我如何 ping MySQL 数据库并使用 PDO 重新连接

问题描述

我使用 MySQL PDO 来处理数据库查询等.但大多数时候，MySQL 连接消失了.所以我正在查看 PDO，它将检查数据库连接是否存在，如果它不退出，那么我需要连接数据库以继续查询执行.

I am using MySQL PDO for handling database querying and all. But most of the time, the MySQL connection is gone away. So i am looking in the PDO that will check if the db connection is exists or not and if it is not exit, then i need to connect the database to continue the query execution.

我是 MySQL pdo 的新手，我不知道如何处理这种情况.如果有人对此提出建议会更好.

I am new to the MySQL pdo and i do not know how to handling this situation. It would be better if anybody suggest on this.

推荐答案

我试图为同样的问题寻找解决方案，但我找到了下一个答案:

I tried to find a solution for the same problem and I found the next answer:

class NPDO {
    private $pdo;
    private $params;

    public function __construct() {
        $this->params = func_get_args();
        $this->init();
    }

    public function __call($name, array $args) {
        return call_user_func_array(array($this->pdo, $name), $args);
    }

    // The ping() will try to reconnect once if connection lost.
    public function ping() {
        try {
            $this->pdo->query('SELECT 1');
        } catch (PDOException $e) {
            $this->init();            // Don't catch exception here, so that re-connect fail will throw exception
        }

        return true;
    }

    private function init() {
        $class = new ReflectionClass('PDO');
        $this->pdo = $class->newInstanceArgs($this->params);
    }
}

完整故事在这里:https://terenceyim.wordpress.com/2009/01/09/adding-ping-function-to-pdo/

其他人想使用 PDO::ATTR_CONNECTION_STATUS，但他发现:$db->getAttribute(PDO::ATTR_CONNECTION_STATUS) 即使在停止 mysqld 之后，仍然继续回复Localhost via UNIX socket".

Somebody else was thinking to use PDO::ATTR_CONNECTION_STATUS, but he figured out that: "$db->getAttribute(PDO::ATTR_CONNECTION_STATUS) keeps replying "Localhost via UNIX socket" even after stopping mysqld".

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