change documents with modify statement

[Former Member]

Hi,

I have implemented change docs for an own application. I use the functional moduls (not only the generated one) because there is a little bit extra stuff around it.

Anyhow I face a problem with I have not yet identified.

My question: can i use "modify" statement to update into a table with change document or do I need to use update and insert separatly? I use "modify" and asked myself whether this is the problem.

I just hope that someone of you has the answer out of the box so I dont have to figure that out by my own...

Thanks!

[venkat_o]

Hi Eddie, Here we go. The differences between UPDATE and MODIFY In case of UPDATE

<li>
UPDATE sflight FROM TABLE sflight_tab.
<li>If there is no row in the database with the same content of the primary key for a row in the internal table, or if the change would lead to a double entry in a unique secondary key, the respective row is not changed and sy-subrc is set to 4.

In case of MODIFY

<li>
MODIFY t100 FROM TABLE message_wa.
<li>If there is no row in the database with the same content of the primary key for a row in the internal table, record is created and subrc is set to 0. or if the change would lead to a double entry in a unique secondary key, the respective row is changed and sy-subrc is set to 0.

Thanks Venkat.O

[Former Member]

Hello,

UPDATE works only when a data which needs to be changed exists in a table. If you try to update a record which is non existant then sy-subrc is returned as 4. Nothing happens in this case.

MODIFY works as a combination of UPDATE and INSERT. If a record exists then it is updated with new values but if it does not exist then a new records is created and added to the table.

Hope this clarifies your doubt regarding in issue that you are facing.

Regards,

Sachin

[Former Member]

Hello Eddie,

The differance between insert , update and modify is as follows.

INSERT - Inserts a new record. INSERT expects that a record with the required key does NOT exist in the table. Therefore, if a record with the same key already exists, a runtime error occurs.

UPDATE -Update an existing record. UPDATE expects that a record with required key exists in the table. If a record with the required key does not exist, it issue an error (sy-subrc is 4).

MODIFY - Acts like a combination of INSERT and UPDATE. If a record with the specified key does not exist, it adds it to the table. If a record with the specified key does exist, it modifies it. So MODIFY actually acts like "Insert or change record".

To summarize:

INSERT - Adds a new record to the table. If the row (key) exists, issues an error.

UPDATE - Updates an existing record to the table. If the row (key) does not exist, issues an error.

MODIFY - If the key exists, modifies the record. If the key does not exist, adds the record to the table.

Regards,

Soundarya.

[Former Member]

Thank you all for your answers.

Maybe I was not so clear with what my question is:

I know that modify acts as an insert or an update. But can I use this statement in order to create a change record?

I only saw examples with update and insert and the change indicator only has insert of update.

My application uses modify and does not work. But I have quite a bit development around the change documents

and just wanted to get feedback whether my modify statements are the problem.

But i think I will just write a small program and test it in a small standard environment.

Thanks for you help!

[Former Member]

Hi ,

i think this is helpful for u...

TYPES: BEGIN OF ty_str ,
       r1(10) TYPE c,
       r2(10) TYPE c,
       END OF ty_str.
DATA: it_str TYPE TABLE OF ty_str,
      wa_str LIKE LINE OF it_str.

data: lv_r1 TYPE string,
      lv_r2 TYPE string.

      lv_r1 = 10.
      lv_r2 = 20.
wa_str-r1 = lv_r1.
wa_str-r2 = lv_r2.

APPEND wa_str to it_str.
CLEAR wa_str.
wa_str-r1 = '100'.
wa_str-r2 = '200'.

APPEND wa_str to it_str.
CLEAR wa_str.
wa_str-r1 = '55'.
wa_str-r2 = '66'.
INSERT wa_str INTO it_str INDEX 2.
CLEAR wa_str.
wa_str-r1 = '155'.
wa_str-r2 = '166'.
APPEND wa_str to it_str.
CLEAR wa_str.

DELETE it_str INDEX 4.
*MODIFY TABLE it_str FROM wa_str .

    LOOP AT it_str INTO wa_str.
        read TABLE it_str INTO wa_str INDEX 2.
        if sy-subrc = 0.
       wa_str-r1 = 'roopa'.
        MODIFY it_str FROM  wa_str INDEX 1 .
        endif.
    ENDLOOP.

LOOP AT it_str INTO wa_str.
  WRITE:/ wa_str-r1, wa_str-r2.
ENDLOOP.

Thanks,

roopa.k