Как переделать подключение?

Как переделать подключение под mssql ?

<?php
    class DBController {
        private $host = "localhost";
        private $user = "root";
        private $password = "";
        private $database = "phppot_examples";
        private $conn;
        function __construct() {
            $this->conn = $this->connectDB();
        }
        function connectDB() {
            $conn = mysqli_connect($this->host,$this->user,$this->password,$this->database);
            return $conn;
        }
        function runQuery($query) {
            $result = mysqli_query($this->conn,$query);
            while($row=mysqli_fetch_assoc($result)) {
                $resultset[] = $row;
            }       
            if(!empty($resultset))
                return $resultset;
        }
        function numRows($query) {
            $result  = mysqli_query($this->conn,$query);
            $rowcount = mysqli_num_rows($result);
            return $rowcount;   
        }
    }
    ?>

Есть обычное подключение к MSSQL

function getUNS()
{
$connectionInfo = array( "Database"=>"Data", "UID"=>"IDBAS", "PWD"=>"PASS");
$conn = sqlsrv_connect( "localhost", $connectionInfo);
 return $conn;
}