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php使用MySQL保存session会话的方法

Jun 06, 2016 pm 08:03 PM
mysql php session

这篇文章主要介绍了php使用MySQL保存session会话的方法,实例分析了php操作MySQL数据库及session对话的相关技巧,需要的朋友可以参考下

本文实例讲述了php使用MySQL保存session会话的方法。分享给大家供大家参考。具体分析如下:

在很多大的系统中一般都有这个功能,但是要分离出来分析,网上靠谱的资料也不太多 这里我整理了一篇发出来与大家分享

使用MySQL保存session会话较files有很多优点:

1) 有利于分布式系统,files只能保存在一台机器上
2) 有利于大访问量的系统,使用files时每个session保存在一个文件中,目录会超级大,查找session文件会比较困难。

//////使用MySQL保存会话首先要创建session表:

/////////MysqlSession 类如下: DB_NAME = &$sessionDB; $this->SESS_LIFE = get_cfg_var("session.gc_maxlifetime"); session_module_name('user'); session_set_save_handler( array(&$this, 'sess_open'), array(&$this, 'sess_close'), array(&$this, 'sess_read'), array(&$this, 'sess_write'), array(&$this, 'sess_destroy'), array(&$this, 'sess_gc') ); session_start(); } function sess_open($save_path, $session_name){ // 打开数据库连接 if (! $this->DB_SELECT_DB = mysql_pconnect($this->DB_SERVER, $this->DB_USER, $this->DB_PASS)) { echo "SORRY! MYSQL ERROR : Can't connect to $this->DB_SERVER as $DB_USER"; echo "MySQL Error: ", mysql_error(); die; } if (! mysql_select_db($this->DB_NAME, $this->DB_SELECT_DB)) { echo "SORRY! MYSQL ERROR : Unable to select database $this->DB_NAME"; die; } return true; } function sess_close() { return true; } function sess_read($SessionKey){ $Query = "SELECT SessionArray FROM sessions WHERE SessionKey = '".$SessionKey."' AND SessionExpTime > " . time(); // 过期不读取。 $Result = mysql_query($Query, $this->DB_SELECT_DB); if (list($SessionArray) = mysql_fetch_row($Result)) { return $SessionArray; } return false; } function sess_write($SessionKey, $VArray) { $SessionExpTime = time() + $this->SESS_LIFE; // 更新Session过期时间, //Session过期时间 = 最后一次更新时间 + Session的最大使用时长 $SessionArray = addslashes($VArray); $Query = "INSERT INTO sessions (SessionKey,SessionExpTime,SessionArray) VALUES ('".$SessionKey."','".$SessionExpTime."','".$SessionArray."')"; $Result = mysql_query($Query, $this->DB_SELECT_DB); if (!$Result){ $Query = "UPDATE sessions SET SessionExpTime = '".$SessionExpTime."', SessionArray = '".$SessionArray."' WHERE SessionKey = '".$SessionKey."' AND SessionExpTime > " . time(); $Result = mysql_query($Query, $this->DB_SELECT_DB); } return $Result; } function sess_destroy($SessionKey) { $Query = "DELETE FROM sessions WHERE SessionKey = '".$SessionKey."'"; $Result = mysql_query($Query, $this->DB_SELECT_DB); return $Result; } function sess_gc($maxlifetime) { // 这个垃圾清除器系统调用。 //默认是1440秒清除一次。参数可以在PHP.ini里面设置。 $Query = "DELETE FROM sessions WHERE SessionExpTime DB_SELECT_DB); return mysql_affected_rows($this->DB_SELECT_DB); } } ?> //用法:在原来使用 session_start 的地方,替换成 $session = new MysqlSession () //注意:包含此程序前要打开数据库,主程序退出前不能关闭数据库,,否则会出错。

希望本文所述对大家的php程序设计有所帮助。

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