[Zope-DB] Building SQL on the fly?

[VanL]

Hello,

I have read through all of the documentation that I can find, but I 
can't see how to represent some needed SQL queries.  For example, having 
a variable number of parameters:

bugvalue=[]

SELECT apples_harvested FROM appletrees
    <dtml-if bugvalue>
    WHERE has_bugs NOT IN (<dtml-in bugvalue><dtml-sqlvar 
sequence-item>,</dtml-in>)
    </dtml-if>

So you could call it with the following query string:

/SQLgetAppleHarvest?bugvalue:tokens=yes%20maybe

and have it execute the following SQL:

SELECT apples_harvested FROM appletrees
    WHERE has_bugs NOT IN ('yes','maybe');

whereas a query string:
/SQLgetAppleHarvest

would execute
SELECT apples_harvested FROM appletrees;

Does anyone know how to build these sort of queries on the fly?

Thanks,

VanL