[PDF] NHibernate 4x Cookbook - Second Edition - Blackball

What is NHibernate in Java?

NHibernate is an Object Relational Mapping ORM Framework. NHibernate locates between database and business layer and provides powerful mapping. It inherits from Hibernate from the Java world. It uses mapping file or attributes besides properties.

Does NHibernate support XML mappings?

Note that, even though many NHibernate users choose to define XML mappings by hand, a number of tools ex- ist to generate the mapping document, even transparently at runtime.

What are the types of O/R mapping in NHibernate?

Basic O/R Mapping NHibernate 5.3 50 Version may be of typeInt64,Int32,Int16,Ticks,Timestamp,TimeSpan,datetimeoffset, ... (or their nul- lable counterparts in .NET 2.0 and higher). Any type implementingIVersionTypeis usable as a version. 5.1.9. timestamp (optional) The optional element indicates that the table contains timestamped data.

Can NHibernate map a polymorphic inheritance hierarchy?

In NHibernate, it is not absolutely necessary to explicitly map such inheritance hierarchies. You can simply map each class with a separate declaration. However, if you wish use polymorphic associations (e.g. an association to the superclass of your hierarchy), you need to use the mapping.