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improve section on versions

This commit is contained in:
Gavin 2023-05-18 11:20:56 +02:00
parent bb1f5bf8e3
commit 15422ea13b
1 changed files with 4 additions and 2 deletions
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documentation/src/main/asciidoc/introduction/Entities.adoc
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@ -448,7 +448,7 @@ Book book = session.find(Book.class, new BookId(isbn, printing));
=== Version attributes
An entity may have an attribute which is used by Hibernate for optimistic lock checking.
A version attribute is usually of type `Integer` or `LocalDateTime`, though several other types are also allowed.
A version attribute is usually of type `Integer`, `Short`, `Long`, `LocalDateTime`, `OffsetDateTime`, `ZonedDateTime`, or `Instant`.
[source,java]
----
@ -456,7 +456,7 @@ A version attribute is usually of type `Integer` or `LocalDateTime`, though seve
LocalDateTime lastUpdated;
----
The `@Id` and `@Version` attributes we've already seen are just specialized examples of _basic attributes_.
Version attributes are automatically assigned by Hibernate when an entity is made persistent, and automatically incremented or updated each time the entity is updated.
[TIP]
// .Optimistic locking in Hibernate
@ -466,6 +466,8 @@ The `@OptimisticLocking` annotation lets us specify that optimistic locks should
And the `@OptimisticLock` annotation lets us selectively exclude certain fields from optimistic locking.
====
The `@Id` and `@Version` attributes we've already seen are just specialized examples of _basic attributes_.
[[natural-id-attributes]]
=== Natural id attributes