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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 ([EMAIL PROTECTED])
-- 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 treat as 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)
Visit http://www.trade-india.com ,
India's Leading B2B eMarketplace.
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