2013/8/29 Michael Van Canneyt <mich...@freepascal.org> > On Thu, 29 Aug 2013, silvioprog wrote: > > >> Other interesting feature is the property EmptyAsNull: >> >> http://docwiki.embarcadero.**com/VCL/XE/en/IBCustomDataSet.** >> TIBStringField.EmptyAsNull<http://docwiki.embarcadero.com/VCL/XE/en/IBCustomDataSet.TIBStringField.EmptyAsNull> >> >> It tests if field (ftString) is empty (f = ''), if yes, it set the field >> value to null (f.Clear). >> > > Apparently a IBX specific extension. > > I don't see the value of this. empty and null are different things. > > Michael.
Some Delphi components (Zeos, JvDBEdit) have this option. Assuming this table: test id integer, name varchar(10) not null unique You can: id|name 1| <null> 2| <null> But: 1| <empty> 2| <empty> << error, unique key I implemented "EmptyAsNull" directly in my project. It is very useful. In my webpages, if the user clear a input, I send a null value to the table. -- Silvio Clécio My public projects - github.com/silvioprog
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