120 lines
2.8 KiB
PHP
120 lines
2.8 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2010-2021, the Friendica project
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Test\Util\Database;
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use PDO;
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use PDOException;
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/**
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* This class extends native PDO one but allow nested transactions
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* by using the SQL statements `SAVEPOINT', 'RELEASE SAVEPOINT' AND 'ROLLBACK SAVEPOINT'
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*/
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class ExtendedPDO extends PDO
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{
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/**
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* @var array Database drivers that support SAVEPOINT * statements.
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*/
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protected static $_supportedDrivers = ["pgsql", "mysql"];
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/**
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* @var int the current transaction depth
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*/
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protected $_transactionDepth = 0;
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/**
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* @return int
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*/
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public function getTransactionDepth()
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{
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return $this->_transactionDepth;
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}
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/**
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* Test if database driver support savepoints
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*
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* @return bool
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*/
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protected function hasSavepoint()
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{
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return in_array($this->getAttribute(PDO::ATTR_DRIVER_NAME),
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self::$_supportedDrivers);
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}
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/**
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* Start transaction
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*
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* @return bool|void
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*/
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public function beginTransaction()
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{
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if($this->_transactionDepth <= 0 || !$this->hasSavepoint()) {
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parent::beginTransaction();
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$this->_transactionDepth = 0;
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} else {
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$this->exec("SAVEPOINT LEVEL{$this->_transactionDepth}");
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}
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$this->_transactionDepth++;
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}
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/**
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* Commit current transaction
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*
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* @return bool|void
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*/
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public function commit()
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{
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// We don't want to "really" commit something, so skip the most outer hierarchy
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if ($this->_transactionDepth <= 1 && $this->hasSavepoint()) {
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$this->_transactionDepth = $this->_transactionDepth <= 0 ? 0 : 1;
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return true;
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}
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$this->_transactionDepth--;
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$this->exec("RELEASE SAVEPOINT LEVEL{$this->_transactionDepth}");
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}
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/**
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* Rollback current transaction,
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*
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* @throws PDOException if there is no transaction started
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* @return bool|void
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*/
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public function rollBack()
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{
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$this->_transactionDepth--;
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if($this->_transactionDepth <= 0 || !$this->hasSavepoint()) {
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$this->_transactionDepth = 0;
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try {
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parent::rollBack();
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} catch (PDOException $e) {
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// this shouldn't happen, but it does ...
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}
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} else {
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$this->exec("ROLLBACK TO SAVEPOINT LEVEL{$this->_transactionDepth}");
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}
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}
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}
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