Re: xpath

Allan,

Postgres is very strict on variable types and char conversion. I have a
feeling you are trying to access data from a varchar feild using an
integer...

Can you paste here your schema for that table?

P.

On Wed, Feb 10, 2010 at 11:06 AM, Allan Kamau <kamauallan(at)gmail(dot)com> wrote:

> Hi,
> I am running postgreSQL-8.4.2. I have a table that stores a single xml
> document per row in one of it's fields. I would like to use xpath to
> retrieve portions of these xml documents.
> Is there a way to do so. (I am running postgreSQL 8.4.2 configured
> (built) with --with-libxml and --with-libxslt options)
>
> I have looked at 'xpath' but I am unable to get it work for table fields.
>
> The command below works.
> SELECT xpath('/doc/name/@first','<doc><name first="David"
> last="Marston"/>...</doc>');
>
> The command below seems not to execute successfully
> SELECT a.id,xpath('/doc/name/@first',a.xml_payload) FROM
> staging.simple_table a WHERE a.id=1;
>
> HINT: No function matches the given name and argument types. You
> might need to add explicit type casts.
>
>
> Allan.
>
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