[Zope] optional sql tag

[Dieter Maurer]

Horvath Adam writes:
 > I have 3 select -> there are 3 form variable: year, month, 
 > day
 > which are arguments for the ZSQL Method:
 > 
 > select * from table c
 > <dtml-sqlgroup where>
 >   ...
 > <dtml-and>
 >   c.date >= <dtml-sqlvar "year+'-'+month+'-'+day" 
 > type=string>
 > <dtml-and>
 >   ...
 > </dtml-sqlgroup>
 > 
 > It works great, but when there is nothing in the form 
 > variables,
 > it will be  c.date >='--'
Use an "dtml-if" to check for the empty condition.


Dieter