbeln.   
           move-corresponding ls_vbap to ls_result.
          read table lt_vbak into ls_vbak with key vbeln = ls_vbap-vbeln.
          if sy-subrc is initial.
                    move-corresponding ls_vbak to ls_result.
          endif.
     endloop.
append ls_result to ET_RESULT.
endloop.
Hope this helps you.
Regards,
Rama