晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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# $Id: GetInfoReturn.pm 8696 2007-01-24 23:12:38Z Tim $
#
# Copyright (c) 2002  Tim Bunce  Ireland
#
# Constant data describing return values from the DBI getinfo function.
#
# You may distribute under the terms of either the GNU General Public
# License or the Artistic License, as specified in the Perl README file.

package DBI::Const::GetInfoReturn;

use strict;

use Exporter ();

use vars qw(@ISA @EXPORT @EXPORT_OK %GetInfoReturnTypes %GetInfoReturnValues);

@ISA = qw(Exporter);
@EXPORT = qw(%GetInfoReturnTypes %GetInfoReturnValues);

my
$VERSION = "2.008697";

=head1 NAME

DBI::Const::GetInfoReturn - Data and functions for describing GetInfo results

=head1 SYNOPSIS

The interface to this module is undocumented and liable to change.

=head1 DESCRIPTION

Data and functions for describing GetInfo results

=cut

use DBI::Const::GetInfoType;

use DBI::Const::GetInfo::ANSI ();
use DBI::Const::GetInfo::ODBC ();

%GetInfoReturnTypes =
(
  %DBI::Const::GetInfo::ANSI::ReturnTypes
, %DBI::Const::GetInfo::ODBC::ReturnTypes
);

%GetInfoReturnValues = ();
{
  my $A = \%DBI::Const::GetInfo::ANSI::ReturnValues;
  my $O = \%DBI::Const::GetInfo::ODBC::ReturnValues;
  while ( my ($k, $v) = each %$A ) {
    my %h = ( exists $O->{$k} ) ? ( %$v, %{$O->{$k}} ) : %$v;
    $GetInfoReturnValues{$k} = \%h;
  }
  while ( my ($k, $v) = each %$O ) {
    next if exists $A->{$k};
    my %h = %$v;
    $GetInfoReturnValues{$k} = \%h;
  }
}

# -----------------------------------------------------------------------------

sub Format {
  my $InfoType = shift;
  my $Value    = shift;

  return '' unless defined $Value;

  my $ReturnType = $GetInfoReturnTypes{$InfoType};

  return sprintf '0x%08X', $Value if $ReturnType eq 'SQLUINTEGER bitmask';
  return sprintf '0x%08X', $Value if $ReturnType eq 'SQLINTEGER bitmask';
# return '"' . $Value . '"'       if $ReturnType eq 'SQLCHAR';
  return $Value;
}


sub Explain {
  my $InfoType = shift;
  my $Value    = shift;

  return '' unless defined $Value;
  return '' unless exists $GetInfoReturnValues{$InfoType};

  $Value = int $Value;
  my $ReturnType = $GetInfoReturnTypes{$InfoType};
  my %h = reverse %{$GetInfoReturnValues{$InfoType}};

  if ( $ReturnType eq 'SQLUINTEGER bitmask'|| $ReturnType eq 'SQLINTEGER bitmask') {
    my @a = ();
    for my $k ( sort { $a <=> $b } keys %h ) {
      push @a, $h{$k} if $Value & $k;
    }
    return wantarray ? @a : join(' ', @a );
  }
  else {
    return $h{$Value} ||'?';
  }
}

1;