For example:
Define an entity class "User":

private Long id;//primary key
private String name;
private String address;

I use session.update to update the attached entity sourced from a web form . when the property "address" value is null, I need Hibernate does not update the field into database.
So hibernate suppports the strategy? Please help me, thanks!

in database set default as null. in hebernate programming not update it (simply leave it)