用VS2015 编辑PHP，连接数据库不是失败就是读不出数据

$gx = mysql_connect("localhost", "root", "root") or die("Could not connect: " . mysql_error());
print ("Connected successfully");
$conn = new mysqli($localhost, $root, $root, $gx);

if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}
$sql = "SELECT member, name, style FROM movice";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // 输出每行数据
    while($row = $result->fetch_assoc()) {
        echo "<br> id: ". $row["member"]. " - Name: ". $row["name"]. " " . $row["style"];
    }
} else {
    echo "0 个结果";
}
$conn->close();

mysql_close($gx);

    显示的是Connected successfully0 个结果 

VS与数据库要怎么链接/配置环境？