[Zope] how to generically get a list of tables and columns from a db connector

Hi, the browse-tab of db connectors offer a listing of tables and columns. How can I access this in python script independent of the db connection(without a sql-query or zsql_method). In the class db.py under class db there is a tables() and columns() method but I didn't find a way of accessing them in a script yet. Also a query() method should be possible to circumvent zsql-Methods more flexibly? Does anybody know the how to? -- Elena