/**
* Snapshot isolation is not compatible with DDL operations.
*
* @return TransactionSettings
*/
public static function GetDDLCompatibleDefaults() {
return new TransactionSettings(TRUE,
DatabaseTransactionScopeOption::Required(),
DatabaseTransactionIsolationLevel::ReadCommitted());
}
/**
* Internal function: commit all the transaction layers that can commit.
*/
protected function popCommittableTransactions() {
// Commit all the committable layers.
foreach (array_reverse($this->transactionLayers) as $name => $state) {
// Stop once we found an active transaction.
if ($state['active']) {
break;
}
// If there are no more layers left then we should commit.
unset($this->transactionLayers[$name]);
if (empty($this->transactionLayers)) {
try {
// PDO::commit() can either return FALSE or throw an exception itself
if (!$this->connection->commit()) {
throw new DatabaseTransactionCommitFailedException();
}
}
finally {
// Restore original transaction isolation level
if ($level = static::DefaultTransactionIsolationLevelInStatement()) {
if($state['settings']->Get_IsolationLevel() != DatabaseTransactionIsolationLevel::Ignore()) {
if ($level != $state['settings']->Get_IsolationLevel()->__toString()) {
$this->query_direct("SET TRANSACTION ISOLATION LEVEL {$level}");
}
}
}
}
}
else {
// Savepoints cannot be commited, only rolled back.
}
}
}