class.session.php

php postgre sql session 类

<?php
 /*
文件名：session类
日期：10:00 2005-11-30 
*/

/* Create new object of class */ 
$ses_class = new session(); 
/* Change the save_handler to use the class functions */ 
session_set_save_handler(array(&$ses_class, '_open'), 
                         array(&$ses_class, '_close'), 
                         array(&$ses_class, '_read'), 
                         array(&$ses_class, '_write'), 
                         array(&$ses_class, '_destroy'), 
                         array(&$ses_class, '_gc')); 

/* Start the session */ 
session_start(); 
if (!DEFINED("SESSION_LIFETIME")) DEFINE("SESSION_LIFETIME",10);
class session 
{ 
   /* Define the postgre table you wish to use with 
       this class, this table MUST exist. */ 
   var $ses_table = "sessions";//sessions表 
   var $db;//初始化数据库类
   var $debug=DEBUG;//出错信息显示,用于排错
	function session(){
		$this->db =sysdb::GetConnection();
	}
   /* Open session, if you have your own db connection 
       code, put it in here! */ 
   function _open($path, $name) {
		return true;
   } 
   /* Close session */ 
   function _close() { 
   	return true;
   } 

   /* Read session data from database */ 
   function _read($ses_id) { 
		$ret= $this->db->getFirst("SELECT data FROM ".$this->ses_table." WHERE id='$ses_id';");
		return $ret['data'];
   } 

   /* Write new data to database */ 
   function _write($ses_id, $data) {
	$data=addslashes($data);
	$rt=$this->db->getFirst("SELECT data FROM ".$this->ses_table." WHERE id='$ses_id';");
		$uid=getuid();

	if($rt!=''){
			$idata=array(
			'data'=>$data,
			'uid'=>$uid,
			"time"=>time());
			if($this->db->update($this->ses_table,$idata," id='$ses_id'")&& $this->debug){
				$this->db->seterror("写入错误update");
			}
	}
	else{
		$idata=array('id'=>$ses_id,
				'data'=>$data,"time"=>time(),'uid'=>$uid);
		$this->db->query("delete from ".$this->ses_table." where uid=$uid;");
		if(!$this->db->insert($this->ses_table,$idata)&&$this->debug)
				$this->db->seterror("写入错误insert!");
	
	}
	return true;
   } 

   /* Garbage collection, deletes old sessions */ 
   function _gc($life) { 
			$tm=time()- $life;
   		  	if(!$this->db->delete($this->ses_table,"time < $tm")&&$this->debug)
			$this->db->seterror("错误 delete");
	return true;
   }
   /*注销销毁session*/
   function _destroy($ses_id){
	   //echo "destroy";
	   //echo $ses_id;
	 	if(!$this->db->delete($this->ses_table,"id='$ses_id'")&&$this->debug)
		$this->db->seterror("错误 delete");
	return true;
   }
} 
?>