/**
* 获取数据库中有多少条记录
*
* @param string $sql SQL语句
* @return integer 数据记录数
*/
private function _amount($sql)
{
if (stripos($sql, 'GROUP BY') !== false) {
$this->_db->query($sql);
$row_nu = $this->_db->num_rows();
} else {
$res = $this->_db->fetch_row($sql);
$row_nu = $res['CNUM'];
}
$this->_db->free();
$this->amount = $row_nu;
return $this->amount;
}
/**
* 定时去清除过期的SESSION
*
* @param integer $max_life_time
* @return boolean
*/
public function gc($max_life_time)
{
if ($this->_type == 'db' || $this->_type == 'mdb') {
$this->_db->query("DELETE FROM {$this->_opt} WHERE sExpires < " . time());
} else {
if ($this->_type == 'file') {
self::kill_sfile($this->_path);
} else {
if ($this->_type == 'dir') {
$dir = 'abcdefghijklmnopqrstuvwxyz';
$len = strlen($dir);
for ($i = 0; $i < $len; ++$i) {
self::kill_sfile("{$this->_path}/{$dir[$i]}");
}
}
}
}
return true;
}
