RE: a pl/sql question
- From: "Davey, Alan" <Alan.Davey@xxxxxxxxxxxxxxxxx>
- To: "'oracle-l@xxxxxxxxxxxxx'" <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 30 Apr 2004 10:19:30 -0600
Hi Donald,
My example was only meant to show that sql%notfound would never be hit. One
of these days I'll learn to add comments to my code ;-)
Regards,
-----------------------------------------
Alan Davey
Tech Lead
Oracle 9i OCA; 3/4 OCP
w) 973.267.5990 x458
w) 212.295.3458
-----Original Message-----
From: Freeman, Donald [mailto:dofreeman@xxxxxxxxxxx]
Sent: Friday, April 30, 2004 11:12 AM
To: Oracle-L (E-mail)
Subject: FW: a pl/sql question
> The difference in this case is your example selects into a variable
=
instead of directly updating the table. I followed up on this by =
reading the PL/SQL manual (RTFM?) and there are several warnings about =
using cursor attributes including one similiar to your example. What I =
wrote is only good for the narrow usage I showed ;-). On page 6-40 of =
the 9.2 PL/SQL Users Guide is:
>=20
> "If a SELECT INTO statement fails to return a row,
PL/SQL raises =
the predefined
> exception NO_DATA_FOUND whether you check %NOTFOUND
on the next =
line or not.
> Consider the following example:
> BEGIN
> ...
> SELECT sal INTO my_sal FROM emp WHERE empno =3D
my_empno;
> -- might raise NO_DATA_FOUND
> IF SQL%NOTFOUND THEN -- condition tested only when
false
> ... -- this action is never taken
> END IF;
> The check is useless because the IF condition is
tested only when =
%NOTFOUND is
> false. When PL/SQL raises NO_DATA_FOUND, normal
execution stops and =
control
> transfers to the exception-handling part of the
block."
> =20
> > An update that doesn't update any records is not an exception =
error.
> >=20
> > Trying to select multiple record values or no record values=20
> > when you expect
> > to always get one and only one value is an exception, so that=20
> > logic won't
> > work in this situation.
>=20
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