Using Persistent package with ODBC-databases throw HDBC-odbc.
Functionality is very bounded because there are no schema modification possibilities in general.
Beside that, Persistent has some assumptions about table structures which is not always possible to provide in all databases.
E.g. hdbc-odbc transform Oracle's NUMBER into SqlString value,
but Persistent want to have PersistInt64 value for keys. I don't see a way to provide that.
Anyway, with this package we can do at least low-level queries from Persistent to any databases.