好的,我正在寻找使用PHP在MySQL中进行“嵌套”事务的解决方案,并且正如您在MySQL文档中所知的那样,不可能在事务内进行事务(Mysql transactions within transactions).我试图使用http://php.net/manual/en/pdo.begintransaction.php中建议的Database类,但不幸的是,这对我来说是错误的,因为它的计数器范围是对象级别而不是类级别,为了解决此问题,我创建了具有计数器(名为$nest)的此类(TransactionController)静态的,它带来了使事务“线性”(带有“线性”)所需的类级别：我说的是：它显然是嵌套的,但是如果您看起来它不是嵌套的,那么事务将运行良好,您认为呢？ ？(最后看例子,车主)
class TransactionController extends \\PDO {
public static $warn_rollback_was_thrown = false;
public static $transaction_rollbacked = false;
public function __construct()
{
parent :: __construct( ... connection info ... );
}
public static $nest = 0;
public function reset()
{
TransactionController :: $transaction_rollbacked = false;
TransactionController :: $warn_rollback_was_thrown = false;
TransactionController :: $nest = 0;
}
function beginTransaction()
{
$result = null;
if (TransactionController :: $nest == 0) {
$this->reset();
$result = parent :: beginTransaction();
}
TransactionController :: $nest++;
return $result;
}
public function commit()
{
$result = null;
if (TransactionController :: $nest == 0 &&
!TransactionController :: $transaction_rollbacked &&
!TransactionController :: $warn_rollback_was_thrown) {
$result = parent :: commit();
}
TransactionController :: $nest--;
return $result;
}
public function rollback()
{
$result = null;
if (TransactionController :: $nest >= 0) {
if (TransactionController :: $nest == 0) {
$result = parent :: rollback();
TransactionController :: $transaction_rollbacked = true;
}
else {
TransactionController :: $warn_rollback_was_thrown = true;
}
}
TransactionController :: $nest--;
return $result;
}
public function transactionFailed()
{
return TransactionController :: $warn_rollback_was_thrown === true;
}
// to force rollback you can only do it from $nest = 0
public function forceRollback()
{
if (TransactionController :: $nest === 0) {
throw new \PDOException();
}
}
}
class CarData extends TransactionController {
public function insertCar()
{
try {
$this->beginTransaction();
... (operations) ...
$this->commit();
}
catch (\PDOException $e) {
$this->rollback();
}
}
}
class PersonData extends TransactionController {
public function insertPerson( $person=null )
{
try {
$this->beginTransaction();
... (operations) ...
$this->commit();
}
catch (\PDOException $e) {
$this->rollback();
}
}
}
class CarOwnerData extends TransactionController {
public function createOwner()
{
try {
$this->beginTransaction();
$car = new CarData();
$car->insertCar();
$person = new PersonData();
$person->insertPerson();
... (operations) ...
$this->commit();
}
catch (\PDOException $e) {
$this->rollback();
}
}
}
$sellCar = new CarOwnerData();
$sellCar->createOwner();
UPDATE1：静态属性$warn_rollback_was_thrown已添加到TransactionController,以警告事务在执行的某个时刻失败,但没有回滚.
UPDATE2：当事务在某个时刻失败时,您可以使用forceRollback()让代码仍然运行到最后或最终停止它,例如,请参见以下代码：
public function insertMultiplePersons( $arrayPersons )
{
try {
$this->beginTransaction();
if (is_array( $arrayPersons )) {
foreach ($arrayPersons as $k => $person) {
$this->insertPerson( $person );
if ($this->transactionFailed()) {
$this->forceRollback();
}
}
}
$this->commit();
}
catch (\PDOException $e) {
$this->rollback();
}
} ?>
