topic Create a fieldcatalog dynamically in Application Development and Automation Discussions

Create a fieldcatalog dynamically

Former Member — Thu, 07 Oct 2010 16:04:26 GMT

Hey everyone,

I need to realize a method which creates dynamically a fieldcatalog. The call of the method looks like this:


  CALL METHOD me->describe_struct_for_fcat
    EXPORTING
      im_tab = it_data. "type: data

I have a vague idea how to do this:

1. get the type of the im_tab

2. Some kind of loop at the type of the im_tab where filling the row for the fcat and appending it to the fcat.

I would be pleased if you can post a code snippet or something, which I can copy.

Looking forward to your answers.

BR Fabian

Re: Create a fieldcatalog dynamically

kesavadas_thekkillath — Thu, 07 Oct 2010 16:13:38 GMT

Hi,

Check the code written in method factory of class CL_SALV_TABLE.

Or wait for our friend Marcin till he gives a clear & detailed explanation

Re: Create a fieldcatalog dynamically

naimesh_patel — Thu, 07 Oct 2010 16:52:05 GMT

As Keshav T suggested, use the SALV model to generate the ALV for your dynamic table. You can look the program SALV_DEMO_TABLE_SIMPLE.

Regards,

Naimesh Patel

Re: Create a fieldcatalog dynamically

Former Member — Thu, 07 Oct 2010 19:01:44 GMT

try this, but note, you will have do figure out how to get the correct length and decimals for field types P or I

REPORT  ZCA_BOB_CL_ABAP_STRUCTDESCR_X.


Data: r_descr type REF TO cl_abap_structdescr,
      wa_comp TYPE abap_compdescr.


types: begin of wa_int_tab,
        mandt type mandt,
        matnr type matnr,
        werks type WERKS_D,
        lgort type LGORT_D,
        min_qty type MINLF,
       end of wa_int_tab.
data: it_int_tab TYPE STANDARD TABLE OF wa_int_tab.
data: wk_int_tab like LINE OF  it_int_tab.


Data: wk_length(6) type n,
      wk_decimals(6) type n.

START-OF-SELECTION.


 r_descr ?= cl_abap_typedescr=>describe_by_data( wk_int_tab ).

 Loop at r_descr->components into wa_comp.
   If wa_comp-type_kind = 'C'
   or wa_comp-type_kind = 'D'
   or wa_comp-type_kind = 'N'.
    Divide wa_comp-length by 2.
  Else.
** go out to tables DD03L and  DD04L to get LENG and DECIMALS
  Endif.
   write:/ wa_comp-name,
           wa_comp-type_kind,
           wa_comp-length,
           wa_comp-decimals.

 EndLoop.

Re: Create a fieldcatalog dynamically

Former Member — Thu, 07 Oct 2010 19:22:25 GMT

Hi Bob,

thank you so much for your post! That is exactly what i was looking for!! Perfect!