NotORM，在一个方法中执行两次相同得sql查询，sql查询条件叠加？

	public function test()

	{

		$model = $this->getORM();

		$attr = [

			'member_id' => $memberId,

			'talker_id' => $talkerId

		];

		$talkId = $model->select('id')->where($attr)->fetchOne('id');

		if (empty($talkId)) {

			$attr = [

				'member_id' => $talkerId,

				'talker_id' => $memberId

			];

			$talkId = $model->select('id')->where($attr)->fetchOne('id');

			return $talkId;

		}

		return $talkId;

	}