PHP 表格插入到 MySQL NULL 允许的值

Question

我有一个提交给 php 文件的表单，该文件将数据插入到 MySQL 中的表中，此表单中有一些字段可能无法填写，如果是这种情况，即使我设置了记录也不会插入MySQL 中的字段接受空值

我的代码

<?php
    session_start();
    include "includes/connection.php";

    $title          = $_POST['inputTitle'];
    $firstname      = $_POST['inputFirstname'];
    $lastname       = $_POST['inputLastName'];
    $address1       = $_POST['inputAddress1'];
    $address2       = $_POST['inputAddress2'];
    $city           = $_POST['inputCity'];
    $county         = $_POST['inputCounty'];
    $postcode       = $_POST['inputPostcode'];
    $email          = $_POST['inputEmail'];
    $homephone      = $_POST['inputHomephone'];
    $mobilephone    = $_POST['inputMobilephone'];
    $userid         = $_POST['inputUserID'];

    if($title == '' || $firstname == '' || $lastname == '' || $address1 == '' || $address2 == '' || $city == '' || $county == '' || $postcode == '' || $email == '' || $homephone == '' || $mobilephone == '' || $userid == ''){
        $_SESSION['status'] = 'error';
    } else {
        mysql_query("INSERT INTO contact
                (`id`,`user_id`,`title`,`firstname`,`lastname`,`address1`,`address2`,`city`,`county`,`postcode`,`email`,`homephone`,`mobilephone`)
VALUES(NULL,'$userid','$title','$firstname','$lastname','$address1','$address2','$city','$county','$postcode','$email','$homephone','$mobilephone')") or die(mysql_error());
        $_SESSION['status'] = 'success';
    }
    header("location: contacts.php");
?> 

谁能告诉我我需要改变什么来解决这个问题？

最好的

贾斯汀

Ps 抱歉，如果代码块有点长，但我认为它与这个问题有关。

Answer 1

您应该更改您的分配（对于可以为空的列），例如

$title = empty( $_POST['inputTitle'] )
 ? 'NULL'
 : "'" . mysql_real_escape_string( $_POST['inputTitle'] ) . "'"
;

在您的查询中，您必须删除变量周围的引号。