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$transaction = Yii::app()->db->beginTransaction();
try {
	$post = new Post;
	$post->title = "test post 1";
	if ($post->save()) {

		$comment = new Comment;
		$comment->body = "test comment 1";
		$comment->post_id = $post->id;

		if ($comment->save()) {
			$transaction->commit();
			echo "Transaction Commit Success !!";
		}
		else {
			$transaction->rollBack();
			echo "Can't Save \"Comment\" and Transaction Roll Back";
		}
	}
	else {
		$transaction->rollBack();
		echo "Can't Save \"Post\" and Transaction Roll Back";
	}
}
catch(Exception $ex) {
	$transaction->rollBack();
	echo $ex->getMessage();
}