def _get_table_info(self):
        """Database-specific method to get field names"""
        self.rowid = None
        self.fields = []
        self.field_info = {}
        self.cursor.execute('DESCRIBE %s' %self.name)
        for row in self.cursor.fetchall():
            field,typ,null,key,default,extra = row
            self.fields.append(field)
            self.field_info[field] = {'type':typ,'NOT NULL':null,'key':key,
                'DEFAULT':default,'extra':extra}
            if extra == 'auto_increment':
                self.rowid = field
Database-specific method to get field names