Doctrine_manual-1-2-en

Chapter 15: Inheritance 234
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CREATE TABLE text_item (id BIGINT AUTO_INCREMENT,
topic VARCHAR(100),
PRIMARY KEY(id)) ENGINE = INNODB
CREATE TABLE comment (id BIGINT AUTO_INCREMENT,
topic VARCHAR(100),
content TEXT,
PRIMARY KEY(id)) ENGINE = INNODB
In concrete inheritance you don't necessarily have to define additional columns, but in order
to make Doctrine create separate tables for each class you'll have to make iterative
setTableDefinition() calls.
In the following example we have three database tables called entity, user and group.
Users and groups are both entities. The only thing we have to do is write 3 classes
(Entity, Group and User) and make iterative setTableDefinition() method calls.
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15-13
// models/Entity.php
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class Entity extends Doctrine_Record
{
public function setTableDefinition()
{
$this->hasColumn('name', 'string', 30);
$this->hasColumn('username', 'string', 20);
$this->hasColumn('password', 'string', 16);
$this->hasColumn('created', 'integer', 11);
}
}
// models/User.php
class User extends Entity
{
public function setTableDefinition()
{
// the following method call is needed in
// concrete inheritance
parent::setTableDefinition();
}
}
// models/Group.php
class Group extends Entity
{
public function setTableDefinition()
{
// the following method call is needed in
// concrete inheritance
parent::setTableDefinition();
}
}
Here is the same example in YAML format. You can read more about YAML in the YAML
Schema Files (page 195) chapter:
---
Entity:
columns:
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