2013/8/30 Michael Van Canneyt <mich...@freepascal.org> > On Fri, 30 Aug 2013, silvioprog wrote: > > 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. >> > > Good for you :) > > Michael.
hehe... :D -- Silvio Clécio My public projects - github.com/silvioprog
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