Re: function replace doesnt exist - Mailing list pgsql-sql

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mallah.


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Home -> Postgres -> CookBook Home -> View One Recipe Submitted on: 03-16-2001
Description:
mimic oracle's replace function. versions in pltcl and plpgsql.

Code:

-- by Jonathan Ellis (jbellis@hotmail.com)
-- licensed under the GPL
-- emailing me improvements is appreciated but not required

-- args: string substring replacement_substring
create function replace (varchar, varchar, varchar) returns varchar as '   -- escape out characters that regsub would
treatas special   regsub -all {&} "$3" {\\\&} 3   regsub -all {\\[0-9]} "$3" {\\\0} 3   eval "regsub -all \{$2\} \{$1\}
\{$3\}rval"   return $rval
 
' language 'pltcl';

-- plpgsql version so we don't have to jump through hoops to call it from other functions
create function replace (varchar, varchar, varchar) returns varchar as '
declare   string alias for $1;   sub alias for $2;   replacement alias for $3;   -- xxxxxxxxxxx[MATCH]xxxxxxxxxxxx   --
         | end_before   --                   | start_after   match integer;   end_before integer;   start_after
integer;  string_replaced varchar;   string_remainder varchar;
 
begin   string_remainder := string;   string_replaced := '''';   match := position(sub in string_remainder);
   while match > 0 loop       end_before := match - 1;       start_after := match + length(sub);       string_replaced
:=string_replaced || substr(string_remainder, 1, end_b
 
efore) || replacement;       string_remainder := substr(string_remainder, start_after);       match := position(sub in
string_remainder);  end loop;   string_replaced := string_replaced || string_remainder;
 
   return string_replaced;
end;
' LANGUAGE 'plpgsql';

















On Thursday 12 December 2002 10:04 pm, Andy Morrow wrote:
> Hi
>
> im trying to execute an update command on a postgresql DB table using
> pgAdmin II
>
> im using the following statement
>
> UPDATE commandlist SET command = REPLACE (command,'A','B')
>
>
> commandlist is the table name
> command is the column
> and i want to change the value A to B
>
>
> but it's giving me the following error message
>
>
> an error has occured in pgAdmin II:frmSQLInput.cmdExecute_Click:
>
> Number: -2147467259
> Description: Error while executing the query;
> ERROR: Function'replace(varchar, unknown, unknown)' does not exist
> Unable to identify a function that satisfies the given argument types
> You may need to add explicit typecasts
>
>
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-- 
Rajesh Kumar Mallah,
Project Manager (Development)
Infocom Network Limited, New Delhi
phone: +91(11)6152172 (221) (L) ,9811255597 (M)

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