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PHP: mysql_ping - auto reconnect problem
原标题:

I m working with an old but very complex piece of php code, which relies on direct mysql access via mysql_* functions. The code uses mysql_ping extensively, but it assumes each mysql_ping call will also reconnect in case it finds out connection timed out. The problem is that since MySQL 5.0.something mysql_ping doesn t reconnect automatically. In the doc s I found I need to call mysql_options with appropriate flag, but there s no such function as mysql_options. Instead, there s mysqli_options but we literally can t switch to mysqli_* now, it d take way too much time. Downgrading MySQL is also not considered as a solution. Any ideas how to fix that?

Thanks

最佳回答

Upon checking the php manual i found this piece of code that may help you handle the db connection status:

<?php

$conn = mysql_connect( localhost , user , pass );
mysql_select_db( db ,$conn);

if (!mysql_ping ($conn)) {
//here is the major trick, you have to close the connection (even though its not currently working) for it to recreate properly.
   mysql_close($conn);
   $conn = mysql_connect( localhost , user , pass );
   mysql_select_db( db ,$conn);
}

//run queries knowing that your connection is alive....

?>
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