[Zope] manage_addDTMLMethod vs. manage_addZSQLMethod

[Hannu Krosing]

Why does this work

<dtml-call "_['testadd'].manage_addDTMLMethod('MethodId', 'Method
Title','method text')">


While this does not:

<dtml-call "_['testadd'].manage_addZSQLMethod('DB', 'DB',
'DB','DB','DB')">

(the database connection DB is there)

I studies the Znolk product and found that it uses _setObject directly
instead of 
manage_addZSQLMethod .

Should I just wrap _setObject into an external method (to make it
visible) and start using 
it or is there a simpler way ?

-------------
Hannu