Storing and displaying images from MySQL with PHP

Question

How can I store a image file in MySQL with PHP by sending the image from a HTML form? I only know the MySQL and HTML part of the stuff.

Here's the HTML form:

<form method="post" enctype="multipart/form-data" action="insert_image.php">
    <input type="file" name="image" />
    <input type="submit" />
</form>

I know how to connect to the database and store normal information, but how can I parse the data correctly to store the image file to a MySQL BLOB field? And also how can I display it from MySQL?

ps: Im using PDO to do the database connections.

Answer 1

<?php

# getting the uploaded image and storing it
if ( isset($_FILES['image']['tmp_name']) ) {
    // open mysqli db connection
    $mysqli = new mysqli($mysqliHost,$mysqliUsername,$mysqliPassword,$mysqliDatabase);

    // get image data
    $binary = file_get_contents($_FILES['image']['tmp_name']);

    // get mime type
    $finfo = new finfo(FILEINFO_MIME);
    $type = $finfo->file($_FILES['image']['tmp_name']);
    $mime = substr($type, 0, strpos($type, ';'));

    $query = "INSERT INTO `images` 
                    (`data`,`mime`,`name`) 
    VALUES('".$mysqli->real_escape_string($binary)."',
            '".$mysqli->real_escape_string($mime)."',
            '".$mysqli->real_escape_string($_FILES['image']['name'])."')";
    $mysqli->query($query);
}

# viewing the uploaded image
if ( isset($_GET['imageName']) ) {
    // open mysqli db connection
    $mysqli = new mysqli($mysqliHost,$mysqliUsername,$mysqliPassword,$mysqliDatabase);

    // query for the image in the db
    $query = "SELECT `data`,`mime` FROM `images` WHERE `name`='".$mysqli->real_escape_string($_GET['imageName'])."'";
    $result = $mysql->query($query);


    if ( $result->num_rows ) {
        // grab the query result from the db select
        $assoc = $result->fetch_assoc();

        // let the client browser know what type of data you're sending
        header('Content-type: '.$assoc['mime']);

        // dump the binary data to the browser
        echo $assoc['data'];
        exit;
    } else {
        header('HTTP/1.1 404 Not Found');
        exit;
    }
}

?>

My script does not account for images with the same name, you can swap out the part where it says $_FILES['image']['name'] to another variable that has/creates a unique name for it, or use the inserted ID (PRIMARY AUTO_INCREMENT MySQL key).

Here is a sample table schema:

CREATE TABLE `images` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `data` longblob NOT NULL,
  `mime` varchar(50) NOT NULL,
  `name` varchar(255) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `name` (`name`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

Answer 2

Its the same for anything you store in the database: Grab the bytes you want to store and escape them when adding them to the query string.

This is like:

$image = file_get_contents($image_file_name);
$query = "INSERT INTO img SET image = \"".mysqli_real_escape_string($image)."\"";

Answer 3

Really the best practices says than you need store the image in some folder and save the path or the name in the database.

this could help you: http://www.htmlgoodies.com/beyond/php/article.php/3877766/Web-Developer-How-To-Upload-Images-Using-PHP.htm

Saving image from PHP URL

Answer 4

You can actually get the raw contents of the uploaded image file with file_get_contents , escape it, and then store it in the DB as a blob. To display it you can actually just echo out the blob after setting the appropriate content-type.

However, I wouldn't do it that way. Instead I would store the image on the disk and store the location of the image file in MySQL.

Answer 5

就个人而言，当我创建一个需要这样的网站 （ 这个网站 ）时，我将文件存储在文件系统中，并将目录添加到数据库中，确保每个jpg都有一个唯一的文件名。