Firebird set field to Null

[slai]

hy everybody

i've got a problem with setting a Date field to Null.
How can i do that with.

Code: Select all

ZTable.Edit;
ZTable.FieldByName('DateField').As....... := Null?
ZTable.CommitUpdates;

I don't want to exec a query!

Thanks for replys

[slai]

ZTable.FieldByName('DateField').clear;