我想優(yōu)化只讀查詢，所以我想在事務(wù)之外執(zhí)行 JPQL 查詢，以便從 JPQL 返回的實體不會在當(dāng)前持久性上下文中進行管理（為了節(jié)省臟檢查和不必要的管理這些實體的成本，以節(jié)省 2 倍的大?。┰诔志眯陨舷挛闹校Ｎ以谙旅鎳L試過，@Repositorypublic class CustomPostRepository {  @Autowired  private EmployeeRepository employeeRepository;  @Transactional  public void foo() {      // Some other transactional code (read-write) here ...      final TransactionStatus transactionStatus = TransactionAspectSupport.currentTransactionStatus(); // returns current active transaction      System.out.println("transactionStatus.isNewTransaction() = " + transactionStatus.isNewTransaction()); // returns TRUE      List<Post> posts = employeeRepository.bar();     // Some other code here...  }}@Repositorypublic class CustomJpaEmployeeDao implements EmployeeRepository {    @PersistenceContext    private EntityManager em;    @Override    @Transactional(propagation = Propagation.NOT_SUPPORTED)    public List<Post> bar() {        // Ideally this method should throw Exception, as transaction is expected to be suspended (not exists here)        final TransactionStatus transactionStatus = TransactionAspectSupport.currentTransactionStatus();        final List<Post> post = em.createNamedQuery("Post.findAllForReporing", Post.class).getResultList();        System.out.println("entityManager.contains(post) = " + em.contains(post.get(0))); // returns true, which should be false        return post;    }}呼叫者，@Testpublic void jpqlTest() {    customPostRepository.foo();}我想EmployeeRepository#bar在事務(wù)之外執(zhí)行（由 C 創(chuàng)建ustomPostRepository#bar），但Propagation.NOT_SUPPORTED不起作用，并且來自 JPQL 的所有選定實體都在當(dāng)前持久性上下文中進行管理。那么，有什么方法可以避免管理這些實體或在事務(wù)之外執(zhí)行代碼呢？或者這里缺少什么？