[ic] SQL query error

[ffire]

Hi,

I got the following error in my error.log when I attempted to run an 
sql query:

------------------------------------------------------------------------------------------
trial /store/trial/ord/receipt.html Bad SQL statement: Parse error 
near <WPDISPLAY ITEM=cartId>
     at /usr/local/interchange/lib/Vend/Scan.pm line 585.

Query was: update transactions set wp_payment_status = 'Success' 
where code = <WPDISPLAY ITEM=cartId>
------------------------------------------------------------------------------------------

This happened after making a payment to WorldPay, in my WorldPay 
callback script,

where 
<WPDISPLAY ITEM=cartId> 	
is the code of the transaction, returned by WorldPay, which got its 
value after my Checkout page.

When I attempt to print <WPDISPLAY ITEM=cartId> out, its value is 
shown correctly on the html page, eg, 1234.  

I just wonder why when used inside the SQL query, that piece of 
WorldPay code doesn't get interpreted.  Any idea what the problem 
could be?  I'll be grateful for any pointers!