获取最后插入的预准备语句的id

Question

如何使用预准备语句获取最后插入的查询的id？

我写了一些PHP,但结果只得到"0".我试图用这个问题的答案:关于SO的类似问题

$locationName = $_GET['locationName'];
$locationResume = $_GET['locationResume'];

$sql = "INSERT INTO location (locationTitle, locationResume) VALUES (?,?);";
if ($locationName != null && $locationResume != null ) {

    if ($stmt = $con->prepare($sql)) {
        $stmt->bind_param("ss", $locationName, $locationResume);
        $locationId = $con->insert_id;

        #$locationId = $con->execute();
        echo $locationId;
    }
}

谢谢您的帮助.

Answer 1

只有在执行查询后才能获取last_insert_id.