Wordpress featured image

gistfile1.php

$sql="SELECT * FROM wp_postmeta WHERE `meta_key` LIKE '_thumbnail_id'" ;
$result=mysql_query($sql) or die (mysql_error());
while ($var = mysql_fetch_array($result) ) {

	$post_id = $var['post_id'];
	$meta_id = $var['meta_id'];
	print 'post_id : '.$post_id.'<p></p>';
 		
	$sql2="SELECT * FROM wp_posts WHERE `post_parent` = '$post_id' AND post_type = 'attachment' LIMIT 1" ;
    $result2=mysql_query($sql2) or die (mysql_error());
	while ($var2 = mysql_fetch_array($result2) ) {

		$ID = $var2['ID'];
		print 'ID : '.$ID.'<p></p>';

		$sql3="UPDATE wp_postmeta SET meta_value = '$ID' WHERE meta_id = '$meta_id' AND `meta_key` LIKE '_thumbnail_id'";
		print ''.$sql3.'<p></p>';
		mysql_query($sql3);	



	}
	echo '<hr>';
 	

	}