php session存数据库

素颜马尾好姑娘i 2022-08-01 11:27 200阅读 0赞

这个sesison存到数据库很简单，就是根据session\_id进行对数据库的CRUD操作，主要是用到了，session\_set\_save\_handler这个方法，自定义session的执行方法，

首先创建数据表

CREATE TABLE `sessions` (
      `session_id` varchar(255) NOT NULL,
      `session_expires` int(11) DEFAULT NULL,
      `session_data` text,
      PRIMARY KEY (`session_id`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8
    然后封装操作session的工具类：
     <?php
    //error_reporting(0);
    class session {
      
       var $lifeTime;
      
       var $dbHandle;
       function open($savePath, $sessName) {
           
           $this->lifeTime = get_cfg_var("session.gc_maxlifetime");
           
           $dbHandle = mysql_connect("localhost","root","root");
           $dbSel = mysql_select_db("mysession",$dbHandle);
           
           if(!$dbHandle || !$dbSel)
               return false;
           $this->dbHandle = $dbHandle;
           return true;
       }
       function close() {
           $this->gc(ini_get('session.gc_maxlifetime'));
          
           return @mysql_close($this->dbHandle);
       }
       function read($sessID) {
           
           $res = mysql_query("SELECT session_data AS d FROM sessions
                               WHERE session_id = '$sessID'
                               AND session_expires > ".time(),$this->dbHandle);
           
           if($row = mysql_fetch_assoc($res))
               return $row['d'];
           return "";
       }
       function write($sessID,$sessData) {
    	   
    	
           
           $newExp = time() + $this->lifeTime;
           
           $res = mysql_query("SELECT * FROM sessions
                               WHERE session_id = '$sessID'",$this->dbHandle);
          
    	   
           if($res) {
              
    		   
               mysql_query("UPDATE sessions SET session_expires = '{$newExp}',session_data = '{$sessData}' WHERE session_id = '{$sessID}'",$this->dbHandle);
    				
               
               if(mysql_affected_rows($this->dbHandle))
                   return true;
           }
           
           else {
             
               mysql_query("INSERT INTO sessions (
                             session_id,
                             session_expires,
                             session_data)
                             VALUES(
                             '{$sessID}',
    						 '{$newExp}',
    						 '{$sessData}')",$this->dbHandle);
               
               if(mysql_affected_rows($this->dbHandle))
                   return true;
           }
           
           return false;
       }
       function destroy($sessID) {
           
           mysql_query("DELETE FROM sessions WHERE session_id = '$sessID'",$this->dbHandle);
          
           if(mysql_affected_rows($this->dbHandle))
               return true;
           
           return false;
       }
       function gc($sessMaxLifeTime) {
           
           mysql_query("DELETE FROM sessions WHERE session_expires < ".time(),$this->dbHandle);
           
           return mysql_affected_rows($this->dbHandle);
       }
    }
    #对session进行测试，发现数据库中并没有存入数据只有session_id,和session_expires的数值,其实session_data是存在的只是我们看不到
     $session = new session();
    	session_set_save_handler(array(&$session,"open"),
    							 array(&$session,"close"),
    							 array(&$session,"read"),
    							 array(&$session,"write"),
    							 array(&$session,"destroy"),
    							 array(&$session,"gc"));
    			session_start();
    			$session->write(session_id(),json_encode(array("name"=>"gxx","pass"=>"123")));	
    			echo $session->read(session_id());
    ?>  
    这里居然不支持插图。。
    数据库数据:
    
    s430j9t480ocbovq6a7a0rlk22    1435054078    
    
    session查询数据:
    
     
      
      
       JSON
     
      
     
      
       name"gxx" 
       pass"123" 
      不要被事物蒙蔽了眼睛。。。。