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Old February 9th, 2009, 05:50 PM
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Default Comparing image file With Blob data

How to compare Image file with the Image(of blob data type) that is retrieved from the MySQL database.????
 
Old February 21st, 2009, 08:09 PM
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Hi,

When you retrieve the blob it will treat it as a string of unicode characters. Likewise, when you read in a file, it will read in unicode strings and characters. You can therefore do a simple string comparison with == to see if they are the same.
Here is a simple example. Note that it is may be better to stream the file in using fread to save resource, but it is not too hard to implement that.

PHP Code:
<?php

$conn 
mysql_connect('localhost''root''mypass');
mysql_select_db("testing");
$rs mysql_query('SELECT img FROM images WHERE id = 2');
$row mysql_fetch_array($rs);

$image1 $row['img'];
$image2 file_get_contents('mypic.gif');

if(
$image1 == $image2)
  echo 
"SAME!";
else
  echo 
"DIFFERENT!";

?>





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