topic Re: declaring field symbools in Application Development and Automation Discussions

declaring field symbools

Former Member — Thu, 03 Apr 2008 21:08:20 GMT

Hi,

Can any one explain the following declarations?

Types: begin of ty_ltap,

lgnum like ltap-lgnum,

tanum like ltap-tanum,

tapos like ltap-tapos,

end of ty_ltap.

data: lt_ltap type standard table of ty_ltap,

wa_ltap type ty_ltap.

1) field-symbols: <fs_ltap> type ty_ltap.

can i use :

loop at lt_ltap into <fs_ltap>.

---

endloop.

when i this it gives a short dump. what is the error?

2) what is the defference if i use :

assign wa_ltap to <fs_ltap>.

Re: declaring field symbools

b_deterd2 — Thu, 03 Apr 2008 21:11:17 GMT

loop at lt_tap assigning <fs_ltap> should work !

Re: declaring field symbools

Former Member — Thu, 03 Apr 2008 21:11:35 GMT

Try


loop at lt_ltap ASSIGNING <fs_ltap>.

Re: declaring field symbools

Former Member — Thu, 03 Apr 2008 22:08:10 GMT

DATA: new_line TYPE REF TO data.

FIELD-SYMBOLS: <fs_inttab> TYPE STANDARD TABLE.

DATA: lv_tab_name TYPE dd02l-tabname.

CREATE DATA new_line TYPE STANDARD TABLE OF (lv_tab_name).

ASSIGN new_line->* TO <fs_inttab>.

If you write the above logic then it accepts INTO otherwise until runtime it doesn't know the structure so you need to use ASSIGN statement.

Hope it clarifies.

Thanks,

Srinivas

Re: declaring field symbools

Former Member — Thu, 03 Apr 2008 22:20:53 GMT

Hello,

You use field-symbols when you only know the name of the variables at runtime or in commands such LOOP or READ by performance reasons.

When you use FIELD-SYMBOLS the data is not transported to a work area, in case of internal tables you work directly with the record. So, be carefull when you change the keys of a record, if you're using a sorted table you can get runtime errors.

Regards,