Java playframework hibernate不可变实体和通过合并更改版本
我想确保Java playframework hibernate不可变实体和通过合并更改版本,java,hibernate,playframework,persistence,immutability,Java,Hibernate,Playframework,Persistence,Immutability,我想确保 我可以在Hibernate中使用/拥有不可变实体(使用play framework) 这种乐观的策略适用于我的实体(版本正在更改),当我将它们保存/标记回数据库时 有一个测试: @Test public void test() { // create question->answer and save them to db QuestionUtil.createQuestion("question1", "answer1");
@Test
public void test() {
// create question->answer and save them to db
QuestionUtil.createQuestion("question1", "answer1");
// detaching question from the hibernate session, let user to think and play with entity
Question question1 = Question.find("title", "question1").first();
Question.em().detach(question1);
// user think/edit time ... [1 minute.. 2 minutes.. coffee.. break time.. ]
// user makes some edits in detached question, create new fresh copy (since it's immutable)
Question editingQuestion = new Question.Builder().copy(question1).title("updated question1").build();
editingQuestion.merge();
// get updated Question
Question updatedQuestion = Question.find("title", "question1").first();
assertEquals(updatedQuestion.getTitle(), "updated question1"); // OK
assertTrue(updatedQuestion .getVersion().intValue() == 1); // FAILS here
}
问题。为什么版本不增加为1(而不是0)?一般来说,有没有更好的方法
问题课的负责人在这里:
@Entity
public class Question extends GenericModel {
@Version
private Integer version;
...
在找到更新问题之前,是否尝试刷新实体管理器?我猜Hibernate还没有向数据库写入任何内容,因此还没有更新版本。我尝试使用这种技术:按事务包装调用。但是,这对db来说并不安全,不同的测试失败(即“OK测试”失败)Question.em().flush();这也于事无补