1. 事务的传播
REQUIRED(必须的)(TransactionDefinition.PROPAGATION_REQUIRED)
使用当前的事务,如果当前没有事务,则自己新建一个事务,子方法是必须运行在一个事务中的,如果当前存在事务,则加入这个事务,成为一个整体。
例如:领导没有钱,但是我有钱,我就会自己买了吃(不存在事务); 如果领导有钱,就会分一些给我(事务);
SUPPORTS(支持)(TransactionDefinition.PROPAGATION_SUPPORTS)
如果当前有事务,则使用事务,如果没有,则不使用。
例如:领导没饭吃,我也没饭吃,领导有饭吃,我也有饭吃,也就是说如下面的代码,我在savechild()方法上加了事务,但是在父级方法中没有加,则不会有事务,如果我在父级方法中也加了事务,才会实现事务。
@Transactional(propagation = Propagation.REQUIRED)
@Test
public void saveParent(){
stuService.saveParent();
stuService.saveChild();
}
//当propagation = Propagation.SUPPORTS时,单独加这个事务,在调用过程中是不起作用的
@Transactional(propagation = Propagation.SUPPORTS)
@Override
public void saveChild() {
saveChild1();
int s = 1/0;
saveChild2();
}
public void saveChild1(){
Stu stu = new Stu();
stu.setAge(23);
stu.setName("child1");
}
public void saveChild2(){
Stu stu = new Stu();
stu.setAge(23);
stu.setName("child2");
}
MANDATORY(强制的)(TransactionDefinition.PROPAGATION_MANDATORY)
这个则会强制要求父级调用者添加事务,否则会报如下错误;
例如 :领导必须管饭,不管饭我就不干了
org.springframework.transaction.IllegalTransactionStateException: No existing transaction found for transaction marked with propagation 'mandatory'
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:364)
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:475)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:289)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
at com.imooc.service.impl.StuServiceImpl$$EnhancerBySpringCGLIB$$ab72f9f8.saveChild(<generated>)
at com.imooc.TranTest.saveParent(TranTest.java:33)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)
REQUIRES_NEW(必须创建新的)(TransactionDefinition.PROPAGATION_REQUIRES_NEW)
如果当前有事务,则挂起该事务,并且创建一个新的事务给自己用。如果当前没有事务,则同REQUIRED
。
NOT_SUPPORTED(TransactionDefinition.PROPAGATION_NOT_SUPPORTED)
如果当前有事务,则把该事务挂起,自己不执行。
NOT_SUPPORTED(TransactionDefinition.PROPAGATION_NOT_SUPPORTED)
调用方不允许有任何的事务。
NESTED(TransactionDefinition.PROPAGATION_NESTED)
调用方发生异常,子事务也会受影响回滚。子事务 发生异常,则也会回滚,但是,如果我们给被调用方加上trycatch的话,则就算被调用方发生了异常,也不会影响调用方的执行。