Change the records with abap in internal table

[amine_lamkaissi]

Hi experts,

In an internal table, i have some data. I want to modify all the records contained in the fieldC to a fixed value 'XXXX'

I tought about this treatment:

LOOP AT itab INTO str.
     str2t2 = str.
     str2-fieldC = 'XXXXX'.
     APPEND str2 TO  itab.
     CLEAR str2.
   ENDLOOP.

It's working fine now, but i am afraid about performance in the future. What are you advices?

Any better way to perform it?

Thanks.

Amine

[siva_subramanian2]

Hi Amine,

If you want to Modify the data,then why you are appending the data?You have to modify the table line using workarea after assigning proper value to 'str2-fieldC'.If you append to the same internet table when will the loop ends.I am not sure how come it is working perfect in your case.

Use Modify statement instead of Append.

Thanks

Siva

[Former Member]

Hi Amine,

I'm dont know the structure of your internal Table and also the requirement. If this change is mandatory , then proceed with it. I think, It should not cause any performance issue

In some cases if we want to modify only a some records. U can try this also.

str2-fieldC = 'XXXX'.

modify itab into str transporting fieldC where fieldC = Value1 or fieldA = Value2. " Here the fieldC would be modified where fieldA has Value -> Value 1 or Value2

Thanks

Vivek

[edgar_nagasaki]

Hi Amine,

I really don't see any concerns from performance perspective once to perfom LOOP without any specific condition (as your case) normaly is done quite fast. But a question about your code purposes, you're adding new entry at each loop performed, is this what you need? I'm affraid you could have an endless loop.

Maybe you should use MODIFY instead.

Regards,

Edgar

[former_member491621]

Hi Amine,

Rather than using loop you can use modify statement.

MODIFY itab FROM str TRANSPORTING fieldC WHERE <your condition>.

where str is your work area containing your required value.

You may choose not to specify any condition.

Hope this helps

[Former Member]

Try using Modify Internal Table Statement From Workarea

using Where and Transporting Clauses.

Let me know if it works.

Thanks

Gaurav

[vigneshyeram]

Dear Amine,

Please go throught this below code where a field symbol is used you need not to modify or append the table.

Ty_itab can be structure, type or table.

FIELD-SYMBOLS : <fs_field> TYPE  ty_itab.

                                itab TYPE STANDARD TABLE OF ty_itab.

unassign :  <fs_field>.

loop at itab assigning <fs_field>.

<fs_field>-fieldC = 'XXXXX'.

endloop.

Above code is enough.

Hope this helps you.
Kindly let me know.

Thanks & Regards,

Vignesh Yeram

[adam_krawczyk1]

Hi,

All solutions given in post are correct. However solution from Vignesh that uses assigning will be the fastest for many rows in itab and I would recommend it. Assign statement works on reference and there is no need of row copying to work area like in case of loop. Memory operations are anyhow fast, but in case of very large table this will make some difference.

Regards

Adam

[Former Member]

Hi,

Instead of the append u can use the modify statement which doesnot give any impact on ur performance.

1. LOOP AT itab INTO str. 
2.      strstr2t2 = str. 
3.      str2-fieldC = 'XXXXX'. 
4.   modify  itab from str2 transporting fieldc.
5. 
   
6. *     APPEND str2 TO  itab. 
7.      CLEAR str2. 
8.    ENDLOOP.

[raymond_giuseppi]

Is this your actual code, you are looping at the internal table, together appending new records, so that can generate an  endless loop, and trigger memory exhaustion and dump  once initial table is not empty ?

From LOOP AT itab

If you insert rows after the current row, these new rows will be processed in the subsequent loop passes. An endless loop can result.

Read first some documentation like processing Statements for Internal Tables in Abap Internal Tables online documentation.

Regards,
Raymond

[amine_lamkaissi]

Thanks to all guys for your explanations.

Amine

[amine_lamkaissi]

Just one detail guys,

str is not a structure in my example, but a workarea.

Everything is working fine

Amine

[Former Member]

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[Former Member]

Hi,

Friends

Please take 1 example and give beef explanation with code also..

Thanks,

Roopa.k