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：
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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($sessMaxLifeTime) {
// delete old sessions
MysqL_query("DELETE FROM ws_sessions WHERE session_expires < ".time(),$this->dbHandle);
// return affected rows
return MysqL_affected_rows($this->dbHandle);
}
}
$session = new session();
session_set_save_handler(array(&$session,"open"),array(&$session,"close"),"read"),"write"),"destroy"),"gc"));
session_start();
// etc...
?>
希望本文所述对大家的PHP程序设计有所帮助。
