Database pdo class for php

<?php

// Uncomment line to check for debug, if issue with extention.
// echo defined('PDO::ATTR_DRIVER_NAME') ? "PDO loaded" : "PDO unavailable";

class Database{
    public $isConn;
    protected $datab;

    // connection to db
    public function __construct($username = "*****", $password = "*****", $host = "localhost", $dbname = "mukeshdak", $options = [])
    {
        // by default assume successful connection.
        $this->isConn = TRUE;

        try {
            $this->datab = new PDO("mysql:host={$host};dbname={$dbname};charset=utf8", $username, $password, $options);
            $this->datab->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
            $this->datab->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
        }
        catch (PDOException $e)
        {
            throw new Exception($e->getMessage());
        }
    }

    // disconnect from db
    public function Disconnect()
    {
        $this->datab = NULL;
        $this->isConn = FALSE;
    }

    // get row
    public function getRow($query, $params = [])
    {
        try {
            $stmt = $this->datab->prepare($query);
            $stmt->execute($params);
            return $stmt->fetch();
        } catch (PDOException $e) {
            throw new Exception($e->getMessage());
        }
    }

    // get rows
    public function getRows($query, $params = [])
    {
        try {
            $stmt = $this->datab->prepare($query);
            $stmt->execute($params);
            return $stmt->fetchAll();
        } catch (PDOException $e) {
            throw new Exception($e->getMessage());
        }
    }

    // insert row
    public function insertRow($query, $params = [])
    {
        try {
            $stmt = $this->datab->prepare($query);
            $stmt->execute($params);
            return TRUE;
        } catch (PDOException $e) {
            throw new Exception($e->getMessage());
        }
    }

    // update row
    public function updateRow($query, $params = [])
    {
        $this->insertRow($query, $params);
    }

    // delete row
    public function deleteRow($query, $params = [])
    {
        $this->insertRow($query, $params);
    }

    public function die_r($value)
    {
        echo "<pre>";
        print_r($value);
        echo "</pre>";
        die();
    }
}

$db = new Database;

$row = $db->getrow("SELECT * from boiler WHERE id=?", ["4"]);
$db->die_r($row);

// other example uses.

// $getRow = $db->getRow("SELECT * FROM users WHERE username = ?", ["admin"]);
// $getRows = $db->getRows("SELECT * FROM users");
// $insertRow = $db->insertRow("INSERT INTO users(username, password, email) VALUE(?, ?, ?)", ["Arthur", "102030", "arthur@localhost"]);
// $updateRow = $db->updateRow("UPDATE users SET username = ?, password = ? WHERE id = ?", ["ArthurMann", "a123456", "7"]);
// $deleteRow = $db->deleteRow("DELETE FROM users WHERE id = ?", [8]);

// $db->Disconnect();

?>