Обсуждение: cursors

On 24/11/2007, Cesar Alvarez <c.alvarezx66@gmail.com> wrote:
>
>  Hello every one.
>  im trying to make a Loop and i found in the manual this.
>
>  FOR <target> IN <query> LOOP
>      <statements>
>  END LOOP
>
>  Can i use cursor instead of the Query in the loop?? ,
>  this es more legible than using the open/fetch/close of the cursor.
>
>  Regard Cesar Alvarez.

Hello

FOR statement use cursor internally. If you wont to use cursor
explicitly, you have to use WHILE loop.

Regards
Pavel Stehule

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On 24/11/2007, Cesar Alvarez <c.alvarezx66@gmail.com> wrote: 

 Hello every one.im trying to make a Loop and i found in the manual this.
FOR <target> IN <query> LOOP    <statements>END LOOP
Can i use cursor instead of the Query in the loop?? ,this es more legible than using the open/fetch/close of the cursor.
Regard Cesar Alvarez.   

Hello

FOR statement use cursor internally. If you wont to use cursor
explicitly, you have to use WHILE loop.

Regards
Pavel Stehule
 

---------------------------(end of
broadcast)---------------------------
TIP 6: explain analyze is your friend


   

On 24/11/2007, Cesar Alvarez <c.alvarezx66@gmail.com> wrote:
>
>  Thanks,
>  what will be the syntax for that type of for?
>

DECLARE
  curs2 CURSOR FOR SELECT * FROM tenk1;
  c1 integer;
  c2 integer;
BEGIN
  OPEN curs2;
  FETCH curs2 INTO c1,c2;
  WHILE found LOOP
    ...
    FETCH curs2 INTO c1,c2;
  END LOOP;
  CLOSE curs2;

http://www.postgresql.org/docs/8.2/interactive/plpgsql-control-structures.html#PLPGSQL-CONTROL-STRUCTURES-LOOPS

Regards
Pavel Stehule


>
>  Pavel Stehule wrote:
>  On 24/11/2007, Cesar Alvarez <c.alvarezx66@gmail.com> wrote:
>
>
>  Hello every one.
>  im trying to make a Loop and i found in the manual this.
>
>  FOR <target> IN <query> LOOP
>  <statements>
>  END LOOP
>
>  Can i use cursor instead of the Query in the loop?? ,
>  this es more legible than using the open/fetch/close of the cursor.
>
>  Regard Cesar Alvarez.
>
>  Hello
>
> FOR statement use cursor internally. If you wont to use cursor
> explicitly, you have to use WHILE loop.
>
> Regards
> Pavel Stehule
>
>
>
>  ---------------------------(end of
> broadcast)---------------------------
> TIP 6: explain analyze is your friend
>
>
>
>
>
>
>
>