<?php
class database
{
    private $host = 'localhost';
    private $dbName = 'phppdotest';
    private $user = 'root';
    private $pass = '';

    private $dbh;
    private $error;
    private $qError;

    private $stmt;

    public function __construct()
    {
        //dsn for mysql
        $dsn     = "mysql:host=" . $this->host . ";dbname=" . $this->dbName;
        $options = array(
            PDO::ATTR_PERSISTENT => true,
            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
        );

        try {
            $this->dbh = new PDO($dsn, $this->user, $this->pass, $options);
        }
        catch (PDOException $e) {
            $this->error = $e->getMessage();
        }

    }

    public function query($query)
    {
        $this->stmt = $this->dbh->prepare($query);
    }

    public function bind($param, $value, $type = null)
    {
        if (is_null($type)) {
            switch (true) {
                case is_int($value):
                    $type = PDO::PARAM_INT;
                    break;
                case is_bool($value):
                    $type = PDO::PARAM_BOOL;
                    break;
                case is_null($value):
                    $type = PDO::PARAM_NULL;
                    break;
                default:
                    $type = PDO::PARAM_STR;
            }
        }
        $this->stmt->bindValue($param, $value, $type);
    }

    public function execute()
    {
        return $this->stmt->execute();

        $this->qError = $this->dbh->errorInfo();
        if (!is_null($this->qError[2])) {
            echo $this->qError[2];
        }
        echo 'done with query';
    }

    public function resultset($type = false)
    {
        $this->execute();
        if (!$type) {
          return $this->stmt->fetchAll(PDO::FETCH_ASSOC);
        }else{
          return $this->stmt->fetchAll(PDO::FETCH_OBJ);
        }
    }
    public function single($type = false)
    {
        $this->execute();
        if (!$type) {
          return $this->stmt->fetch(PDO::FETCH_ASSOC);
        }else{
          return $this->stmt->fetch(PDO::FETCH_OBJ);
        }
    }

    public function rowCount()
    {
        return $this->stmt->rowCount();
    }

    public function lastInsertId()
    {
        return $this->dbh->lastInsertId();
    }

    public function beginTransaction()
    {
        return $this->dbh->beginTransaction();
    }

    public function endTransaction()
    {
        return $this->dbh->commit();
    }

    public function cancelTransaction()
    {
        return $this->dbh->rollBack();
    }

    public function debugDumpParams()
    {
        return $this->stmt->debugDumpParams();
    }

    public function queryError()
    {
        $this->qError = $this->dbh->errorInfo();
        if (!is_null($qError[2])) {
            echo $qError[2];
        }
    }
}

$db = new database();

if (isset($_GET['a'])) {
  if ($_GET['a'] == 'show') {
    $db->query('SELECT * FROM users');
    $rows = $db->resultset();

    foreach ($rows as $row) {
      echo "Name ".$row['name']." Age ".$row['age']." Sex ".$row['sex']."<br>";
    }
  }elseif ($_GET['a'] == 'insert') {
    $db->query('INSERT INTO users (name, age, sex) VALUES(:name, :age, :sex)');
    $db->bind(':name', 'Aboo Thahir 1');
    $db->bind(':age', '24');
    $db->bind(':sex', 'Male');
    $db->execute();
    header('Location: phppdo.php?a=show');
  }
}
?>