<?php namespace Friendica\Test\Util\Database; use PDO; use PDOException; /** * This class extends native PDO one but allow nested transactions * by using the SQL statements `SAVEPOINT', 'RELEASE SAVEPOINT' AND 'ROLLBACK SAVEPOINT' */ class ExtendedPDO extends PDO { /** * @var array Database drivers that support SAVEPOINT * statements. */ protected static $_supportedDrivers = array("pgsql", "mysql"); /** * @var int the current transaction depth */ protected $_transactionDepth = 0; /** * @return int */ public function getTransactionDepth() { return $this->_transactionDepth; } /** * Test if database driver support savepoints * * @return bool */ protected function hasSavepoint() { return in_array($this->getAttribute(PDO::ATTR_DRIVER_NAME), self::$_supportedDrivers); } /** * Start transaction * * @return bool|void */ public function beginTransaction() { if($this->_transactionDepth == 0 || !$this->hasSavepoint()) { parent::beginTransaction(); } else { $this->exec("SAVEPOINT LEVEL{$this->_transactionDepth}"); } $this->_transactionDepth++; } /** * Commit current transaction * * @return bool|void */ public function commit() { $this->_transactionDepth--; if($this->_transactionDepth == 0 || !$this->hasSavepoint()) { parent::commit(); } else { $this->exec("RELEASE SAVEPOINT LEVEL{$this->_transactionDepth}"); } } /** * Rollback current transaction, * * @throws PDOException if there is no transaction started * @return bool|void */ public function rollBack() { if ($this->_transactionDepth == 0) { throw new PDOException('Rollback error : There is no transaction started'); } $this->_transactionDepth--; if($this->_transactionDepth == 0 || !$this->hasSavepoint()) { parent::rollBack(); } else { $this->exec("ROLLBACK TO SAVEPOINT LEVEL{$this->_transactionDepth}"); } } }