Dynamically accessing components

[Former Member]

Hello Everybody!

I'm a new ABAP developer and experimenting with the language a bit.

I'm having some trouble with something I'm not actually sure is a possibility. I'd like to call components of a structure from a string variable. I know that it's possible to do so with the table it self. I have setup:

DATA:
        column_name type string.

        column_name = 'c1'.

        UPDATE (table_name) SET (column_name) = 'X'
          WHERE LETTER = row.

(table_name) is called via USING by the subroutine. That part is working OK. I also have a try catch block around the UPDATE which catches cx_sy_dynamic_osql_semantics saying that (table_name) has no component named (column_name). Anybody have an idea how to properly execute this?

[ThomasZloch]

Looking at the online help for the UPDATE statement, it seems you'll have to replace

SET (column_name) = 'X'

by

SET (full_expression_syntax)

and prepare the syntax string accordingly.

Thomas

http://help.sap.com/abapdocu_70/en/ABAPUPDATE_SET_EXPRESSION.htm#&ABAP_ADDITION_4@4@

[Former Member]

Hello,

Please try the below code from F1 help of Update

PARAMETERS: table TYPE c LENGTH 30,

column TYPE c LENGTH 30,

old_curr TYPE sycurr.

DATA: set_expr TYPE string,

condition TYPE string.

CONCATENATE column ` = 'EUR'`

INTO set_expr.

CONCATENATE column ` = old_curr`

INTO condition.

TRY.

UPDATE (table)

SET (set_expr)

WHERE (condition).

CATCH cx_sy_dynamic_osql_error.

MESSAGE `Error in update!` TYPE 'I'.

ENDTRY.

Thanks.

Ramya

[Former Member]

Thank you both for the prompt replies!

I had at first tried to do it the way Thomas did, but I didn't realize that I had to pass the entire argument as a string and not just throw the expression in ( ).