Dynamic challenge

[Former Member]

Hi,

I have a question that is affecting my project delivery :

I have below structure and i want to change the data type of addr field to f or n DYNAMICALLY during runtime.

TYPES : BEGIN OF st_demo,

reg_no(10) TYPE c,

name(20) TYPE c,

addr(20) TYPE c,

END OF st_demo.

DATA : wa_demo TYPE st_demo,

it_demo TYPE TABLE OF st_demo,

Can anyone guru in abap advice me.

[Former Member]

Dear MercAMG,

sure.

This is an easy one.

You need to use FIELD SYMBOLS.... don't be afraid of them.

;o)

Here's the code with explanations.

REPORT  zrq.
* Ricardo Quintas 2011/09

* Here you declare your 2 field symbols
FIELD-SYMBOLS <field_n> TYPE n.
FIELD-SYMBOLS <field_d> TYPE d.

TYPES : BEGIN OF st_demo,
            reg_no(10) TYPE c,
            name(20) TYPE c,
            addr(20) TYPE c,
END OF st_demo.

* Now you declare your line type
DATA : wa_demo TYPE st_demo.

* And you choose dinamically what data type you want to assign 
* your addr field.
* (the IF-ENDIF is just an example)
IF bla bla bla...
  ASSIGN wa_demo-addr TO <field_n> CASTING.
ELSE.
  ASSIGN wa_demo-addr TO <field_d> CASTING.
ENDIF.

* And finally you declare your internal table, with your 
* dinamically created line type. Pay attention to the "LIKE" instead of "TYPE"  
DATA: it_demo LIKE TABLE OF wa_demo.

Just to let you know that you might get errors at run-time if you don't take care of data conflicts.

You've been warned. ;o)

Kind Regards

/Ricardo Quintas

[Former Member]

I resolved it myself using RTTI but thanks for advicing