2/29/2024 0 Comments Hibernate annotations versionWith OptimisticLockType.DIRTY only the dirty/changed fields (in our case model) would be part of the SQL statement UPDATE CAR SET MODEL = ?, BRAND = ? WHERE ID = ? AND MODEL = ? If the Car instance would have been changed in the meantime and the UPDATE would not find a row, a StaleStateException or an OptimisticLockException is going be thrown. With OptimisticLockType.ALL the generated SQL statement would be UPDATE CAR SET MODEL = ?, BRAND = ? WHERE ID = ? AND MODEL = ? AND BRAND = ?Īll columns of the associated database row are used in the WHERE clause. setModel ( "Punto" ) car = carRepository. Let us consider we have an already persisted Car instance and we would change property model Car car = carRepository. import import ( type = OptimisticLockType. By applying the annotation on type level you can define the style of optimistic locking to be applied to a JPA entity. Optimistic locking with Hibernate is commonly implemented by applying the annotation to a version instance variable resulting in a VERSION column with either a numberic value or a timestamp (depending on the declared type of the instance variable).Īlthough this is sufficient in many situations, Hibernate does provide alternative locking strategies too. It can be used to lower the risk of optimistic locking exceptions. Versionless optimistic locking is an alternative to using JPA’s annotation with a numeric or timestamp column. This article is about a Hibernate feature called versionless optimistic locking.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |