ThinkPHP v3.2.3 数据库读写分离，开启事务时报错：There is no active transaction

如题：ThinkPHP v3.2.3 数据库读写分离，开启事务时报错：

ERR: There is no active transaction

刚开始以为是数据表引擎不对造成的，因为 有几张表的引擎是 MyISAM，后来调整过来了，改为 InnoDB，还是报错。应该是TP 底层连数据库时，切换数据库连接时出了点问题，解决方案如下：

打开文件 ThinkPHP/Library/Think/Db/Driver.class.php，调整内容如下：

/**
 * 启动事务
 *
 * @access public
 * @return void
 */
public function startTrans() {
	$this->initConnect(true);
	if ( !$this->_linkID ) return false;
	// 数据rollback 支持
	if ($this->transTimes == 0) {
		//$this->_linkID->beginTransaction(); // by 52php.cnblogs.com
		foreach ($this->linkID as $_linkId) {
			$_linkId->beginTransaction();
		}
	}
	$this->transTimes++;
	return ;
}

/**
 * 用于非自动提交状态下面的查询提交
 *
 * @access public
 * @return boolean
 */
public function commit() {
	if ($this->transTimes > 0) {
		//$result = $this->_linkID->commit(); // by 52php.cnblogs.com
		foreach ($this->linkID as $_linkId) {
			$result = $_linkId->commit();
		}

		$this->transTimes = 0;
		if(!$result){
			$this->error();
			return false;
		}
	}
	return true;
}

/**
 * 事务回滚
 *
 * @access public
 * @return boolean
 */
public function rollback() {
	if ($this->transTimes > 0) {
		//$result = $this->_linkID->rollback(); // by 52php.cnblogs.com
		foreach ($this->linkID as $_linkId) {
			$result = $_linkId->rollback();
		}

		$this->transTimes = 0;
		if(!$result){
			$this->error();
			return false;
		}
	}
	return true;
}

问题解决！