php mysqli mysql数据库添加新值

因此，我在尝试向数据库添加新值时出错，代码如下：

<?php 

include 'config.php';
$con=mysqli_connect("localhost","labas_main","1Ym9ZnPP","labas_main");

if (mysqli_connect_errno())
  {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  }

        $field1 = isset( $_POST['darbuotojas']) ? $_POST['darbuotojas'] : "";
        $field2 = isset( $_POST['objektas']) ? $_POST['objektas'] : "";
        $field3 = isset( $_POST['dirbo']) ? $_POST['dirbo'] : "";
        //atstatom busena i INT kintamaji
            if ($field3 == "ne") {
            $field3=0;
            }
                elseif ($field3 == "taip") {
                $field3=1;
                }
            else $field3=2;
        $field4 = isset( $_POST['data']) ? $_POST['data'] : "";






            mysqli_query($con,"INSERT INTO 'suvestine' ('atsiskaitymas', 'darbuotojo_ID', 'data', 'objekto_ID')
                                VALUES ('".$field3."', '".$field1."', '".$field4."', '".$field2."')";




?>

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您的查询错误：
引号
和缺少的
）

非常感谢谢林格特。今天需要休息：）太好了！请标出正确答案；-）
mysqli_query($con,"INSERT INTO suvestine (atsiskaitymas, darbuotojo_ID, data, objekto_ID) VALUES ('".$field3."', '".$field1."', '".$field4."', '".$field2."')");