topic Re: Read Statement in internal table in Application Development and Automation Discussions

Read Statement in internal table

Former Member — Fri, 26 Feb 2021 15:29:27 GMT

program:

REPORT ZDEMO.
DATA: BEGIN OF REC,
COL1 TYPE I,
COL2 TYPE I,
END OF REC.
DATA:ITAB1 LIKE TABLE OF REC WITH NON-UNIQUE KEY COL1.
DO 3 TIMES.
REC-COL1 = SY-INDEX. REC-COL2 = SY-INDEX ** 3.
APPEND REC TO ITAB1.
ENDDO.
LOOP AT ITAB1 INTO REC.
WRITE: / REC-COL1, REC-COL2.
ENDLOOP.
ULINE.
ULINE.
REC-COL1 = 5. REC-COL2 = 8.
READ TABLE ITAB1 FROM REC INTO REC COMPARING COL2.
WRITE: / 'SY-SUBRC = ', SY-SUBRC.
SKIP.
WRITE: / REC-COL1, REC-COL2.

Output:

Ques: why the sy-subrc is coming 4 (not found any entry) while I was searching as: COMPARING COL2. and col2 = 8 is there in the internal table.

Re: Read Statement in internal table

former_member34 — Fri, 26 Feb 2021 15:29:42 GMT

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Re: Read Statement in internal table

joltdx — Fri, 26 Feb 2021 15:50:14 GMT

Hi!

Yeah, COMPARING is not working like that. It can be used to compare fields in the found line. Here's the ABAP Documentation.

The sy-subrc = 4 comes from the fact that there is no line matching rec, that is col1=5 and col2=8.

Re: Read Statement in internal table

Patrick_vN — Fri, 26 Feb 2021 22:46:02 GMT

Wanting to know what the COMPARING statement does, I checked the documentation.. surprise surprise, it seems like instead of pre-fixes like "lt_", we're gonna use post-fixes "_tab" instead? Is that supposed to be clean code? And wait, we don't need to be consistent either, for the second table doesn't have the post-fix.. 😄

DATA: sflight_tab TYPE SORTED TABLE OF sflight
                  WITH UNIQUE KEY carrid connid fldate,
      sflight_wa  LIKE LINE OF sflight_tab,
      output      TYPE TABLE OF string WITH EMPTY KEY.

Re: Read Statement in internal table

matt — Sat, 27 Feb 2021 08:20:10 GMT

Ok so sflight_tab means: table of sflight. No real semantic information there. It's not much better than CONSTANTS c_x VALUE 'X'.

Why would we need the initial S?!

I'd use flights, I guess.

Re: Read Statement in internal table

Sandra_Rossi — Sat, 27 Feb 2021 10:27:43 GMT

(Patrick Van Nierop see Matthew reply to you)

Re: Read Statement in internal table

joltdx — Sat, 27 Feb 2021 15:38:30 GMT

In general, and on this theme, I believe the ABAP documentation is pretty awesome... It's a good balance between describing in simple terms and explaining "advanced" or "deeper" things. It's not too wordy, but clear and concise.

Then there are things like this. I believe COMPARING is an old thing (though I've never used it). But EMPTY KEY is 7.40, right? So at least the doc should've been touhced...