public function safeUp()
{
// Create the craft_fields table
craft()->db->createCommand()->createTable('formbuilder2_fields', array('fieldId' => array('column' => 'integer', 'required' => false), 'fieldLayoutId' => array('column' => 'integer', 'required' => false), 'template' => array()), null, true);
// Add foreign keys to craft_fields
craft()->db->createCommand()->addForeignKey('formbuilder2_fields', 'fieldId', 'fields', 'id', 'CASCADE', null);
craft()->db->createCommand()->addForeignKey('formbuilder2_fields', 'fieldLayoutId', 'fieldlayouts', 'id', 'CASCADE', null);
}