問題描述

如何修改此類以捕獲 MySQL 服務器離開的異常并重新連接?

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;
}
}

推薦答案

你可能需要像這樣創建自己的類

you probably will need to make your own class like this one

1. 從__construct
中刪除try/except
2. 然后像這樣連接到你的數據庫:

$conn = null;
$limit = 10;
$counter = 0;
while (true) {
  try {
    $conn = DBConn();
    break;
  }
  catch (Exception $e) {
    $conn = null;
    $counter++;
    if ($counter == $limit)
      throw $e;
  }

}

編輯 1:

但是如果你說你的服務器消失了......那么可能是這樣的

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);
}

這篇關于在 MySQL 服務器上重新連接已經消失的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！