Pre Database Insert / Update Validation

Question

Hi,
I have a maintenance view that allow user to insert / update.
Let's say, z_my_table is my table
key1
key2
field1
field2
field3
I want to validate whether field1, field2, field3 whether exist in my table before insert / update.
However, due to some restriction, I cannot make it as part of the key.
My question is, how can I capture OR validate it before the data get inserted into the table ?
I checked some online help, and found that suggestion is to write a function module OR enhancement point.
Just wonder what is the common practice and how should I do it ? Thanks.

Answer 1

I don't agree with the design but if you want to do it anyway it can be done using Events in the Maintenance View.
After you've generated the Maintenance View of your Z table, within SE11 pull out menubar Utilities->Table Maintenance Generator, then menubar Environment->Modifcation->Events. Create New Entries and I think for your requirement you would need 2 entries - one at event 05 and another at event 18. Input the name of your routine and write the code by clicking its corresponding button.
The following is an example of a scenario where text of an object is retrieved and filled into the view display-only column according to user input of its related object id - for your requirement you would validate the user input after checking the input values in your existing table:
form fill_text_05.
  data begin of w_total.
          include structure zfv_fbt_acct_rel.
  data: action,
        mark,
  end of w_total.
  data: w_extract type zfv_fbt_acct_rel.
  clear: zfv_fbt_acct_rel-fbt_rel_acc_txt,
         zfv_fbt_acct_rel-fbt_cost_grp_txt.
* populate GL a/c text
  select txt50 up to 1 rows
         from skat
         into zfv_fbt_acct_rel-fbt_rel_acc_txt
         where spras = sy-langu
         and   saknr = zfv_fbt_acct_rel-fbt_rel_acc.
  endselect.
* populate Cost Group text
  select single fbt_cost_grp_txt
         from  zft_fbt_cost_grp
         into  zfv_fbt_acct_rel-fbt_cost_grp_txt
         where company_code = zfv_fbt_acct_rel-company_code
         and   fbt_cost_grp = zfv_fbt_acct_rel-fbt_cost_grp.
  if sy-subrc <> 0.
    message e074(zf_enhancements) with zfv_fbt_acct_rel-company_code.
  endif.
endform.                    "fill_text_05
Hope this helps.
Cheers,
Sougata.