[Zope] SQL query in ZSQLMethod

Hi, In ZSQLMethod I would have SQL query similar to this logic: IF value1=<dtml-var value1> and value2=<dtml-var value2> THEN update table set( name='<dtml-var name>' )where value1=<dtml-var value1> and value2=<dtml-var value2> ELSE insert into table values( Id, name='<dtml-var name>', value1=<dtml-var value1>, value2=<dtml-var value2> ) I can't figure out how to change this notation. Many greetings and thanks for every answer!