Reconnecting on MySQL Server Has Gone Away(在 MySQL 服务器上重新连接已经消失)
本文介绍了在 MySQL 服务器上重新连接已经消失的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何修改此类以捕获 MySQL 服务器离开的异常并重新连接?
How can I modify this class to catch exception where MySQL Server Goes Away, and reconnect?
<?php
class DBConn
{
private $conn;
public function __construct( $persistent = false )
{
try
{
$this->conn = new PDO( "mysql:host=localhost;dbname=test", 'test', "hoollaahaoo" );
$this->conn->exec( "SET CHARACTER SET utf8" );
$this->conn->setAttribute( PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC );
if ( $persistent )
$this->conn->setAttribute( PDO::ATTR_PERSISTENT, true );
}
catch( PDOException $e )
{
return $e->getMessage();
}
}
public function getConn()
{
return $this->conn;
}
}
推荐答案
你可能需要像这样创建自己的类
you probably will need to make your own class like this one
- 从
__construct
中删除 - 然后像这样连接到你的数据库:
try/except
$conn = null;
$limit = 10;
$counter = 0;
while (true) {
try {
$conn = DBConn();
break;
}
catch (Exception $e) {
$conn = null;
$counter++;
if ($counter == $limit)
throw $e;
}
}
编辑 1:
但是如果你说你的服务器消失了......那么可能是这样的
but if you say that your server goes away.... then may be smth like this
protected function _connect( $persistent = false ) {
$conn = null;
$limit = 10;
$counter = 0;
while (true) {
try {
$this->conn = new PDO( "mysql:host=localhost;dbname=test", 'test', "hoollaahaoo" );
$this->conn->exec( "SET CHARACTER SET utf8" );
$this->conn->setAttribute( PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC );
if ( $persistent )
$this->conn->setAttribute( PDO::ATTR_PERSISTENT, true );
}
catch (Exception $e) {
$conn = null;
$counter++;
if ($counter == $limit)
throw $e;
}
}
public function __construct( $persistent = false )
{
$this->_connect($persistent);
}
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本文标题为:在 MySQL 服务器上重新连接已经消失


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