php如何将mysql数据库中的admin字段赋值给session_php实现将Session写入数据库
/*
*@author Fahy
*數據庫為mysql，
*數據庫名為session，表名為session，
*表中字段包括PHPSESSID,update_time,client_ip,data
*/
class Session{
private static $handler = null;
private static $ip = null;
private static $lifetime = null;
private static $time = null;
//配置靜態變量
private static function init($handler){
self::$handler = $handler; //獲取數據庫資源
self::$ip = !empty($_SERVER["REMOTE_ADDR"])? $_SERVER["REMOTE_ADDR"]:'unkonw'; //獲取客戶端ip
self::$lifetime = ini_get('session.gc_maxlifetime'); //獲取session生命周期
self::$time = time(); //獲取當前時間
}
//調用session_set_save_handler()函數并開啟session
static function start($pdo){
self::init($pdo);
session_set_save_handler(
array(__CLASS__,'open'),
array(__CLASS__,'close'),
array(__CLASS__,'read'),
array(__CLASS__,'write'),
array(__CLASS__,'destroy'),
array(__CLASS__,'gc')
);
session_start();
}
public static function open($path,$name){
return true;
}
public static function close(){
return true;
}
//查詢數據庫中的數據
public static function read($PHPSESSID){
$sql = "select PHPSESSID,update_time,client_ip,data from session where PHPSESSID=?";
$stmt = self::$handler->prepare($sql);
$stmt->execute(array($PHPSESSID));
if(!$result = $stmt->fetch(PDO::FETCH_ASSOC)){
return '';
}
if(self::$ip == $result['client_ip']){
self::destroy($PHPSESSID);
return '';
}
if(($result['update_time']+self::$lifetime)<:>
self::destroy($PHPSESSID);
return '';
}
return $result['data'];
}
/*
*首先查詢該session是否存在數據，如果存在，則更新數據，如果不存在，則插入數據
*/
//將session寫入數據庫中，$data傳入session中的keys和values數組
public static function write($PHPSESSID,$data){
$sql = "select PHPSESSID,update_time,client_ip,data from session where PHPSESSID=?";
$stmt = self::$handler->prepare($sql);
$stmt->execute(array($PHPSESSID));
if($result=$stmt->fetch(PDO::FETCH_ASSOC)){
if($result['data'] != $data || self::$time > ($result['update_time']+30)){
$sql = "update session set update_time=?,data=? where PHPSESSID = ?";
$stmt = self::$handler->prepare($sql);
$stmt->execute(array($self::$time,$data,$PHPSESSID));
}
}else{
if(!empty($data)){
try{
$sql = "insert into session(PHPSESSID,update_time,client_ip,data) values(?,?,?,?)";
}catch(PDOException $e){
echo $e->getMessage();
}
$sth = self::$handler->prepare($sql);
$sth->execute(array($PHPSESSID,self::$time,self::$ip,$data));
}
}
return true;
}
public static function destroy($PHPSESSID){
$sql = "delete from session where PHPSESSID = ?";
$stmt = self::$handler->prepare($sql);
$stmt->execute(array($PHPSESSID));
return true;
}
public static function gc($lifetime){
$sql = "delete from session where update_time";
$stmt = self::$handler->prepare($sql);
$stmt->execute(array(self::$time-$lifetime));
return true;
}
}
//使用PDO連接數據庫
try{
$pdo = new PDO("mysql:host=localhost;dbname=session","root","hwj193");
}catch(PDOException $e){
echo $e->getMessage();
}
//傳遞數據庫資源
Session::start($pdo);
總結
以上是生活随笔為你收集整理的php如何将mysql数据库中的admin字段赋值给session_php实现将Session写入数据库的全部內容，希望文章能夠幫你解決所遇到的問題。
- 上一篇： java递归生成无限层级的树--分类管理
- 下一篇： mysql获取后一天_mysql获取当前