使用PDO数据库连接类来获取数据

Question

class dbconnect extends PDO {
  private $dbengine   = 'mysql';
  private $dbhost     = 'localhost';
  private $dbuser     = 'root';
  private $dbpassword = 'root';
  private $dbname     = 'nesiojami';
  public $dbh = null;

  public function __construct() {
    try {
      $pdo = $this->dbh = new PDO("".$this->dbengine.":host=$this->dbhost; dbname=$this->dbname", $this->dbuser, $this->dbpassword);
      $pdo = $this->dbh->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_OBJ);
    }
    catch (PDOException $e) {
      $e->getMessage();
    }
  }
}

This is how I connecting to the database.

$clients = $pdo->query("SELECT client-name, client-surname FROM clients")->fetchAll(PDO::FETCH_ASSOC);

And I can't find a way how to fetch data with my connection to the database.

Answer 1

call the PDO constructor in construct function of dbconnect class

$con= dbconnect new ();

$clients = $con->query("SELECT client-name, client-surname FROM clients")->fetchAll(PDO::FETCH_ASSOC);

Read this question for more info

Answer 2

class DbConnect extends PDO {
    private $dbengine   = 'mysql';
    private $dbhost     = 'localhost';
    private $dbuser     = 'root';
    private $dbpassword = 'root';
    private $dbname     = 'nesiojami';
    public $dbh = null;

    public function __construct() {
        try {
            // since you are extending PDO, you have to call its constructor
            parent::connect($this->dbengine.":host=$this->dbhost; dbname=$this->dbname", $this->dbuser, $this->dbpassword);
            $this->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_OBJ);
        }
        catch (PDOException $e) {
            echo $e->getMessage();
        }
    }
}

Use it like this:

$pdo = new DbConnect;
$clients = $pdo->query("SELECT client-name, client-surname FROM clients")->fetchAll(PDO::FETCH_ASSOC);