How to update longblob image field in mysql using php - php

Question

if(isset($_POST['submit']) and isset($_GET['slider_id']))
{
$date=date('Y-m-j');
$imgName=$_FILES['image']['name'];
$cont=file_get_contents($imgName);
$cont=addslashes($cont);
if($imgName=="")
{
//$imgData =addslashes(file_get_contents($_FILES['image']['name']));
$res=mysqli_query($connect,'UPDATE `slider_images` SET `image`=\''.$cont.'\' WHERE id=\''.$_GET['slider_id'].'\'');
if($res)
{
echo "Updated";
}
else
{
echo "Not Updated";
}
}
}
Not understanding the real issue behind this and i have refereed many solution's but no success in that.All solution's i found they tell to store images in folder and store the file name in database table.Reason behind storing images in database is, only 4 images are to be stored, so why not to store them in database. Please guide me through this issue. Following is the issue i am talking about.
Warning Message
Thank's in advance.

Answer 1

$_FILES['file']['name'] is the original name of the uploaded file from the user's computer.
$_FILES['file']['tmp_name'] will contain the temporary file name of the file on the server. This is just a temporary placeholder until you process the file.
So you should access the file like this:
$cont=file_get_contents($_FILES['image']['tmp_name']);
Sidenote: Instead of if($res){ ... } use mysqli_affected_rows() to get number of rows affected by this UPDATE query, like this:
mysqli_query($connect,"UPDATE `slider_images` SET `image`='".$cont."' WHERE id='".$_GET['slider_id']."'");
if(mysqli_affected_rows($connect)){
echo "Updated";
}else{
echo "Not Updated";
}
Here's the reference:
mysqli_affected_rows()