Method for accessing SQL databases

[Magnus Bergman <magnus bergman observer net>]

I'm about to write a Gnome-VFS module for accessing SQL databases
(primary MySQL and Oracle). And I was wondering if there is some kind of
standard related to mapping a URL to an SQL query. And if I'm forced to
hack something myself I would appreciate opinions from others.

I imagine it could look something like this:
scheme://[[user[:password] ]host[:port]]/[database]?query

Or perhaps instead of query:
[table[,table...][:field[,field...][:primary_key=value]]]

There didn't seem to be anything suitable here:
http://www.iana.org/assignments/uri-schemes

But I found the following related URI schemes:

HTDB     Couldn't find enough information to determine whether this is
         suitable. It looks promising.

JDBC     This is apparently widely used but from what I can see it only
         addresses the database, and can not be used to access any
         specific data.

mysql    I would be stupid to use this for accessing a non-MySQL server,
         even if it perhaps would work fine.