PL/TCL and NULL values

Hi,

I created this trigger to implement templates for a fields in a table.
This works except if fieldvalue in template is NULL. In that case, the field is
excluded in the array and the "set" directive fails.

How can I copy NULL values from TPL to NEW array ?
I think I should test if the value is the array and avoid to execute the set
directive if not, but I'm totally a newbie with TCL. Please help ! :^)

CREATE FUNCTION users_trig_func() RETURNS opaque AS ' spi_exec -array TPL "SELECT * FROM $1 WHERE template=
\'$NEW(template)\'AND
 
force=\'f\'" {   set NEW($TPL(fieldname)) $TPL(fieldvalue)  }
 return [array get NEW]
' LANGUAGE 'pltcl';

Thanks in advance.

Bye!

-- Daniele

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