02-28-2012
Fantastic, It works perfectly!
Thanks agama!
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LEARN ABOUT DEBIAN
tangram::intro
Tangram::Intro(3pm) User Contributed Perl Documentation Tangram::Intro(3pm)
NAME
Tangram::Intro - an introduction to Tangram
SYNOPSIS
# http://www.faqs.org/rfcs/rfc2324.html
perl -MNet::HTCPCP -le 'Net::HTCPCP->new("BREW")->send'
perldoc Tangram::Intro
YIN AND YANG OF OBJECT PERSISTENCE
There are yin and yang approaches to object persistence. Are you a yin programmer or a yang programmer?
yin (without, empty) - "I just want to store my objects"
yang
(with, full) - "I want my database to represent my object structure"
Please skip to the introduction that suits you.
YIN OBJECT PERSISTENCE (A LA PIXIE)
One yin approach is to have a single table of objects -
+----+------------------+
| ID | DATA |
+----+------------------+
This is the raw technique used by modules like MLDBM. Stick objects in, get a tag (or, insert with a tag), and later present that tag to
get the objects out.
Modules like Pixie extend this concept, to allow you to have objects that are persistent (ie, have been stored and could be retrieved again
by ID or name), inside other structures that are also persistent. This is achieved without storing the same structure twice, without hav-
ing to fetch all objects that are in a single persistent structure, and without requiring that the objects being stored even know that they
are being stored.
Fantastic. This method is fine for any application that doesn't mind single threading data manipulation on objects.
Enough banter, let's see some code; here's a project schema:
package MyProject::Tangram;
use Heritable::Types;
use Tangram::Core;
use Tangram::Type::Dump::Any;
our $schema =
Tangram::Schema->new
( { classes =>
[ HASH => {
fields => {
idbif => # poof!
undef
},
},
],
} );
sub db { Tangram::Storage->new($schema, @_) }
This defines a sort of "store anything" schema. You could deploy your database like this:
my $dbh = DBI->connect
("dbi:mysql:tangram", "user", "pass");
Tangram::Relational->deploy ( $MyProject::Tangram::schema,
$dbh );
And then shove objects in and out like this:
use MyProject::Tangram;
my $storage = MyProject::Tangram::db
("dbi:mysql:tangram", "user", "pass");
my $object = bless { first_name => "Homer",
last_lame => "Simpson",
}, "NaturalPerson";
my $oid = $storage->insert($object);
my $homer = $storage->load($oid);
If this Pixie-like functionality is all you're after, then you can stop there, and isn't much slower than Pixie. You also get the choice
of whether you want to freeze data structures in your database via "Data::Dumper", "Storable" or "YAML".
YANG OBJECT PERSISTENCE
If you wish to enable concurrency without paying a large performance penalty for most standard types of data access, then you may need to
extract single parts of your objects into columns. That way, you can make the most use of your database's (hopefully) highly tuned and
refined ability to cache and manipulate data indices.
In that case, you may choose to start with mapping all of your object's properties to database columns (as was the only option before Tan-
gram 2.08):
package MyProject::Tangram;
use Tangram::Core;
our $schema =
Tangram::Schema->new
( { classes =>
[ NaturalPerson => {
fields => {
string => {
},
integer => {
}
},
},
],
} );
sub db { Tangram::Storage->new($schema, @_) }
Tangram has been transaction-savvy since version 1. So long as you are careful to flush Tangram's object cache, before you start doing
selects that lock rows for update, then you can easily write transaction protected programs.
perl v5.8.8 2006-03-29 Tangram::Intro(3pm)