¿Qué es el identificador natural?

What is natural identifier?

In the real world, most objects have a natural identifier. A natural identifier nevertheless identifies a database record and an object in the real world. A lot of use cases use them instead of an artificial, surrogate key. It is, therefore, good practice to model them as unique keys in your database.

Natural id fetching Hibernate allows you to fetch entities either directly, via the entity identifier, or through a JPQL or SQL query. Just like with the JPA @Id annotation, the @NaturalId allows you to fetch the entity if you know the associated natural key.

Natural identifier (also known as business key): is an identifier that means or represent something in real life. Email or national id for person. Isbn for Book. IBAN for Bank account. This @NaturalId Annotation is used to specify Natural identifier.

Natural Ids. Natural ids represent domain model unique identifiers that have a meaning in the real world too. Even if a natural id does not make a good primary key (surrogate keys being usually preferred), it’s still useful to tell Hibernate about it.

A natural key is a column or set of columns that already exist in the table (e.g. they are attributes of the entity within the data model) and uniquely identify a record in the table. Since these columns are attributes of the entity they obviously have business meaning.

Implementors manage transactional access to cached data. A transaction-aware cache implementation might be wrapped by a “synchronous” concurrency strategy, where updates to the cache are written to the cache inside the transaction.

Di National Identity Management Commission ask Nigerians to use dial *346# to retrieve dia NIN number.

The identity number is printed on all of your national identification documents, such as your ID-card, passport, residents permit etc. It is usually either next to or below your name or your birth date.

They are keys that don’t have a natural relationship with the rest of the columns in a table. The surrogate key is just a value that is generated and then stored with the rest of the columns in a record. Some say you should always use a natural key and the others say a surrogate key is best.

We have following types of keys in SQL which are used to fetch records from tables and to make relationship among tables or views.

• Super Key.
• Candidate Key.
• Primary Key.
• Alternate key.
• Composite/Compound Key.
• Unique Key.
• Foreign Key.

By default, Hibernate stores each entity class an individual region of the 2nd level cache. It uses the fully qualified class name as the region name. Ehcache maps each region to a separate cache. You can configure each one of them in the ehcache.