<?php
$hostname_login = "localhost"; // Server address
$username_login = "root"; // User name 
$password_login = ""; // Password
//
$data_name = "session"; // Database name
$login = mysql_pconnect($hostname_login, $username_login, $password_login) or trigger_error(mysql_error(),E_USER_ERROR); 
$sql="SHOW DATABASES LIKE '".$data_name."'"; // If it is exist
if($rs_table=mysql_query($sql,$login)) { 
  if($rs_value=mysql_fetch_array($rs_table)) { 
   echo "數(shù)據(jù)庫(kù)已經(jīng)存在！\n!";
   exit(); 
  } 
}
$sql="CREATE DATABASE $data_name";   
mysql_query($sql); // Crate database
echo "數(shù)據(jù)庫(kù)創(chuàng)建成功！\n"; 
mysql_select_db($data_name, $login);
$sql="CREATE TABLE `sessions` ( 
`SessionKey` varchar(32) NOT NULL default '', 
`SessionArray` blob NOT NULL, 
`SessionExpTime` int(20) unsigned NOT NULL default '0', 
PRIMARY KEY (`SessionKey`), 
KEY `SessionKey` (`SessionKey`) 
) ENGINE=MyISAM DEFAULT CHARSET=utf8"; //新建數(shù)據(jù)庫(kù) sql語(yǔ)句
mysql_query($sql);
echo "成功新建數(shù)據(jù)庫(kù)表！";
?>

<?php  
class MysqlSession {
// 注意在有使用Session的頁(yè)面。頁(yè)面一定要頂格，頁(yè)面開(kāi)始處不能留空。
private $DB_SERVER = "localhost"; // 數(shù)據(jù)庫(kù)服務(wù)器主機(jī)名
  private $DB_NAME = ""; // 數(shù)據(jù)庫(kù)名字
  private $DB_USER = "root"; // MYSQL 數(shù)據(jù)庫(kù)訪問(wèn)用戶(hù)名 
  private $DB_PASS = ""; // MYSQL 數(shù)據(jù)庫(kù)訪問(wèn)密碼 
   
  private $DB_SELECT_DB = ""; 
//private $SESS_LIFE = 1440; // Session的最大使用時(shí)長(zhǎng)，單位秒。
private $SESS_LIFE = 0;
function MysqlSession (&$sessionDB) {
  //session_write_close();
  $this->DB_NAME = &$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){  // 打開(kāi)數(shù)據(jù)庫(kù)連接
  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();
    // 過(guò)期不讀取。
    $Result = mysql_query($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過(guò)期時(shí)間，Session過(guò)期時(shí)間 = 最后一次更新時(shí)間 + Session的最大使用時(shí)長(zhǎng)
  $SessionArray = addslashes($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) {
// 這個(gè)垃圾清除器系統(tǒng)調(diào)用。默認(rèn)是1440秒清除一次。
//參數(shù)可以在PHP.ini里面設(shè)置。
  $Query = "DELETE FROM sessions WHERE SessionExpTime < " . time(); 
  $Result = mysql_query($Query, $this->DB_SELECT_DB); 
  return mysql_affected_rows($this->DB_SELECT_DB); 
} 
}
?>