事物的七种传播行为
事务传播行为类型
事务传播行为类型 |
说明 |
PROPAGATION_REQUIRED |
如果当前没有事务,就新建一个事务,如果已经存在一个事务中,加入到这个事务中。这是最常见的选择。 |
PROPAGATION_SUPPORTS |
支持当前事务,如果当前没有事务,就以非事务方式执行。 |
PROPAGATION_MANDATORY |
使用当前的事务,如果当前没有事务,就抛出异常。 |
PROPAGATION_REQUIRES_NEW |
新建事务,如果当前存在事务,把当前事务挂起。 |
PROPAGATION_NOT_SUPPORTED |
以非事务方式执行操作,如果当前存在事务,就把当前事务挂起。 |
PROPAGATION_NEVER |
以非事务方式执行,如果当前存在事务,则抛出异常。 |
PROPAGATION_NESTED |
如果当前存在事务,则在嵌套事务内执行。如果当前没有事务,则执行与PROPAGATION_REQUIRED类 似的操作。
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罗列了7种spring的事务传播行为,我们具体来看看它的实现。在这里,我们使用spring annotation注解实现事务。
实现事务的类BusinessServiceImpl
package com.aop; import org.springframework.aop.support.AopUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Isolation; import org.springframework.transaction.annotation.Propagation; import org.springframework.transaction.annotation.Transactional; import com.entity.Student; @Service("businessSerivce") public class BusinessServiceImpl implements IBaseService { @Autowired IStudentDao studentDao; @Autowired IBaseServiceB baseServiceb; @Transactional(propagation = Propagation.REQUIRED, isolation = Isolation.DEFAULT, rollbackFor = Exception.class) public String doA() throws Exception { Student st = new Student(); st.setId(1); st.setSex("girl"); st.setUsername("zx"); studentDao.insertStudent(st); System.out.println(baseServiceb); System.out.println("是否是代理调用,AopUtils.isAopProxy(baseServiceb) : " + AopUtils.isAopProxy(baseServiceb)); System.out .println("是否是cglib类代理调用,AopUtils.isCglibProxy(baseServiceb) : " + AopUtils.isCglibProxy(baseServiceb)); System.out.println("是否是jdk动态接口代理调用,AopUtils.isJdkDynamicProxy(baseServiceb) : " + AopUtils.isJdkDynamicProxy(baseServiceb)); //使用代理调用方法doB() baseServiceb.doB(); int i = 1 / 0;// 抛出异常,doB()的事务事务回滚 return "success"; } // @Transactional(propagation = Propagation.REQUIRES_NEW, isolation = // Isolation.DEFAULT, rollbackFor = Exception.class) // public String doB() throws Exception { // Student st = new Student(); // st.setId(2); // st.setSex("girl"); // st.setUsername("zx2"); // studentDao.insertStudent(st); // // return "success"; // } }
实现事务的类BusinessServiceImpl
package com.aop; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Isolation; import org.springframework.transaction.annotation.Propagation; import org.springframework.transaction.annotation.Transactional; import com.entity.Student; @Service("businessSerivceB") public class BusinessServiceImplB implements IBaseServiceB { @Autowired IStudentDao studentDao; @Transactional(propagation = Propagation.REQUIRES_NEW,isolation=Isolation.DEFAULT,rollbackFor=Exception.class) public String doB() throws Exception { Student st = new Student(); st.setId(2); st.setSex("girl"); st.setUsername("zx2"); studentDao.insertStudent(st); return "success"; } }
测试类:
package com.aop; import org.springframework.beans.factory.BeanFactory; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.thread.service.IBaseFacadeService; //@RunWith(SpringJUnit4ClassRunner.class) //@ContextConfiguration(locations = { "classpath:/spring-ibatis.xml", "classpath:/spring-jdbctemplate.xml" }) public class TestStudentDao { public static void main(String[] args) { try { BeanFactory factory = new ClassPathXmlApplicationContext("spring-jdbctemplate.xml"); IBaseService service = (IBaseService) factory.getBean("businessSerivce"); service.doA(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
测试结果:
om.aop.BusinessServiceImplB@14b75fd9
是否是代理调用,AopUtils.isAopProxy(baseServiceb) : true
是否是cglib类代理调用,AopUtils.isCglibProxy(baseServiceb) : true
是否是jdk动态接口代理调用,AopUtils.isJdkDynamicProxy(baseServiceb) : false
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