In the example of code you have, the loop will exit if your key (variable ID)
is equal to an empty string or a string that can be evaluated to zero for
example values like these:
0E1,0E10, 0E100 (on Universe)
"" (empty string)
0000
Will make the loop end:
> SELECT FILENAME
> LOOP
> READNEXT ID ELSE EXIT
> WHILE ID DO
> CODE
> CODE with GOSUB
> CODE
> CODE
> REPEAT
Try:
SELECT FILENAME
LOOP WHILE READNEXT ID
CODE...
REPEAT
----- Original Message ----
From: George Gallen <ggal...@wyanokegroup.com>
To: "u2-users@listserver.u2ug.org" <u2-users@listserver.u2ug.org>
Sent: Friday, February 27, 2009 10:21:19 AM
Subject: RE: [U2] Strange happening...
that wasn't the case. The id was combination of 13 letters and numbers.
The strange part was where the while/do seemed to kick in.
The item was read from the file without a problem
3-4 lines of code execute as expected
it then executed a gosub, but when it returned, it dropped out of the loop
the id variable was never modified.
Strange.
George
> -----Original Message-----
> From: owner-u2-us...@listserver.u2ug.org [mailto:owner-u2-
> us...@listserver.u2ug.org] On Behalf Of Edward Brown
> Sent: Friday, February 27, 2009 9:39 AM
> To: u2-users@listserver.u2ug.org
> Subject: RE: [U2] Strange happening...
>
> If the ID equates to false it will exit - i.e. a record with ID 000000
>
> Edward
>
> -----Original Message-----
> From: owner-u2-us...@listserver.u2ug.org
> [mailto:owner-u2-us...@listserver.u2ug.org] On Behalf Of George Gallen
> Sent: 27 February 2009 14:26
> To: Ardent
> Subject: [U2] Strange happening...
>
> ok...I found this code snipit (REALITY FLAVOR)
>
> SELECT FILENAME
> LOOP
> READNEXT ID ELSE EXIT
> WHILE ID DO
> CODE
> CODE with GOSUB
> CODE
> CODE
> REPEAT
>
>
> What was happening was the loop was exiting early, but it was exiting
> after
> the
> CODE with GOSUB line was executed.
>
> What struck me was why there was a While DO as well as an EXIT in the
> loop?
> while nothing in the CODE or GOSUBs modified the ID, would having both
> the
> WHILE/DO and EXIT cause some kind of problem?
>
> After I removed (commented out) the WHILE/DO line, the program ran as
> expected
> and processed the 100,000 records, (whereas before it stopped after 6).
>
> George
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