SESSION is stored in database usage instance, session storage instance_PHP tutorial

SESSION is stored in the database usage example, session storage example

The example in this article describes the usage of SESSION stored in the database. Share it with everyone for your reference. The details are as follows:

<&#63;php
/*
CREATE TABLE `ws_sessions` (
 `session_id` varchar(255) binary NOT NULL default '',
 `session_expires` int(10) unsigned NOT NULL default '0',
 `session_data` text,
 PRIMARY KEY (`session_id`)
) TYPE=InnoDB;
*/
class session {
 // session-lifetime
 var $lifeTime;
 // mysql-handle
 var $dbHandle;
 function open($savePath, $sessName) {
 // get session-lifetime
 $this->lifeTime = get_cfg_var("session.gc_maxlifetime");
 // open database-connection
 $dbHandle = @mysql_connect("localhost","root","");
 $dbSel = @mysql_select_db("test",$dbHandle);
 // return success
 if(!$dbHandle || !$dbSel)
  return false;
 $this->dbHandle = $dbHandle;
 return true;
 }
 function close() {
 $this->gc(ini_get('session.gc_maxlifetime'));
 // close database-connection
 return @mysql_close($this->dbHandle);
 }
 function read($sessID) {
 // fetch session-data
 $res = mysql_query("SELECT session_data AS d FROM ws_sessions
    WHERE session_id = '$sessID'
    AND session_expires > ".time(),$this->dbHandle);
 // return data or an empty string at failure
 if($row = mysql_fetch_assoc($res))
  return $row['d'];
 return "";
 }
 function write($sessID,$sessData) {
 // new session-expire-time
 $newExp = time() + $this->lifeTime;
 // is a session with this id in the database&#63;
 $res = mysql_query("SELECT * FROM ws_sessions
    WHERE session_id = '$sessID'",$this->dbHandle);
 // if yes,
 if(mysql_num_rows($res)) {
  // ...update session-data
  mysql_query("UPDATE ws_sessions
    SET session_expires = '$newExp',
    session_data = '$sessData'
    WHERE session_id = '$sessID'",$this->dbHandle);
  // if something happened, return true
  if(mysql_affected_rows($this->dbHandle))
  return true;
 }
 // if no session-data was found,
 else {
  // create a new row
  mysql_query("INSERT INTO ws_sessions (
    session_id,
    session_expires,
    session_data)
    VALUES(
    '$sessID',
    '$newExp',
    '$sessData')",$this->dbHandle);
  // if row was created, return true
  if(mysql_affected_rows($this->dbHandle))
  return true;
 }
 // an unknown error occured
 return false;
 }
 function destroy($sessID) {
 // delete session-data
 mysql_query("DELETE FROM ws_sessions WHERE session_id = '$sessID'",$this->dbHandle);
 // if session was deleted, return true,
 if(mysql_affected_rows($this->dbHandle))
  return true;
 // ...else return false
 return false;
 }
 function gc($sessMaxLifeTime) {
 // delete old sessions
 mysql_query("DELETE FROM ws_sessions WHERE session_expires < ".time(),$this->dbHandle);
 // return affected rows
 return mysql_affected_rows($this->dbHandle);
 }
}
$session = new session();
session_set_save_handler(array(&$session,"open"),
    array(&$session,"close"),
    array(&$session,"read"),
    array(&$session,"write"),
    array(&$session,"destroy"),
    array(&$session,"gc"));
session_start();
// etc...
&#63;>

I hope this article will be helpful to everyone’s PHP programming design.

http://www.bkjia.com/PHPjc/1044852.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1044852.htmlTechArticle SESSION is stored in the database usage examples, session storage examples This article describes the usage of SESSION stored in the database. Share it with everyone for your reference. The details are as follows: php/*CREATE TABL...