[Zope3-Users] Database access problem from form support Class

[Cliff Ford]

Zope-3.2.0: I have a MySQL database Utility installed that works fine 
via its Test tab, via an SQL Script, and with that script called from a 
page template. I want to to use a simple query from a class that 
supports a form in a context that has nothing to do with the database. 
The code I have tried looks like this:


from zope.app.rdb import queryForResults
from zope.app.rdb.interfaces import IZopeDatabaseAdapter

class EditRoles:
     """This class reads a form data and updates Permissions """

     def getPrincipals(self):
         try:
             connection = zapi.getUtility(IZopeDatabaseAdapter, 'mysql')
         except KeyError:
             raise AttributeError("The database connection '%s' cannot be "
                                  "found." % ('mysql'))
         query = "select * from z3users"
         result = queryForResults(connection, query)

And when I try to invoke the form I get this error

   File "/usr/local/Zope320i/lib/python/cefsite/browser/editroles.py", 
line 47, in getPrincipals
     result = queryForResults(connection, query)
   File 
"/home/ceford/temp/Zope-3.2.0/build/lib.linux-i686-2.4/zope/app/rdb/__init__.py", 
line 401, in queryForResults
     cursor = conn.cursor()
AttributeError: 'MySQLdbAdapter' object has no attribute 'cursor'

Can anyone suggest what I might be missing or suggest another way of 
accessing the database?

Cliff