@Transactional传播属性_随笔

@Transactional传播属性 required有则有无则创建（默认）

说明：如果当前已经存在事务，那么加入该事务，如果不存在事务，创建一个事务，这是默认的传播属性值。

@Service
public class RequireMethodService {

	@Autowired
	UserService userService;

	@Transactional(propagation = Propagation.REQUIRED)
	public void methodSon1() {
		User user = new User();
		user.setId(1);
		user.setUserName("A");
		userService.save(user);
		String act = TransactionSynchronizationManager.getCurrentTransactionName();
		System.out.println("Transaction1-----" + act);
	}

	@Transactional(propagation = Propagation.REQUIRED)
	public void methodSon2() {
		User user = new User();
		user.setId(2);
		user.setUserName("B");
		userService.save(user);
		String act = TransactionSynchronizationManager.getCurrentTransactionName();
		System.out.println("Transaction2-----" + act);
	}

}

@Service
public class RequireService {

	@Autowired
	RequireMethodService requireMethodService;
	
	@Transactional
    public void service() {
		String act = TransactionSynchronizationManager.getCurrentTransactionName();
		System.out.println("begin-----" + act);
		requireMethodService.methodSon1();
		requireMethodService.methodSon2();
    } 
    
}

执行结果：事务是相同的

begin-----com.cn.service.propagation.require.RequireService.service
Transaction1-----com.cn.service.propagation.require.RequireService.service
Transaction2-----com.cn.service.propagation.require.RequireService.service

supports有则有无则无事务

如果当前已经存在事务，那么加入该事务，否则创建一个所谓的空事务（可以认为无事务执行）。

@Service
public class SupportMethodService {

	@Autowired
	UserService userService;

	
	@Transactional(propagation = Propagation.SUPPORTS)
	public void methodSon1() {
		User user = new User();
		user.setId(1);
		user.setUserName("A");
		userService.save(user);
		throw new RuntimeException("异常");
	}


}

@Service
public class SupportService {

	@Autowired
	SupportMethodService supportMethodService;
	
	
	@Transactional
    public void service() {
		supportMethodService.methodSon1();
		
    } 
    
}

执行结果：
SupportService在调用SupportMethodService的过程中
1. SupportService没有事务，则methodSon1也没有事务，不会回滚，数据插入到数据库。
2. SupportService有事务，则methodSon1加入到事务中，会回滚。

mandatory必须有事务

当前必须存在一个事务，否则抛出异常。

@Service
public class MandatoryMethodService {

	@Autowired
	UserService userService;

	@Transactional(propagation = Propagation.MANDATORY)
	public void methodSon1() {
		User user = new User();
		user.setId(1);
		user.setUserName("A");
		userService.save(user);
	}

	@Transactional(propagation = Propagation.MANDATORY)
	public void methodSon2() {
		User user = new User();
		user.setId(2);
		user.setUserName("B");
		userService.save(user);
	}
	

}

@Service
public class MandatoryService {

	@Autowired
	MandatoryMethodService mandatoryMethodService;
	
	
//	@Transactional
    public void service() {
		//没有事务
		mandatoryMethodService.methodSon1();
    } 
    
}

执行结果：

org.springframework.transaction.IllegalTransactionStateException: No existing transaction found for transaction marked with propagation 'mandatory'
	at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:362) ~[spring-tx-5.3.6.jar:5.3.6]
	at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:595) ~[spring-tx-5.3.6.jar:5.3.6]
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:382) ~[spring-tx-5.3.6.jar:5.3.6]
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.6.jar:5.3.6]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.6.jar:5.3.6]
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:750) ~[spring-aop-5.3.6.jar:5.3.6]
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:692) ~[spring-aop-5.3.6.jar:5.3.6]

never 必须没有事务

如果当前存在事务，则抛出异常

@Service
public class NeverMethodService {

	@Autowired
	UserService userService;

	@Transactional(propagation = Propagation.REQUIRED)
	public void methodSon1() {
		User user = new User();
		user.setId(1);
		user.setUserName("A");
		userService.save(user);
	}

	@Transactional(propagation = Propagation.NEVER)
	public void methodSon2() {
		User user = new User();
		user.setId(2);
		user.setUserName("B");
		userService.save(user);
	}
	

}

@Service
public class NeverService {

	@Autowired
	NeverMethodService neverMethodService;
	
	
	@Transactional
    public void service() {
		//methodSon1创建了事务,但不会影响methodSon2
    	neverMethodService.methodSon1();
    	//methodSon2此时会报错，因为service()上已经开启了事务
    	neverMethodService.methodSon2();
    } 
    
}

执行结果：

org.springframework.transaction.IllegalTransactionStateException: Existing transaction found for transaction marked with propagation 'never'
	at org.springframework.transaction.support.AbstractPlatformTransactionManager.handleExistingTransaction(AbstractPlatformTransactionManager.java:413) ~[spring-tx-5.3.6.jar:5.3.6]
	at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:352) ~[spring-tx-5.3.6.jar:5.3.6]
	at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:595) ~[spring-tx-5.3.6.jar:5.3.6]
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:382) ~[spring-tx-5.3.6.jar:5.3.6]
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.6.jar:5.3.6]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.6.jar:5.3.6]
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:750) ~[spring-aop-5.3.6.jar:5.3.6]
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:692) ~[spring-aop-5.3.6.jar:5.3.6]

requires_new新事务

REQUIRES_NEW新建一个事务，不管当前有没有事务，都新建一个独立的事务。

@Service
public class RequireNewMethodService {

	@Autowired
	UserService userService;

	@Transactional(propagation = Propagation.REQUIRED)
	public void methodSon1() {
		User user = new User();
		user.setId(1);
		user.setUserName("A");
		userService.save(user);
		String act = TransactionSynchronizationManager.getCurrentTransactionName();
		System.out.println("Transaction1-----" + act);
	}

	@Transactional(propagation = Propagation.REQUIRES_NEW)
	public void methodSon2() {
		User user = new User();
		user.setId(2);
		user.setUserName("B");
		userService.save(user);
		String act = TransactionSynchronizationManager.getCurrentTransactionName();
		System.out.println("Transaction2-----" + act);
	}


}

@Service
public class RequireNewService {

	@Autowired
	RequireNewMethodService requireNewMethodService;
	
	
	@Transactional
    public void service() {
		String act = TransactionSynchronizationManager.getCurrentTransactionName();
		System.out.println("begin-----" + act);
		requireNewMethodService.methodSon1();
		
		requireNewMethodService.methodSon2();
    } 
    
}

执行结果：

begin-----com.cn.service.propagation.requiresnew.RequireNewService.service
Transaction1-----com.cn.service.propagation.requiresnew.RequireNewService.service
Transaction2-----com.cn.service.propagation.requiresnew.RequireNewMethodService.methodSon2

nested嵌套事务

1）methodSon2方法内部报错，则只会回滚methodSon2里面的。

2）methodSon2方法内部不报错，但是外面的调用方报错了，则methodSon2会跟着一起回滚。

3）methodSon2方法内部不报错，外面也不报错，则methodSon2和外面事务一起提交。

@Service
public class NestedMethodService {

	@Autowired
	UserService userService;

	@Transactional(propagation = Propagation.REQUIRED)
	public void methodSon1() {
		User user = new User();
		user.setId(1);
		user.setUserName("A");
		userService.save(user);
	}

	@Transactional(propagation = Propagation.NESTED)
	public void methodSon2() {
		User user = new User();
		user.setId(2);
		user.setUserName("B");
		userService.save(user);
		throw new RuntimeException("methodSon2异常");
	}


}

@Service
public class NestedService {

	@Autowired
	NestedMethodService nestedMethodService;
	
	
	@Transactional
    public void service() {
		nestedMethodService.methodSon1();
		try {
			nestedMethodService.methodSon2();
        } catch (Exception e) {
            e.printStackTrace();
        }
    } 
	
	
	@Transactional
    public void service2() {
		try {
			nestedMethodService.methodSon1();
        } catch (Exception e) {
            e.printStackTrace();
        }
		nestedMethodService.methodSon2();
    } 
	
	
    
}

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@Transactional传播属性

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