Hi Scott,
I think this is more of an SQL question that depends on what database
and table structure you are using, than a GnuGk question.
Anyway, the simple form of such a query could be
select gwip from routes where '%c' like concat(prefix,"%") order by
length(prefix) desc;
This assumes a table routes with a prefix and a gateway ip field.
The query would produce a list of gateways that match the called number
sorted by longest prefix match.
To avoid all the ugly IF handling if nothing matches, I would add a
route with an empty prefix and 'REJECT' in the gateway IP.
Regards,
Jan
ScottC wrote:
>
> I'm trying to use a SQL table to hold my routes and want to search for
> longest match.
> This works using this query.
> select if((select count(*) from h323Routes where alias='%c'),(select hostIP
> from h323Routes where alias='%c'),SUBSTR('%c',1,(LENGTH('%c')-1)))
>
> Now...I want to try to add a second route to be used for failover. When I
> do this, I get "ERROR 1242 (21000): Subquery returns more than 1 row".
> I read on this and it seems to suggest using the keyword ANY, but I can't
> find any examples of this in an IF statement.
>
> Any help would be greatly appreciated.
> Scott
--
Jan Willamowius, [email protected], http://www.gnugk.org/
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