On Tue, Jul 13, 2010 at 4:03 AM, ced45 <cedric.duprez@xxxxxx> wrote:
>
> Hi List,
>
> I have trouble using XPath name() function in a XML field.
> For example, when I execute the following query :
>
> SELECT XPATH('name(/*)', XMLPARSE(DOCUMENT '<unit>value</unit>'))
>
> I would like to get "unit", but I just get an empty array ({}).
> How can I get "unit" ?
postgres is slightly broken in this regard. here is some discussions
and a (might not work anymore) patch to fix the behavior if you're
feeling adventurous...
http://www.mail-archive.com/pgsql-hackers@xxxxxxxxxxxxxx/msg143339.html
here is a 'works for my cases but probably not all of yours' regex
solution that I use sometimes:
create or replace function xnode(_xml xml) returns text as
$$
select substring($1::text from '^<([[:alnum:]]+).*>');
$$ language sql immutable;
merlin
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