# File lib/dbi/handles/statement.rb, line 168
        def column_types
            sanity_check
            return @coltypes unless @coltypes.nil?
            @coltypes = @handle.column_info.collect do |col| 
                if col['dbi_type']
                    col['dbi_type']
                else
                    DBI::TypeUtil.type_name_to_module(col['type_name'])
                end
            end
        end