# File lib/tapkit/access/sql.rb, line 519
                def format_value( value, attribute )
                        case attribute.adapter_value_type
                        when Attribute::ADAPTER_CHARACTERS_TYPE then sql_for_string value
                        when Attribute::ADAPTER_DATE_TYPE       then sql_for_date value
                        when Attribute::ADAPTER_NUMBER_TYPE     then sql_for_number value
                        when Attribute::ADAPTER_BYTES_TYPE      then sql_for_data value
                        else
                                raise "unsupported type: '#{attribute.external_type}'"
                        end
                end