Image does not show up from mysql database

I'm trying to show an image from my database yet it wont show. I researched and tried different codes that I can understand but it is still no use. Here is my show image php code

<?php

$host="localhost";
$username="root"; // Mysql username 
$password=""; // Mysql password 
$db_tocode="db_tocode"; // Database name 

mysql_connect($host, $username, $password) or die("Can not connect to database:     ".mysql_error());

mysql_select_db($database) or die("Can not select the database: ".mysql_error());

$id = $_GET['id'];

$sql = "SELECT * FROM image WHERE id = '$id';";

 $result = mysql_query($sql) or die(mysql_error());  
$row = mysql_fetch_array($result);

header("Content-type: image/jpeg");
echo $row['image'];


?>

and here is the link to show the image to the site.

     <img src="showimage.php?id=<?php echo $id;?">">
     <div class="text-style"></div>

thanks in advance!

Copyright License：
Author:「bjmonts」,Reproduced under the CC 4.0 BY-SA copyright license with link to original source & disclaimer.
Link to：https://stackoverflow.com/questions/21911631/image-does-not-show-up-from-mysql-database