Transient, persistent, transactional, and XA messaging.
瞬态、持久性、事务性和xa消息传递。
By default, all fields are persistent in JPA; however, you can mark a field as transient, and then you can derive any field using logic. Below, a query is executed to derive a field.
缺省情况下，所有字段在JPA中都是持久性的；但是，您可以将一个字段标注为瞬态的，然后可以使用逻辑派生任何字段。
Review how to join transient and persistent XML data as well as how to update specific portions of persistent XML documents.
复习如何联接瞬时和永久xml数据，以及如何更新永久XML文档的特定部分。
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