++++ One-To-One

Binding One-To-One foreign key associations is done with {{Doctrine_Record::ownsOne()}} and {{Doctrine_Record::hasOne()}} methods. In the following example user owns one email and has one address. So the relationship between user and email is one-to-one composite. The relationship between user and address is one-to-one aggregate.

The {{Email}} component here is mapped to {{User}} component's column {{email_id}} hence their relation is called LOCALKEY relation. On the other hand the {{Address}} component is mapped to {{User}} by it's {{user_id}} column hence the relation between {{User}} and {{Address}} is called FOREIGNKEY relation.

<code type="php">
class User extends Doctrine_Record {
    public function setUp() {
        $this->hasOne('Address','Address.user_id');
        $this->ownsOne('Email','User.email_id');
        $this->ownsMany('Phonenumber','Phonenumber.user_id');
    }
    public function setTableDefinition() {
        $this->hasColumn('name','string',50);
        $this->hasColumn('loginname','string',20);
        $this->hasColumn('password','string',16);

        // foreign key column for email ID
        $this->hasColumn('email_id','integer');
    }
}
class Email extends Doctrine_Record {
    public function setTableDefinition() {
        $this->hasColumn('address','string',150);
    }
}
class Address extends Doctrine_Record {
    public function setTableDefinition() {
        $this->hasColumn('street','string',50);
        $this->hasColumn('user_id','integer');
    }
}
</code>


++++ One-to-Many, Many-to-One

<code type="php">
class User extends Doctrine_Record {
    public function setUp() {
        $this->ownsMany('Phonenumber','Phonenumber.user_id');
    }
    public function setTableDefinition() {
        $this->hasColumn('name','string',50);
        $this->hasColumn('loginname','string',20);
        $this->hasColumn('password','string',16);
    }
}
class Phonenumber extends Doctrine_Record {
    public function setTableDefinition() {
        $this->hasColumn('phonenumber','string',50);
        $this->hasColumn('user_id','integer');
    }
}
</code>


++++ Tree structure

<code type="php">
class Task extends Doctrine_Record {
     public function setUp() {  
        $this->hasOne('Task as Parent','Task.parent_id');
        $this->hasMany('Task as Subtask','Subtask.parent_id');
    }
    public function setTableDefinition() {
        $this->hasColumn('name','string',100);
        $this->hasColumn('parent_id','integer');
    }
}
</code>