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151 lines
4.1 KiB
151 lines
4.1 KiB
<?php
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/* For licensing terms, see /license.txt */
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/**
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* This class allows to manage the session. Session is stored in the database.
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*
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* @package chamilo.library
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*/
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/**
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* @package chamilo.library
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*/
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class SessionHandlerDatabase {
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// TODO: Hm, these variables are public.
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public $connection;
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public $connection_handler;
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public $lifetime;
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public $session_name;
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public function __construct() {
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global $_configuration;
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$this->lifetime = 60; // 60 minutes
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$this->connection = array(
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'server' => $_configuration['db_host'],
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'login' => $_configuration['db_user'],
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'password' => $_configuration['db_password'],
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'base' => $_configuration['main_database']
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);
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$this->connection_handler = false;
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}
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public function sqlConnect() {
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if (!$this->connection_handler) {
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$this->connection_handler = @mysql_connect($this->connection['server'], $this->connection['login'], $this->connection['password'], true);
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// The system has not been designed to use special SQL modes that were introduced since MySQL 5
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@mysql_query("set session sql_mode='';", $this->connection_handler);
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@mysql_select_db($this->connection['base'], $this->connection_handler);
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// Initialization of the database connection encoding to be used.
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// The internationalization library should be already initialized.
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@mysql_query("SET SESSION character_set_server='utf8';", $this->connection_handler);
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@mysql_query("SET SESSION collation_server='utf8_general_ci';", $this->connection_handler);
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$system_encoding = api_get_system_encoding();
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if (api_is_utf8($system_encoding)) {
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// See Bug #1802: For UTF-8 systems we prefer to use "SET NAMES 'utf8'" statement in order to avoid a bizarre problem with Chinese language.
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@mysql_query("SET NAMES 'utf8';", $this->connection_handler);
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} else {
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@mysql_query("SET CHARACTER SET '" . Database::to_db_encoding($system_encoding) . "';", $this->connection_handler);
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}
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}
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return $this->connection_handler ? true : false;
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}
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public function sqlClose() {
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if ($this->connection_handler) {
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mysql_close($this->connection_handler);
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$this->connection_handler = false;
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return true;
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}
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return false;
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}
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public function sqlQuery($query, $die_on_error = true) {
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$result = mysql_query($query, $this->connection_handler);
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if ($die_on_error && !$result) {
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$this->sqlClose();
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return;
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}
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return $result;
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}
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public function open($path, $name) {
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$this->session_name = $name;
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return true;
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}
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public function close() {
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return $this->garbage(0) ? true : false;
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}
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public function read($sess_id) {
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if ($this->sqlConnect()) {
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$result = $this->sqlQuery("SELECT session_value FROM ".$this->connection['base'].".php_session WHERE session_id='$sess_id'");
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if ($row = mysql_fetch_assoc($result)) {
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return $row['session_value'];
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}
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}
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return '';
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}
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public function write($sess_id, $sess_value) {
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$time = time();
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if ($this->sqlConnect()) {
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$result = $this->sqlQuery("INSERT INTO ".$this->connection['base'].".php_session(session_id,session_name,session_time,session_start,session_value) VALUES('$sess_id','".$this->session_name."','$time','$time','".addslashes($sess_value)."')", false);
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if (!$result) {
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$this->sqlQuery("UPDATE ".$this->connection['base'].".php_session SET session_name='".$this->session_name."',session_time='$time',session_value='".addslashes($sess_value)."' WHERE session_id='$sess_id'");
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}
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return true;
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}
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return false;
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}
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public function destroy($sess_id) {
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if ($this->sqlConnect()) {
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$this->sqlQuery("DELETE FROM ".$this->connection['base'].".php_session WHERE session_id='$sess_id'");
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return true;
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}
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return false;
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}
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public function garbage($lifetime) {
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if ($this->sqlConnect()) {
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$result = $this->sqlQuery("SELECT COUNT(session_id) FROM ".$this->connection['base'].".php_session");
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list($nbr_results) = Database::fetch_row($result);
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if ($nbr_results > 5000) {
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$this->sqlQuery("DELETE FROM ".$this->connection['base'].".php_session WHERE session_time<'".strtotime('-'.$this->lifetime.' minutes')."'");
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}
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$this->sqlClose();
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return true;
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}
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return false;
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}
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}
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