Php 两个PDO连接错误
嘿,伙计们,我最近转到了PDO和OOP,在连接语句方面遇到了一些问题。我收到的错误是 注意:第14行的C:\Users\PC\Documents\XAMPP\htdocs\libs\class.Manage.php中未定义的变量:db\u hostPhp 两个PDO连接错误,php,Php,嘿,伙计们,我最近转到了PDO和OOP,在连接语句方面遇到了一些问题。我收到的错误是 注意:第14行的C:\Users\PC\Documents\XAMPP\htdocs\libs\class.Manage.php中未定义的变量:db\u host class ManageHits{ protected $link; protected $db_host = "localhost"; protected $db_name = "ajaxrating"; protected $db_user =
class ManageHits{
protected $link;
protected $db_host = "localhost";
protected $db_name = "ajaxrating";
protected $db_user = "userone";
protected $db_pass = "passwordone";
function __construct(){
try{
$this->link = new PDO($this->$db_host,$this->$db_name,$this->$db_user,$this->$db_pass);
return $this->link;
}
catch(PDOException $e){
return $e->getMessage;
}
}
致命错误:无法访问第14行C:\Users\PC\Documents\XAMPP\htdocs\libs\class.Manage.php中的空属性
class ManageHits{
protected $link;
protected $db_host = "localhost";
protected $db_name = "ajaxrating";
protected $db_user = "userone";
protected $db_pass = "passwordone";
function __construct(){
try{
$this->link = new PDO($this->$db_host,$this->$db_name,$this->$db_user,$this->$db_pass);
return $this->link;
}
catch(PDOException $e){
return $e->getMessage;
}
}
class ManageHits{
protected $link;
function __construct($db){
$this->link = $db;
}
}
您在
新PDO()中错误地调用了对象。
:
应该是
$this->db_host // and so forth
您应该阅读关于PDO的逐步教程 此外,您的代码有许多问题
class Con{
protected $link;
protected $db_host;
protected $db_name;
protected $db_user;
protected $db_pass;
public function __construct(){
$this->db_host = "localhost";
$this->db_name = "ajaxrating";
$this->db_user = "userone";
$this->db_pass = "passwordone";
try{
$this->connection = new PDO("mysql:host=$this->db_host;dbname=$this->db_name", $this->db_user, $this->db_pass, array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8"));
echo 'Connection established!';
}
catch(PDOException $e){
echo $e->getMessage();
}
}
}
$db = new Con();
非常感谢,我将参加Youtube的OOP和PDO系列节目