Composite PKs

<?php

class m130726_082858_yii_category_point extends CDbMigration
{
  public function up()
	{
    $this->createTable('yii_category_point', array(
      'category_id'=>'int NOT NULL',
      'point_id'=>'int NOT NULL',
      'PRIMARY KEY (`category_id`, `point_id`)'
    ));
      
    $this->addForeignKey('fk_category_point_point_id', 'yii_category_point', 'category_id', 'yii_category', 'id' );
    $this->addForeignKey('fk_category_point_category_id', 'yii_category_point', 'point_id', 'yii_point', 'id' );
    
	}

	public function down()
	{
    $this->dropTable('yii_category_point');
	}
}