Question

我在PHP数据库连接方面遇到了一些疑问。因为我不能在我的方法（Java风格）上放置一个大的try / catch / finally块，当大小/逻辑趋于增加时，正确关闭所有连接和预处理语句的最佳方法是什么？考虑到下一个方法，一切都做得对吗？

public function createRegister($register) {
        $this->openConnection();

        $query = "INSERT INTO register (username, password, email, confirmationToken) VALUES (?, ?, ?, ?)";
        $result = $this->mysqli->query($query);

        if ($statement = $this->mysqli->prepare($query)) {  
            $statement->bind_param("ssss", $register->username, $register->passwordHash, $register->email, $register->confirmationToken);

            if (!$statement->execute()) {
                $this->closeConnection();
                throw new DAOException("Failed to execute statement: " . $statement->error);
            }

            $statement->close();

        } else {
            $this->closeConnection();
            throw new DAOException("Failed to prepare statement: " . $this->mysqli->error);
        }

        $this->closeConnection();
    }

Answer 1

你仍然可以在PHP中使用try / catch：

public function createRegister($register) {

    $this->openConnection();

    $query = "INSERT INTO register (username, password, email, confirmationToken) VALUES (?, ?, ?, ?)";

    try {

        // This line is not needed
        // $result = $this->mysqli->query($query);

        if ($statement = $this->mysqli->prepare($query)) {

            $statement->bind_param("ssss", $register->username, $register->passwordHash, $register->email, $register->confirmationToken);

            if (!$statement->execute()) {                   
                throw new DAOException("Failed to execute statement: " . $statement->error);
            }

            $statement->close();

        } else {
            throw new DAOException("Failed to prepare statement: " . $this->mysqli->error);
        }
    } catch (Exception $e) {

        if ((isset($statement)) && (is_callable(array($statement, 'close')))) {
            $statment->close();
        }

        $this->closeConnection();

        throw $e;
    }

    $this->closeConnection();
}

这适用于为一个特定任务建立连接，但是如果要为多个也需要访问同一模式的任务共享相同的连接，该怎么办？您可能需要考虑使用单例/工厂模式创建和访问数据库连接的更高级解决方案。我发布了这样一个example作为另一个问题的解决方案。它有点先进，但一旦你了解它，它就会更高效。

正确关闭PHP中的数据库连接

1 个答案: