# File lib/og/backends/mysql.rb, line 158
        def self.calc_field_index(klass, og)
                res = og.query "SELECT * FROM #{klass::DBTABLE} LIMIT 1"
                meta = og.managed_classes[klass]
        
                for idx in (0...res.num_fields)
                        meta.field_index[res.fetch_field.name] = idx
                end
        end