Radu Preotiuc-Pietro wrote:
XMLSchema, as databases, makes a distiction between values "not present" and values "present, but set to
null" that Java doesn't make (in addition to the distinction between "null" and "empty").
Radu, I don't quite follow what you mean with "as databases"
What difference does a database make between "values not present" and
"values present but set to null" ?
I always thought that setting a value to null is saying "the value is
not present" ?
create table tab (a number, b varchar(10));
// value no present
insert into tab (a) values (1);
// value set to null
insert into tab (a,b) values (1, null);
How can I make distinction between these two rows ?
On a sidenote: Oracle doesn't even make distinction between empty
string and null, don't know about other databases though.
Maarten
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