设置PDO连接超时时间小于1秒 [英] Setting PDO connection timeout time less than 1 second
问题描述
我正在使用PHP和PDO对象连接到mysql.我的php代码可以连接到3个数据库服务器.如果我尝试连接到数据库服务器#1并且连接失败，我想立即尝试连接到数据库服务器#2.使用以下代码，我可以设置的连接超时时间最低为1秒.
I'm using PHP and a PDO object to connect to mysql. I have 3 DB servers that my php code can connect to. If I try to connect to DB server #1 and the connection fails I would like to immediately try to connect to DB server #2. The lowest I can set the connection timeout time is 1 second with the code below.
$DBH = new PDO("mysql:host=$host;dbname=$dbname", $username, $password,array(PDO::ATTR_TIMEOUT => "1",PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));
$DBH = new PDO("mysql:host=$host;dbname=$dbname", $username, $password,array(PDO::ATTR_TIMEOUT => "1",PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));
理想情况下，我想将超时时间设置为< 50毫秒.如果可能，则为0ms.有什么办法吗?
Ideally I'd like to set the timeout time to <50 milliseconds. Or 0ms if possible. Is there any way to do this?
推荐答案
这是不可能的，因为底层的MySQL驱动程序不允许:
This is not possible because the underlying MySQL driver won't allow it:
Request #60716: Ability to set PDO connection timeout in milliseconds
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