gistfile1.txt

<?php
namespace DDB;

class MySQLi {
    private $link;

    public function __construct($hostname, $username, $password, $database, $port = '3306') {
        mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
        $this->link = new \mysqli($hostname, $username, $password, $database, $port);

        if ($this->link->connect_error) {
            throw new \Exception('Error: Could not make a database link (' . $this->link->connect_errno . ') ' . $this->link->connect_error);
        }

        $this->link->set_charset("utf8");
        $this->link->query("SET SQL_MODE = ''");
    }

    public function query($sql) {
        try {
            $query = $this->link->query($sql);

            if ($query instanceof \mysqli_result) {
                $data = array();

                while ($row = $query->fetch_assoc()) {
                    $data[] = $row;
                }

                $result = new \stdClass();
                $result->num_rows = $query->num_rows;
                $result->row = isset($data[0]) ? $data[0] : array();
                $result->rows = $data;

                $query->close();

                return $result;
            } else {
                return true;
            }
        } catch (\mysqli_sql_exception $e) {
            throw new \Exception('Error: ' . $e->getMessage() . '<br />Error No: ' . $e->getCode() . '<br />' . $sql);
        }
    }

    public function escape($value) {
        return $this->link->real_escape_string($value);
    }

    public function countAffected() {
        return $this->link->affected_rows;
    }

    public function getLastId() {
        return $this->link->insert_id;
    }

    public function __destruct() {
        $this->link->close();
    }
}

class TransactionWrapper {
    private $db;
    private $registry;
    private $originalAutocommit;

    public function __construct($registry, $hostname, $username, $password, $database, $port = '3306') {
        $this->db = new MySQLi($hostname, $username, $password, $database, $port);
        $this->registry = $registry;
    }

    public function start() {
        $this->originalAutocommit = $this->db->query("SELECT @@autocommit")->row['@@autocommit'];
        $this->db->query("SET autocommit=0");
        $this->db->query("START TRANSACTION");
    }

    public function commit() {
        $this->db->query("COMMIT");
        $this->db->query("SET autocommit=" . $this->originalAutocommit);
    }

    public function rollback() {
        $this->db->query("ROLLBACK");
        $this->db->query("SET autocommit=" . $this->originalAutocommit);
    }

    public function query($sql) {
        return $this->db->query($sql);
    }

    public function escape($value) {
        return $this->db->escape($value);
    }

    public function countAffected() {
        return $this->db->countAffected();
    }

    public function getLastId() {
        return $this->db->getLastId();
    }

    public function execute($callback) {
        $this->start();
        try {
            $result = $callback($this);
            $this->commit();
            return $result;
        } catch (\Exception $e) {
            $this->rollback();
            $this->logError($e->getMessage());
            return false;
        }
    }

    private function logError($message) {
        $log = $this->registry->get('log');
        $log->write('Transaction error: ' . $message);
    }
}