使用 Blob 将图像上传到 MySQL 数据库

问题描述

首先澄清一下，我知道有更好的方法可以做到这一点，但我决心进行实验.

Just to first clarify, I know there are better ways to do this, but I'm determined to experiment.

基本上，我试图从表单帖子中获取图像，然后将其发送到数据库 MEDIUMBLOB 字段中.

Basically, I'm trying to grab an image from a form post, then send that into a database MEDIUMBLOB field.

不幸的是，使用我当前的方法，数据库列中的最终结果始终为零字节.

Unfortunately, using my current method, the end result in the database column is always zero bytes. phpMyAdmin Screenshot

这里是表单上传图片的代码:

Here is the code for the image upload on the form:

input type="file" name="_imagePost">

这是页面上的 PHP 代码，我使用的是 MySQLi :

Here is the PHP code on the page, I'm using MySQLi :

    if(isset($_POST['_imagePost']))
    {
        $_useImagePost = 1;
        $_imagePost = file_get_contents($_FILES['_imagePost']);

        // Open DB Connection
        $_conn = databaseConnect();

        $_stmt = $_conn->prepare("INSERT INTO Question (Question_Type, Question_Text, Question_Answer, Question_UseImage, Question_Image) VALUES (?, ?, ?, ?, ?)");
        $_stmt->bind_param("sssib", $_typePost, $_textPost, $_answerPost, $_useImagePost, $_null);
        $_stmt->send_long_data(4,$_imagePost);
        $_stmt->execute();

        // Close DB Connection
        $_conn->close();
    }

我不确定的是，当输入类型为文件时，isset($_POST['_imagePost'])"是否有效.

What I am unsure of is if "isset($_POST['_imagePost'])" works when the input type is file.

然而，我可以肯定的是，当前的设置根本不起作用.

What I am sure of, however, is that the current setup doesn't work at all.

推荐答案

你写的:

$_imagePost = file_get_contents($_FILES['_imagePost']);

正确的语法是:

$_imagePost = file_get_contents($_FILES['_imagePost']['tmp_name']);

$_FILES 是一个带有以下键的关联数组:

$_FILES is an associative array whit following keys:

• [name] => 原始文件名；
• [type] => 上传文件的 mimetype;
• [tmp_name] => 临时文件路径(上传文件的存储位置)；
• [错误] => 错误；
• [size] => 上传文件的大小.

• 查看更多关于$_FILES

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