# File lib/tapkit/access/sql.rb, line 645
                def sql_for_string( string )
                        if string.nil? then
                                'NULL'
                        else
                                if @encoding then
                                        string = Utilities.encode(string, @encoding)
                                end
                                escape = Regexp.escape sql_escape_char
                                string = string.to_s.gsub(/'/) { "#{escape}'" }
                                "'#{string}'"
                        end
                end