How can I insert an image in MySQL and then retrieve it using PHP?
I have limited experience in either area, and I could use a little code to get me started in figuring this out.
First you create a MySQL table to store images, like for example:
create table testblob ( image_id tinyint(3) not null default '0', image_type varchar(25) not null default '', image blob not null, image_size varchar(25) not null default '', image_ctgy varchar(25) not null default '', image_name varchar(50) not null default '' );
Then you can write an image to the database like:
/*** * All of the below MySQL_ commands can be easily * translated to MySQLi_ with the additions as commented ***/ $imgData = file_get_contents($filename); $size = getimagesize($filename); mysql_connect("localhost", "$username", "$password"); mysql_select_db ("$dbname"); // mysqli // $link = mysqli_connect("localhost", $username, $password,$dbname); $sql = sprintf("INSERT INTO testblob (image_type, image, image_size, image_name) VALUES ('%s', '%s', '%d', '%s')", /*** * For all mysqli_ functions below, the syntax is: * mysqli_whartever($link, $functionContents); ***/ mysql_real_escape_string($size['mime']), mysql_real_escape_string($imgData), $size, mysql_real_escape_string($_FILES['userfile']['name']) ); mysql_query($sql);
You can display an image from the database in a web page with:
$link = mysql_connect("localhost", "username", "password"); mysql_select_db("testblob"); $sql = "SELECT image FROM testblob WHERE image_id=0"; $result = mysql_query("$sql"); header("Content-type: image/jpeg"); echo mysql_result($result, 0); mysql_close($link);
Instead of storing images in database store them in a folder in your disk and store their location in your data base.
Beware that serving images from DB is usually much, much much slower than serving them from disk.
You’ll be starting a PHP process, opening a DB connection, having the DB read image data from the same disk and RAM for cache as filesystem would, transferring it over few sockets and buffers and then pushing out via PHP, which by default makes it non-cacheable and adds overhead of chunked HTTP encoding.
OTOH modern web servers can serve images with just few optimized kernel calls (memory-mapped file and that memory area passed to TCP stack), so that they don’t even copy memory around and there’s almost no overhead.
That’s a difference between being able to serve 20 or 2000 images in parallel on one machine.
So don’t do it unless you absolutely need transactional integrity (and actually even that can be done with just image metadata in DB and filesystem cleanup routines) and know how to improve PHP’s handling of HTTP to be suitable for images.