Message-ID: <014d01c2d6e3$aff25610$8401a8c0@yudie>
From: "Yudie" <yudie@axiontech.com>
To: <pgsql-sql@postgresql.org>
References: <009c01c2d6c6$fb985b90$8401a8c0@yudie>
	<200302171256.59403.josh@agliodbs.com>
Subject: Re: Format Function
Date: Mon, 17 Feb 2003 18:21:28 -0600
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OK thanks for the answer.
I made my function with plpgsql to do formating,
It's not perfect but at least make it easy to do simple formating
==============================================
CREATE FUNCTION myformat(text,text) returns text as'
 DECLARE
  i integer;
  n integer;
  strtemp text;

 BEGIN
  i := length($2);
  n := length($1);
  strtemp='''';

  WHILE i > 0 AND n > 0 LOOP
   IF substr($2,i,1) = ''#'' THEN
    strtemp := substr($1,n,1) || strtemp;
    n := n - 1;
   ELSE
    strtemp := substr($2,i,1) || strtemp;
   END IF;

   i := i - 1;
  END LOOP;

  return strtemp;
 END
' language 'PLPGSQL'


----- Original Message -----
From: "Josh Berkus" <josh@agliodbs.com>
To: "Yudie" <yudie@axiontech.com>; <pgsql-sql@postgresql.org>
Sent: Monday, February 17, 2003 2:56 PM
Subject: Re: [SQL] Format Function


Yudie,

> Is there any default function for formating string in postgre sql?
> for instance:
> Format('123ABCDE', '####-###-###') => '12-3AB-CDE'
>
> The closest function I know is the to_char() function but it only works
for
numbers

No, there isn't.  You could write one, though.  For example, you could
write:

(7.3 syntax)

CREATE FUNCTION yudie_format(text) RETURNS text AS
'SELECT SUBSTR($1, 1, 4) || ''-'' || SUBSTR($1,5,3) || ''-'' ||
SUBSTR($1,9,4);
' LANGUAGE SQL IMMUTABLE STRICT;

As a simple formatting function.

For that matter, it would be the work of a weekend for someone to write a
function in PL/Perl which would take a format mask and apply it to any text
string.

--
-Josh Berkus
 Aglio Database Solutions
 San Francisco