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Re: [BUGS] bug in "fetch" command?

From: Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us>
To: serg(at)gate(dot)informika(dot)ru (Sergey E(dot) Levov)
Cc: hackers(at)postgreSQL(dot)org (PostgreSQL-development)
Subject: Re: [BUGS] bug in "fetch" command?
Date: 1998-08-22 02:32:23
Message-ID: 199808220232.WAA03377@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Can someone comment on this?  Is is a bug?


> ============================================================================
>                         POSTGRESQL BUG REPORT TEMPLATE
> ============================================================================
> 
> 
> Your name		: Sergey E. Levov	
> Your email address	: serg(at)informika(dot)ru
> 
> 
> System Configuration
> ---------------------
>   Architecture (example: Intel Pentium)  	: Intel Pentium Pro
> 
>   Operating System (example: Linux 2.0.26 ELF) 	: FreeBSD 2.2.5
> 
>   PostgreSQL version (example: PostgreSQL-6.3.2)  :   PostgreSQL-6.3.2
> 
>   Compiler used (example:  gcc 2.7.2)		: gcc 2.7.2.1
> 
> 
> Please enter a FULL description of your problem:
> ------------------------------------------------
> When I declare cursor for select statement without "ORDER BY" clause
> ( select * from <tablename> ), and then attempt to fetch record after
> last record in table, or even just give "fetch all" command,
> all the following "fetch" commands, regardless direction, will return 
> an empty result sets.
> If "SELECT" statement has "ORDER BY" clause, all works well.
> 
> 
> 
> Please describe a way to repeat the problem.   Please try to provide a
> concise reproducible example, if at all possible: 
> ----------------------------------------------------------------------
> Try the following sequence of SQL operators:
> 
> begin
> declare mycurs cursor for select * from pg_user
> fetch all in mycurs             - OK
> fetch backward all in mycurs	- fails
> move backward all in mycurs
> fetch all in mycurs		- fails
> close mycurs
> 
> declare mycurs cursor for select * from pg_user order by usename
> fetch all in mycurs		- OK
> fetch backward all in mycurs	- OK
> move backward all in mycurs
> fetch all in mycurs		- OK
> 
> 
> Regards,
> Sergey Levov (serg(at)informika(dot)ru)
> 
> 
> 
> 


-- 
Bruce Momjian                          |  830 Blythe Avenue
maillist(at)candle(dot)pha(dot)pa(dot)us              |  Drexel Hill, Pennsylvania 19026
  +  If your life is a hard drive,     |  (610) 353-9879(w)
  +  Christ can be your backup.        |  (610) 853-3000(h)

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