java - JPA - 如何在 openjpa 中复制 Hibernate 的更新版本查询

Question

我正在尝试在 Openjpa 中复制 Hibernate 的“更新版本”行为:

em.createQuery("update versioned MyEntity m set m.otherEntity=null where m.otherEntity=:otherEntity).setParameter("otherEntity", otherEntity).executeUpdate();

我在 openjpa 中尝试了相同的查询，但我收到此查询的错误(它采用“版本化”作为别名)，因此它显然是 HQL 功能。

Answer 1

hibernate 规范:

In keeping with the EJB3 specification, HQL UPDATE statements, by default, do not effect the version or the timestamp property values for the affected entities. However, you can force Hibernate to reset the version or timestamp property values through the use of a versioned update. This is achieved by adding the VERSIONED keyword after the UPDATE keyword.

因此 HQL 可以选择使用更新版本来重置版本但是在 OpenJpa 中:

Bulk update maps directly to a database update operation, bypassing optimistic locking checks. Portable applications must manually update the value of the version column, if desired, and/or manually validate the value of the version column.