Hm... it really works, but where are benefits of OOP? ;)
There is no inheritance at all, and to access parent's properties I should call
parent directly, so inheritance just replaced with incapsulation, and it's no
one what i try to find.
Some years ago we have implemented inheritance in ORM in some commercial
project in Perl, later I have swithed to java and have found Hibernate it
really cool with ORM.
But now I have returned to Perl and I think that DBIx::Class can help me with
ORM, but right now i'm confused that cannot find "standard" solution for
typical task.
15.06.2012, 10:25, "Hailin Hu" <i...@h2l.name>:
> Is it acceptable like something below
>
> package Target;
> ...
> package Host;
> ...
> __PACKAGE__->belong_to('target' => 'Target', 'target_id');
> sub column_only_exists_in_target {
> my $self = shift;
> return $self->target->column_only_exists_in_target;
> }
>
> well, it is not a good solution, but it could work, I think :)
>
> On Fri, Jun 15, 2012 at 3:04 PM, Alex Erzin <eaa-h...@yandex.ru> wrote:
>
>> Hello,
>>
>> I need to implement table-per-class inheritance, as it simple made in
>> Hibernate in Java (more details can be found here
>> http://docs.jboss.org/hibernate/orm/4.1/manual/en-US/html/ch10.html#inheritance-tablepersubclass),
>> but cannot find right way how to do it in DBIx::Class.
>>
>> For example, I have two objects: Target (with properties ID, Description)
>> and Host (ID, Hostname, IP), Host inherited from Target, and on table-level
>> there are two tables Host and Target, joined by ID field.
>>
>> CREATE TABLE `mydb`.`target` (
>> `target_id` INT NOT NULL ,
>> `description` VARCHAR(45) NULL ,
>> PRIMARY KEY (`target_id`) )
>>
>> CREATE TABLE `mydb`.`host` (
>> `target_id` INT NOT NULL ,
>> `hostname` VARCHAR(45) NULL ,
>> `ip` VARCHAR(45) NULL ,
>> PRIMARY KEY (`target_id`) ,
>> CONSTRAINT `fk_host_target`
>> FOREIGN KEY (`target_id` )
>> REFERENCES `mydb`.`target` (`target_id` )
>> )
>>
>> How to implemeng there classes Target and Host, so it possible to write
>>
>> print $target->id(), $targer->description()
>> print $host->id(), $host->description(), $host->hostname(), $host->ip()
>>
>> ?
>>
>> I have no ideas how to implement inheritance, and all my experiments are
>> failed - from Host i cannot get access to parent properties like description.
>> Could you help me please (with examples)?
>>
>> Thanks.
>>
>> --
>> eaa@
>>
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>
> _______________________________________________
> List: http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/dbix-class
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--
eaa@
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