使用PDO设置连接超时 [英] Setting a connect timeout with PDO

问题描述

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，则此代码返回异常的时间为 really (相对)很长:

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;
}

对于MySQL，发生异常(SQLSTATE [HY000] [2003]无法连接到...上的MySQL服务器)仅需2分钟以上，而在PostgreSQL(SQLSTATE [08006] [7]上则需要30秒]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，但是它不起作用.我猜这是有道理的，因为问题出在此声明之前.

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.

是否可以设置连接数据库的超时时间?对于PDO来说，2分钟30秒对我来说真的很长，要意识到那里什么也没有.

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.

我认为我在某处看到了这一点，但是在我的一生中再也找不到了.

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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