doctrine实现自动重连mysql数据库机制

这篇文章主要介绍了doctrine实现自动重连mysql数据库机制,小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧

不知道大家有没有碰到就是mysql有的时候会八小时不使用的话自动断开连接，这样会导致我们的请求失败，项目访问报错，数据库断开，这个时间要是失效了，那我们该怎么办呢？我们使用的是doctrine-dbal，所以那我们就写一套自动重连的机制吧！话不多bb，直接上代码。 <br>

<?php
namespace WsdServer\Lib\PDO;

use Doctrine\Common\EventManager;

use Doctrine\DBAL\Driver;
use Doctrine\DBAL\Configuration;
use Doctrine\DBAL\DBALException;
use Doctrine\DBAL\Cache\QueryCacheProfile;

use Doctrine\DBAL\Connection AS Connection;


/**
 * A wrapper around a Doctrine\DBAL\Connection that adds features like
 * reconnect
 *
 */
 class WsdConnection extends Connection
 {
    const RECONNECT_MAX_TIMES = 3;  // 最多重试次数

    private $reconnectRetryTimes;    
    
    public function __construct(array $params, Driver $driver, Configuration $config = null,
                                EventManager $eventManager = null)
    {
        parent::__construct($params, $driver, $config, $eventManager);
    }    
    
    /**
     * executeQuery - 支持自动重连机制的封装
     *
     * Executes an, optionally parametrized, SQL query.
     *
     * If the query is parametrized, a prepared statement is used.
     * If an SQLLogger is configured, the execution is logged.
     *
     * @param string $query The SQL query to execute.
     * @param array $params The parameters to bind to the query, if any.
     * @param array $types The types the previous parameters are in.
     * @param \Doctrine\DBAL\Cache\QueryCacheProfile|null $qcp The query cache profile, optional.
     *
     * @return \Doctrine\DBAL\Driver\Statement The executed statement.
     *
     * @throws DBALException
     * @throws \Exception
     */
    public function executeQuery($query, array $params = array(), $types = array(), QueryCacheProfile $qcp = null)
    {
        try {            
             $result = parent::executeQuery($query, $params, $types, $qcp);            
             $this->reconnectRetryTimes = 0;            
             return $result;
        } catch (DBALException $dex){         
            if ( $dex->getErrorCode() == 2006 ) {            
                if ($this->reconnectRetryTimes <= WsdConnection::RECONNECT_MAX_TIMES) {             
                    $this->reconnectRetryTimes++;
                    secho("ORM-executeQuery", "MySQL Reconnect...("
                        . $this->reconnectRetryTimes . "/" . WsdConnection::RECONNECT_MAX_TIMES . ")");                   
                    $this->close();                    
                    return $this->executeQuery($query, $params, $types, $qcp);
                }
            }            
              throw $dex;
        } catch (\Exception $ex) {        
              throw $ex;
        }
    }    
    
    
    /**
     * executeUpdate - 支持自动重连机制的封装
     *
     * Executes an SQL INSERT/UPDATE/DELETE query with the given parameters
     * and returns the number of affected rows.
     *
     * This method supports PDO binding types as well as DBAL mapping types.
     *
     * @param string $query The SQL query.
     * @param array $params The query parameters.
     * @param array $types The parameter types.
     *
     * @return integer The number of affected rows.
     *
     * @throws DBALException
     * @throws \Exception
     */
    public function executeUpdate($query, array $params = array(), array $types = array())
    {
        try {       
             $result = parent::executeUpdate($query, $params, $types);            
             $this->reconnectRetryTimes = 0;            
             return $result;
        } catch (DBALException $dex){        
            if ( $dex->getErrorCode() == 2006 ) {            
                $this->reconnectRetryTimes++;                
                if ($this->reconnectRetryTimes <= WsdConnection::RECONNECT_MAX_TIMES) {
                    secho("ORM-executeQuery", "MySQL Reconnect...("
                        . $this->reconnectRetryTimes . "/" . WsdConnection::RECONNECT_MAX_TIMES . ")");                    
                    $this->close();                    
                    parent::executeUpdate($query, $params, $types);
                }
            }     
               throw $dex;
        } catch (\Exception $ex) {         
               throw $ex;
        }
    }

}

这样用现在的两个方法覆盖了它原来本身的，这样从连机制简简单单的好了，
测试了一波，发现我们 kill mysql，在重新起来的时候他会自动重新连接，原因是它本身的底层有一个，$this->connect()。所以我们不用怕了

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