使用Blob将映像上传到MySQL数据库 [英] Uploading An Image To A MySQL Database Using A Blob

问题描述

首先要澄清一下，我知道有更好的方法可以做到这一点，但我决心进行试验.

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

基本上，我正在尝试从表单发布中获取图像，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. phpMyAdmin屏幕截图

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

这是在表单上上传图片的代码:

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，我正在使用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file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.

但是，我确定的是，当前设置根本无法使用.

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

推荐答案

您编写:

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

正确的语法是:

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

$_FILES是以下键的关联数组:

$_FILES is an associative array whit following keys:

• [名称] => 原始文件名；
• [type] =>上传文件的模仿类型；
• [tmp_name] =>临时文件路径(存储上传文件的位置)；
• [错误] =>错误；
• [大小] =>上传文件的大小.

• [name] => Original file name;
• [type] => mimetype of uploaded file;
• [tmp_name] => temporary filepath (where uploaded file is stored);
• [error] => error;
• [size] => size of uploaded file.

• 详细了解 $ _FILES

这篇关于使用Blob将映像上传到MySQL数据库的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！