本文实例讲述了session存放在数据库用法。分享给大家供大家参考。具体如下：
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? $res = mysql_query(select * from ws_sessions where session_id = '$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($sessmaxlifetime) { // delete old sessions mysql_query(delete from ws_sessions where session_expires dbhandle); // return affected rows return mysql_affected_rows($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...?>
希望本文所述对大家的php程序设计有所帮助。