class dbhelper {
private $db;
function _construct() {
try {
$this->db = new PDO('sqlite:data.pak');
} catch (PDOException $e) {
exit('连接失败:' . $e->getMessage());
}
}
function getUserList() {
$record = $this->db->query("select * from t_user");
$result = $record->fetchAll();
return $result;
}
$this->db 只在构造函数中有效。
求解决,示解释。