Re: COPY use in function with variable file name

On Wed, 2003-01-29 at 08:05, Sondaar Roelof wrote:
> Hello,
>
> I can't figure out how to make this work, or is not possible?
>
> In a function i would like to read a file.
> The file name is determined by a value from a table.
> However the COPY statement does not to accept this?
> I tried various forms of adding (single)-quotes but no luck.
>
> Anyone any ideas?
>
> Function:
> CREATE FUNCTION dnsdhcp_dns_raw()
> /* Fill table dns_raw with dns data */
> RETURNS integer AS '
> DECLARE
> r RECORD;
> ntw TEXT;
> BEGIN
> /* Do for all domain names */
> FOR r IN SELECT domain FROM network
> WHERE position(''n'' IN use) > 0 and ipaddress != ''127.0.0.0/24''
> LOOP
> ntw := ''/tmp/db.'' || r.domain;
> DELETE FROM dns_raw; /* Clear table */
> RAISE NOTICE ''Network: %'', ntw;
> COPY dns_raw FROM ntw DELIMITERS ''~''; /* Get the data */

Since ntw has variable content, you need to do an EXECUTE with the
command in a text string:
EXECUTE ''COPY dns_raw FROM '' || ntw || '' DELIMITERS ''''='''''';

(I hope that is the right number of quotes!)

> END LOOP;
> RETURN 0;
> END;'
> LANGUAGE 'plpgsql';

--
Oliver Elphick Oliver(dot)Elphick(at)lfix(dot)co(dot)uk
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