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<?php
/**
* SessionHandler:: implementation for Oracle 8i (native).
*
* Required parameters:<pre>
* 'hostspec' The hostname of the database server.
* 'protocol' The communication protocol ('tcp', 'unix', etc.).
* 'username' The username with which to connect to the database.
* 'password' The password associated with 'username'.
* 'database' The name of the database.
* 'table' The name of the sessiondata table in 'database'.</pre>
*
* Required for some configurations:<pre>
* 'port' The port on which to connect to the database.</pre>
*
* Optional parameters:<pre>
* 'persistent' Use persistent DB connections? (boolean)</pre>
*
* The table structure for the SessionHandler can be found in
* horde/scripts/sql/horde_sessionhandler.oci8.sql.
*
* $Horde: framework/SessionHandler/SessionHandler/oci8.php,v 1.8.4.11 2006/02/10 18:46:53 jan Exp $
*
* Copyright 2003-2006 Liam Hoekenga <liamr@umich.edu>
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
*
* @author Liam Hoekenga <liamr@umich.edu>
* @since Horde 2.2
* @package Horde_SessionHandler
*/
class SessionHandler_oci8 extends SessionHandler {
/**
* Handle for the current database connection.
*
* @var resource
*/
var $_db;
/**
* Are we connected to the SQL server.
*
* @var boolean
*/
var $_connected = false;
/**
* Close the SessionHandler backend.
*
* @return boolean True on success, false otherwise.
*/
function close()
{
if ($this->_connected) {
$this->_connected = false;
return OCILogOff($this->_db);
}
return true;
}
/**
* Read the data for a particular session identifier from the
* SessionHandler backend.
*
* @param string $id The session identifier.
*
* @return string The session data.
*/
function read($id)
{
/* Make sure we have a valid database connection. */
$this->_connect();
$select_query = sprintf('SELECT session_data FROM %s WHERE session_id = %s FOR UPDATE',
$this->_params['table'], $this->_quote($id));
/* Log the query at a DEBUG log level. */
Horde::logMessage(sprintf('SQL Query by SessionHandler_oci8::read(): query = "%s"', $select_query),
__FILE__, __LINE__, PEAR_LOG_DEBUG);
/* Execute query */
$select_statement = OCIParse($this->_db, $select_query);
OCIExecute($select_statement);
if (!OCIFetchInto($select_statement, $result)) {
$insert_query = sprintf('INSERT INTO %s (session_id, session_lastmodified, session_data) VALUES (%s, %s, EMPTY_BLOB()) RETURNING session_data INTO :blob',
$this->_params['table'],
$this->_quote($id),
$this->_quote(time()));
$insert_statement = OCIParse($this->_db, $insert_query);
$lob = OCINewDescriptor($this->_db);
OCIBindByName($insert_statement, ':blob', $lob, -1, SQLT_BLOB);
OCIExecute($insert_statement, OCI_DEFAULT);
if ($session_data) {
$lob->save($session_data);
}
$result = OCICommit($this->_db);
OCIFreeStatement($insert_statement);
OCIExecute($select_statement);
OCIFetchInto($select_statement, $result);
}
$value = $result[0]->load();
OCIFreeStatement($select_statement);
return($value);
}
/**
* Write session data to the SessionHandler backend.
*
* @param string $id The session identifier.
* @param string $session_data The session data.
*
* @return boolean True on success, false otherwise.
*/
function write($id, $session_data)
{
/* Make sure we have a valid database connection. */
$this->_connect();
/* Build the SQL query. */
$query = sprintf('UPDATE %s SET session_lastmodified = %s, session_data = EMPTY_BLOB() WHERE session_id = %s RETURNING session_data INTO :blob',
$this->_params['table'],
$this->_quote(time()),
$this->_quote($id));
/* Log the query at a DEBUG log level. */
Horde::logMessage(sprintf('SQL Query by SessionHandler_oci8::write(): query = "%s"', $query),
__FILE__, __LINE__, PEAR_LOG_DEBUG);
/* Execute query */
$statement = OCIParse($this->_db, $query);
$lob = OCINewDescriptor($this->_db);
OCIBindByName($statement, ':blob', $lob, -1, SQLT_BLOB);
OCIExecute($statement, OCI_DEFAULT);
if ($session_data) {
$lob->save($session_data);
}
$result = OCICommit($this->_db);
if (!$result) {
Horde::logMessage('Error writing session data', __FILE__, __LINE__, PEAR_LOG_ERR);
return false;
}
return true;
}
/**
* Destroy the data for a particular session identifier in the
* SessionHandler backend.
*
* @param string $id The session identifier.
*
* @return boolean True on success, false otherwise.
*/
function destroy($id)
{
/* Make sure we have a valid database connection. */
$this->_connect();
/* Build the SQL query. */
$query = sprintf( 'DELETE FROM %s WHERE session_id = %s',
$this->_params['table'], $this->_quote($id));
/* Log the query at a DEBUG log level. */
Horde::logMessage(sprintf('SQL Query by SessionHandler_oci8::destroy(): query = "%s"', $query),
__FILE__, __LINE__, PEAR_LOG_DEBUG);
/* Execute the query. */
$statement = OCIParse($this->_db, $query);
$result = OCIExecute($statement);
if (!$result) {
OCIFreeStatement($statement);
Horde::logMessage('Failed to delete session (id = ' . $id . ')', __FILE__, __LINE__, PEAR_LOG_ERR);
return false;
}
OCIFreeStatement($statement);
return true;
}
/**
* Garbage collect stale sessions from the SessionHandler backend.
*
* @param integer $maxlifetime The maximum age of a session.
*
* @return boolean True on success, false otherwise.
*/
function gc($maxlifetime = 1)
{
/* Make sure we have a valid database connection. */
$this->_connect();
/* Build the SQL query. */
$query = sprintf('DELETE FROM %s WHERE session_lastmodified < %s',
$this->_params['table'], $this->_quote(time() - $maxlifetime));
/* Log the query at a DEBUG log level. */
Horde::logMessage(sprintf('SQL Query by SessionHandler_oci8::gc(): query = "%s"', $query),
__FILE__, __LINE__, PEAR_LOG_DEBUG);
/* Execute the query. */
$statement = OCIParse($this->_db, $query);
$result = OCIExecute($statement);
if (!$result) {
OCIFreeStatement($statement);
Horde::logMessage('Error garbage collecting old sessions', __FILE__, __LINE__, PEAR_LOG_ERR);
return false;
}
OCIFreeStatement($statement);
return true;
}
/**
* Get a list of the valid session identifiers.
*
* @return array A list of valid session identifiers.
*/
function getSessionIDs()
{
/* Make sure we have a valid database connection. */
$this->_connect();
/* Session timeout, don't rely on garbage collection */
$timeout = time() - ini_get('session.gc_maxlifetime');
$query = sprintf('SELECT session_id FROM %s' .
' WHERE session_lastmodified > %s',
$this->_params['table'],
$timeout);
/* Log the query at a DEBUG log level. */
Horde::logMessage(sprintf('SQL Query by SessionHandler_oci8::getSessionIDs(): query = "%s"', $query),
__FILE__, __LINE__, PEAR_LOG_DEBUG);
/* Execute query */
$statement = OCIParse($this->_db, $query);
OCIExecute($statement);
$sessions = array();
while (OCIFetchInto($statement, $row)) {
$sessions[] = $row[0];
}
OCIFreeStatement($statement);
return $sessions;
}
/**
* Escape a string for insertion. Stolen from PEAR::DB.
* @access private
*
* @param string $value The string to quote.
*
* @return string The quoted string.
*/
function _quote($value)
{
return ($value === null) ? 'NULL' : "'" . str_replace("'", "''", $value) . "'";
}
/**
* Attempts to open a connection to the SQL server.
*
* @access private
*/
function _connect()
{
if ($this->_connected) {
return;
}
Horde::assertDriverConfig($this->_params, 'sessionhandler',
array('hostspec', 'username', 'password'),
'session handler Oracle');
if (!isset($this->_params['table'])) {
$this->_params['table'] = 'horde_sessionhandler';
}
if (function_exists('oci_connect')) {
if (empty($this->_params['persistent'])) {
$connect = 'oci_connect';
} else {
$connect = 'oci_pconnect';
}
} else {
if (empty($this->_params['persistent'])) {
$connect = 'OCILogon';
} else {
$connect = 'OCIPLogon';
}
}
if (!is_resource($this->_db = @$connect($this->_params['username'],
$this->_params['password'],
$this->_params['hostspec']))) {
Horde::fatal(PEAR::raiseError('Could not connect to database for SQL SessionHandler.'), __FILE__, __LINE__);
}
$this->_connected = true;
}
}
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