NAME

DBD::ADO::TypeInfo - ADO TypeInfo

SYNOPSIS

use DBD::ADO::TypeInfo();

$\ = "\n";

my $Enums = DBD::ADO::TypeInfo->Enums;

for my $Enum ( sort keys %$Enums )
{
  print $Enum;
  for my $Const ( sort keys %{$Enums->{$Enum}} )
  {
    printf "  %-35s 0x%X\n", $Const, $Enums->{$Enum}{$Const};
  }
}

DESCRIPTION

In the OLE type library, many constants are defined as members of enums. It's easy to lookup DBD::ADO constants by name, e.g.:

$ado_consts->{adChar} == 129

Unfortunately, Win32::OLE::Const does not preserve the namespace of the enums. It's a matter of taste, but I think

$ado_consts->{DataTypeEnum}{adChar} == 129

makes the code more self-documenting.

Furthermore, many DBD::ADO methods return numeric codes. Transforming these codes into human readable strings requires an inverse lookup by value. Building the reverse hash for e.g. all datatypes requires that datatype constants can be distinguished from other constants, i.e. we need the namespace preserved.

The Enums() method of this package return a hash of hashes for exactly this purpose.

AUTHOR

Steffen Goeldner (sgoeldner@cpan.org)

COPYRIGHT

Copyright (c) 2002-2003 Steffen Goeldner. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.