使用 PDO 设置连接超时

2021-12-26 00:00:00 postgresql php mysql pdo

我正在使用 PDO 从 MySQL 服务器获取数据.我注意到的是:如果 MySQL 服务器不可用，这段代码需要真的(相对)很长时间才能返回异常:

I'm using PDO to get data off a MySQL server. What I noticed is this: if the MySQL server is unavailable, it takes really (relatively) long for this code to return an exception:

try {
  $handle = new PDO($db_type . ':host='.$db_host.';dbname='.$db_name,$db_user,$db_pass);
  // Tried using PDO::setAttribute and PDO::ATTR_TIMEOUT here
} catch(PDOException $e) {
  echo $e->getMessage;
}

在 MySQL 的情况下，异常发生只需要 2 分钟多一点(SQLSTATE[HY000] [2003] Can't connect to MySQL server on...)和 30 秒在 PostgreSQL (SQLSTATE[08006] [7] 超时已过期).

In case of MySQL it takes just over 2 minutes for the exception to occur (SQLSTATE[HY000] [2003] Can't connect to MySQL server on...) and 30 seconds on PostgreSQL (SQLSTATE[08006] [7] timeout expired).

我尝试使用 PDO::setAttribute 和 PDO::ATTR_TIMEOUT 但它不起作用.我想这是有道理的，因为问题发生在此语句之前.

I tried using PDO::setAttribute and PDO::ATTR_TIMEOUT but it's not working. Which I guess makes sense, since the problem occurs before this statement.

有没有办法设置连接数据库的超时时间?2 分钟/30 秒对我来说似乎很长，让 PDO 意识到那里什么都没有.

Is there a way to set a timeout for connecting to the DB? 2 minutes/30 seconds seems really long to me for PDO to realize there is nothing there.

我想我在某处看到过这种情况，但我一辈子都找不到了.

I think I saw this being done somewhere, but can't find it again for the life of me.

推荐答案

$DBH = new PDO(
    "mysql:host=$host;dbname=$dbname", 
    $username, 
    $password,
    array(
        PDO::ATTR_TIMEOUT => 5, // in seconds
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
    )
);

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