Ich kenne nicht den richtigen Weg zu meinem db in meinem Login-Modell zu verbinden, ich benutze (oop - mysqli)

Question

ich lerne oop, ich habe diese Schleppfehler (mysqli_query() erwartet Parameter 1 zu sein mysqli, null, gegeben in C: \ wamp \ www \ oop2 \ model \ login.php in Zeile 38,: mysqli_num_rows() erwartet Parameter 1 als mysqli_result, null in C: \ wamp \ www \ oop2 \ model \ login. php in Zeile 40) und ich weiß nicht, wie der richtige Weg zu meinem db in oop und mysqli verbinden.

Datenbank verbinden Datenbank

class Database 
{ 
private $host; 
private $user; 
private $password; 
private $database; 

function __construct($filename) 
{ 
    if(is_file($filename)) include $filename; 
    else throw new Exception("Error!"); 

    $this->host  = $host; 
    $this->user  = $user; 
    $this->password = $password; 
    $this->database = $database; 

    $this->connect(); 
} 

public function connect() 
{ 
    // connect to the server 
    if(!mysqli_connect($this->host,$this->user, $this->password,$this->database)) 
     throw new Exception("Error: not connected to the server.");   

} 

function close() 
{ 
    mysql_close(); 
} 
} 

Login Modell verbinden

class Login{ 

private $username; 
private $password; 
private $cxn; 

public function __construct($username,$password) 
{ 
    $this->setData($username,$password); 
    $this->connectToDb(); 
    $this->getData(); 
} 

private function setData($username,$password) 
{ 
    $this->username = $username; 
    $this->password = $password; 
} 
private function connectToDb() 
{ 
    include '../model/database.php'; 
    $config = "../model/config.php"; 
    $this->cxn = new Database($config); 
    $this->cxn->connect(); 

} 

public function getData() 
{ 
     $query = "SELECT * FROM admin 
       WHERE 
       'username' = '$this->username' 
       AND 
       'password' = '$this->password' 
        "; 
     $sql = mysqli_query($this->cxn->connect(),$query); 

     if (mysqli_num_rows($sql) > 0) 
     { 
      return TRUE; 
     } 

     else 
     { 
      throw new Exception("Error Processing Request"); 

     } 
} 
public function close() 
{ 
    $this->cxn->close(); 
} 

} 

Answer 1

mysqli_connect gibt ein Link-Objekt für die Verbindung zum MySQL-Server

class Login{ 

private $username; 
private $password; 
private $cxn; 

public function __construct($username,$password) 
{ 
    $this->setData($username,$password); 
    $this->connectToDb(); 
    $this->getData(); 
} 

private function setData($username,$password) 
{ 
    $this->username = $username; 
    $this->password = $password; 
} 
private function connectToDb() 
{ 
    include '../model/database.php'; 
    $config = "../model/config.php"; 
    $this->cxn = new Database($config, $host, $user, $password, $database); 
    $this->cxn->connect(); 

} 

public function getData() 
{ 
     $query = "SELECT * FROM admin 
       WHERE 
       'username' = '$this->username' 
       AND 
       'password' = '$this->password' 
        "; 
     $sql = mysqli_query($this->cxn->connect(),$query); 

     if (mysqli_num_rows($sql) > 0) 
     { 
      return TRUE; 
     } 

     else 
     { 
      throw new Exception("Error Processing Request"); 

     } 
} 
public function close() 
{ 
    $this->cxn->close(); 
} 

} 

Und Ihre Datenbank-Klasse ändern. In Ihrer Database Klasse müssen Sie den Rückgabewert von mysqli_connect sparen:

class Database { 
    private $host; 
    private $user; 
    private $password; 
    private $database; 
    private $connection; //Add this 

Dann:

public function connect() { 

    if(!$this->connection) { 
     // connect to the server 
     $this->connection = mysqli_connect($this->host,$this->user, $this->password,$this->database); 
     //Do some error checking here ! 
    } 
    return $this->connection;   

} 

Answer 2

Sie müssen $ host, $ user, $ password und $ Datenbank DataBase Klasse wie folgt übergeben. mit diesem

class Database 
{ 
private $host; 
private $user; 
private $password; 
private $database; 

function __construct($filename, $host, $user, $password, $database) 
{ 
    if(is_file($filename)) include $filename; 
    else throw new Exception("Error!"); 

    $this->host  = $host; 
    $this->user  = $user; 
    $this->password = $password; 
    $this->database = $database; 

    $this->connect(); 
} 

public function connect() 
{ 
    // connect to the server 
    if(!mysqli_connect($this->host,$this->user, $this->password,$this->database)) 
     throw new Exception("Error: not connected to the server.");   

} 

function close() 
{ 
    mysql_close(); 
} 
}