Java Spring事务管理@Transactional行为

我想知道Spring@Transactional将如何用于以下编码场景。在这个示例中，我将Spring4+Hibernate5与Oracle 19C数据库一起使用

示例1:

@Service
public class UserService {
    @Transactional(readOnly = true)
    public void invoice() {
        createPdf();
        // send invoice as email, etc.
    }
    @Transactional(propagation = Propagation.REQUIRES_NEW)
    public void createPdf() {
        // ...
    }
}

@Service
public class UserService {
    @Autowired
    private InvoiceService invoiceService;
    @Transactional(readOnly = true)
    public void invoice() {
        invoiceService.createPdf();
        // send invoice as email, etc.
    }
}
@Service
public class InvoiceService {
    @Transactional(propagation = Propagation.REQUIRES_NEW)
    public void createPdf() {
        // ...
    }
}

示例2:

@Service
public class UserService {
    @Transactional(readOnly = true)
    public void invoice() {
        createPdf();
        // send invoice as email, etc.
    }
    @Transactional(propagation = Propagation.REQUIRES_NEW)
    public void createPdf() {
        // ...
    }
}

@Service
public class UserService {
    @Autowired
    private InvoiceService invoiceService;
    @Transactional(readOnly = true)
    public void invoice() {
        invoiceService.createPdf();
        // send invoice as email, etc.
    }
}
@Service
public class InvoiceService {
    @Transactional(propagation = Propagation.REQUIRES_NEW)
    public void createPdf() {
        // ...
    }
}

---

谢谢

示例1：当您从服务内部调用createPDF方法时，@Transactional（REQUIRES_NEW）注释将被有效地忽略。不会有新的交易打开

示例2：当您正在调用另一个服务时（该服务包装在事务代理中），您将得到一个

新事务，因为注释是受尊重的

您可能还想阅读本文：
第一个被称为self-call，它不经过
TransactionInterceptor
（它只是使用
this
而不是Spring事务包装器对象），因此
createPdf（）
上的
@Transactional
基本上不存在。