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
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.
_______________________________________________
fpc-pascal maillist - fpc-pascal@lists.freepascal.org
http://lists.freepascal.org/mailman/listinfo/fpc-pascal
