From sgnerd@yahoo.com.sg Thu Nov  27 06:53:29 2003
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Reply-To: "Kumar" <sgnerd@yahoo.com.sg>
From: "Kumar" <sgnerd@yahoo.com.sg>
To: "psql" <pgsql-sql@postgresql.org>
Subject: Equivalent of Reverse() functions
Date: Thu, 27 Nov 2003 12:20:24 +0530
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Dear Friends,

I am migrating an SQL Server 2000 database to Postgres 7.3.4 running on RH =
Linux 7.2. While migrating I encounter SQL Server REVERSE( ) function, seem=
s no such functions at Postgres.

Is there a equivalent function available at Postgres? Please shed some light

Regards
Kumar

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<DIV><FONT size=3D2>Dear Friends,</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>I am migrating an SQL Server 2000 database to Postgres =
7.3.4=20
running on RH Linux 7.2. While migrating I encounter SQL Server REVERSE( )=
=20
function, seems no such functions at Postgres.</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>Is there a equivalent function available at Postgres? P=
lease=20
shed some light</FONT></DIV>
<DIV><FONT size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2>Regards</FONT></DIV>
<DIV><FONT size=3D2>Kumar</FONT></DIV>
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From mail@joeconway.com Thu Nov  27 07:27:00 2003
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To: Kumar <sgnerd@yahoo.com.sg>
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Subject: Re: Equivalent of Reverse() functions
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Kumar wrote:
> I am migrating an SQL Server 2000 database to Postgres 7.3.4 running
> on RH Linux 7.2. While migrating I encounter SQL Server REVERSE( )
> function, seems no such functions at Postgres.
> 
> Is there a equivalent function available at Postgres? Please shed
> some light

How about:

create or replace function reverse(text) returns text as '
  return reverse($_[0]);
' language plperl;

regression=# select reverse('abcdef');
  reverse
---------
  fedcba
(1 row)

Joe





From greg@turnstep.com Sat Nov  29 17:51:41 2003
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
 
 
> I am migrating an SQL Server 2000 database to Postgres 7.3.4 running
> on RH Linux 7.2. While migrating I encounter SQL Server REVERSE( )
> function, seems no such functions at Postgres.
>
> Is there a equivalent function available at Postgres? Please
> shed some light
 
No. If you have plperl installed, as somebody already posted, you can
take advantage of perl's built in reverse() function. Here is a
plpgsql version:
  
CREATE OR REPLACE FUNCTION reverse(TEXT) RETURNS TEXT AS '
  DECLARE
    original ALIAS FOR $1;
    reversed TEXT := \'\';
    onechar  VARCHAR;
    mypos    INTEGER;
  BEGIN
    SELECT LENGTH(original) INTO mypos;
    LOOP
      EXIT WHEN mypos < 1;
      SELECT substring(original FROM mypos FOR 1) INTO onechar;
      reversed := reversed || onechar;
      mypos := mypos -1;
    END LOOP;
    RETURN reversed;
  END
' LANGUAGE plpgsql IMMUTABLE RETURNS NULL ON NULL INPUT;
  
pg=> SELECT reverse('A man, a plan, a canal, Panama');
 
            reverse
- --------------------------------
 amanap ,lanac a ,nalp a ,nam A
 
 
- --
Greg Sabino Mullane greg@turnstep.com
PGP Key: 0x14964AC8 200311291246
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