Question

How can i restore or access MySQL blob field so I can preview it as HTML using PHP codes? Is there an available function in PHP so I can store as jpeg those blob field.

Answer 1

Storing is easy. Assuming you have a mysql table with BLOB field for pictures….

Once the image is uploaded you get the contents of the file into memory and then insert into the blob field.

<?php 

 $file = '/tmp/MyImg.jpg'; 
 // you migh want to escape it just in case
 $data = file_get_contents($file); 
 // Insert into database
 $sql = "INSERT INTO my_picture_table (`picture_blob_field`) VALUES ('$data');"

 ?>

Retrieving is fairly simple as well. It is simpler to make a separate file to load images from blob.

<?php
// file = getPicture.php

$id = (int) $_GET['id'];
$sql = "SELECT `picture_blob_field` FROM `my_picture_table` WHERE `id` = $id"
// query the db
// store data into var $picData

// Set the content type and print the data.
header("Content-type: img/jpeg");
echo $picData;

?>

This is all you have to do… Now in HTML page just create an

<img scr="getPicture.php?id=PICTURE_ID alt="blah blah" />

Note that above example is for JPEG type, store the file type in the db and then use it to specify file type with header("Content-type: img/xxx")

Hope this solved your problem.

---

I found an example/tutorial on storing images in mysql. If above is not clear look through the code (its paginated, so look at the other pages)