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The <generator> class is a sub-element of id. It is used to generate the unique identifier for the objects of persistent class. There are many generator classes defined in the Hibernate Framework.

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Jul 19, 2010  NHibernate Mapping Generator. A simple utility to generate NHibernate mapping files and corresponding domain classes from existing DB tables. Features: Supports Oracle, SqlServer, PostgreSQL, MySQL, SQLite, Sybase, Ingres, CUBRID; Can generate hbm.xml, Fluent NHibernate and NH 3.3 Fluent style of mapping files. NHibernate - Relational Persistence for Idiomatic.NET. Getting started with NHibernate 1.2. First persistent class. Composite key example. Jan 31, 2012 Nhibernate Get on Composite key Jan 31 by manishdalal2 If you have an entity that uses a composite key but you aren’t sure how to retrieve it using the session.Get or session.Load then I’m going to show you how. Feb 09, 2011 In our project, we’re sub classing multiple domain classes from a single Reference Data table – i.e. Volume and Weight types. Among other things, the reference data table contains discriminator, code and value columns. The ‘discriminator’ column stores the name of the class and is used by Fluent NHibernate to determine which subclass to instantiate, the ‘value’ column is the full. Jul 14, 2011  This is part of a series of posts about NHibernate Pitfalls. See the entire collection here. At times, there may be a need for entities with composite identifiers, that is, entities that map to tables which have composite primary keys, composed of many columns. Key Column Name AttributeDefId, ObjectDefId We will then generate suitable composite mappings in XML or Fluent NHibernate as required. The nightly build will be available from about 1200 GMT and you will be able to get it from the Downloads page. Let us know how it goes! When I was integrating NHibernate into an existing enterprise software with a legacy database, it took me some time to figure out how mappings for composite keys with associations between entities should be set.

All the generator classes implements the org.hibernate.id.IdentifierGenerator interface. The application programmer may create one's own generator classes by implementing the IdentifierGenerator interface. Hibernate framework provides many built-in generator classes:

1. assigned
2. increment
3. sequence
4. hilo
5. native
6. identity
7. seqhilo
8. uuid
9. guid
10. select
11. foreign
12. sequence-identity

1) assigned

It is the default generator strategy if there is no <generator> element . In this case, application assigns the id. For example:

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2) increment

It generates the unique id only if no other process is inserting data into this table. It generates short, int or long type identifier. If a table contains an identifier then the application considers its maximum value else the application consider that the first generated identifier is 1. For each attribute value, the hibernate increment the identifier by 1. Syntax:

3) sequence

It uses the sequence of the database. if there is no sequence defined, it creates a sequence automatically e.g. in case of Oracle database, it creates a sequence named HIBERNATE_SEQUENCE. In case of Oracle, DB2, SAP DB, Postgre SQL or McKoi, it uses sequence but it uses generator in interbase. Syntax:

For defining your own sequence, use the param subelement of generator.

4) hilo

It uses high and low algorithm to generate the id of type short, int and long. Syntax:

5) native

It uses identity, sequence or hilo depending on the database vendor. Syntax:

6) identity

Fluent Nhibernate Composite Key Generator Download

Windows 7 product key generator 2018. It is used in Sybase, My SQL, MS SQL Server, DB2 and HypersonicSQL to support the id column. The returned id is of type short, int or long. It is responsibility of database to generate unique identifier.

7) seqhilo

It uses high and low algorithm on the specified sequence name. The returned id is of type short, int or long.

8) uuid

It uses 128-bit UUID algorithm to generate the id. The returned id is of type String, unique within a network (because IP is used). The UUID is represented in hexadecimal digits, 32 in length.

9) guid

10) select

11) foreign

12) sequence-identity