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Anyone know of some good tutorials on how to create a custom ID generator for hibernate?
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A generator class is used to generate an ID for an object, which is going to be inserted in the database as a primary key. The ID is a unique identifier for the objects of the persistent class. We can use any generator classes in our application as per our requirements.
Yes, hibernate requires an Id. Sometimes if you are dealing with a legacy database that for whatever reason does not have a key, you can define the key in Hibernate to be a composite key of all the columns for example, as this will be guaranteed to be unique.
SEQUENCE is the generation type recommended by the Hibernate documentation. The generated values are unique per sequence. If we don't specify a sequence name, Hibernate will reuse the same hibernate_sequence for different types.
id. new_generator_mappings that directs how identity or sequence columns are generated when using @GeneratedValue . In JBoss EAP 6, the default value for this property is set as follows: When you deploy a native Hibernate application, the default value is false .
A cursory search of Google for 'hibernate custom id generator tutorial' turned up the following possibilities. I've excluded those that don't look useful and summarized the content of each.
Hope that helps.
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http://resource.visual-paradigm.com/vpsuite2.3sp1/custom_id_generator.html
Though this link demonstrates Visual-Paradigm tool for generating Custom ID generator, but the idea of Hibernate Custom ID generator can be learnt from the same
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