Description:
------------
There is no documented way to escape a colon in PDO.  I understand that there may be a new patch to make this optional, however, I would not like to use the bindParam function, I would just like to escape it outright.  no number of backslashes seem to work.  This bug hints at the problem, however, there is no note on how to escape a : (colon): http://bugs.php.net/bug.php?id=33736&edit=2

Reproduce code:
---------------
// basically just an update on a time field
$sql_query_str = "UPDATE _sif_message_queue SET msg_time_remote='10:53:00' WHERE message_queue_id=".$this->message_queue_id;
			$stmt = $appconnection->prepare($sql_query_str);
			$stmt->execute();

Expected result:
----------------
Query executes successfully

Actual result:
--------------
SQLSTATE[HY093]: Invalid parameter number: no parameters were bound