Summary of @Transactional transaction invocation and effective scenarios

1. In the same class, transaction publicA drops non-transaction B, B throws an exception, and AB transaction takes effect (with propagation)

@[email protected] void A() {User u = new User();u.setAccount("test");u.setName("1");u.setMobile("12345678912");u.setPassword("111");this.save(u);B();}public void B() {User u1 = new User();u1.setAccount("test1");u1.setName("2");u1.setMobile("12345678913");u1.setPassword("111");this.save(u1);// trigger exceptionif(3/0==1)System.out.println("");}

2. In the same class, transaction A drops non-transaction B, A throws an exception, and AB transaction takes effect

@[email protected] void A() {User u = new User();u.setAccount("test");u.setName("1");u.setMobile("12345678912");u.setPassword("111");this.save(u);B();// trigger exceptionif(3/0==1)System.out.println("");}public void B() {User u1 = new User();u1.setAccount("test1");u1.setName("2");u1.setMobile("12345678913");u1.setPassword("111");this.save(u1);}

3. In the same class, transaction A drops transaction B, A throws an exception, and AB transaction takes effect

@[email protected] void A() {User u = new User();u.setAccount("test");u.setName("1");u.setMobile("12345678912");u.setPassword("111");this.save(u);B();// trigger exceptionif(3/0==1)System.out.println("");}@Transactionalpublic void B() {User u1 = new User();u1.setAccount("test1");u1.setName("2");u1.setMobile("12345678913");u1.setPassword("111");this.save(u1);}

4. In the same class, transaction A drops transaction B, B throws an exception, and AB transaction takes effect

@[email protected] void A() {User u = new User();u.setAccount("test");u.setName("1");u.setMobile("12345678912");u.setPassword("111");this.save(u);B();}@Transactionalpublic void B() {User u1 = new User();u1.setAccount("test1");u1.setName("2");u1.setMobile("12345678913");u1.setPassword("111");this.save(u1);// trigger exceptionif(3/0==1)System.out.println("");}

5. In the same class, non-transaction A drops transaction B, B throws an exception, A has no transaction, and B transaction does not take effect

@Overridepublic void A() {User u = new User();u.setAccount("test");u.setName("1");u.setMobile("12345678912");u.setPassword("111");this.save(u);B();}@Transactionalpublic void B() {User u1 = new User();u1.setAccount("test1");u1.setName("2");u1.setMobile("12345678913");u1.setPassword("111");this.save(u1);// trigger exceptionif(3/0==1)System.out.println("");}

6. In the same class, non-transaction A drops transaction B (through injection - equivalent to calling B method in different classes) B throws exception A has no transaction, B transaction takes effect

@Overridepublic void A() {User u = new User();u.setAccount("test");u.setName("1");u.setMobile("12345678912");u.setPassword("111");this.save(u);userService.B();}@[email protected] void B() {User u1 = new User();u1.setAccount("test1");u1.setName("2");u1.setMobile("12345678913");u1.setPassword("111");this.save(u1);// trigger exceptionif(3/0==1)System.out.println("");}

7. In the same class, non-transaction A drops transaction B (through injection), A throws exception, A has no transaction, B does not trigger transaction, and ab data will increase success

@Overridepublic void A() {User u = new User();u.setAccount("test");u.setName("1");u.setMobile("12345678912");u.setPassword("111");this.save(u);userService.B();// trigger exceptionif(3/0==1)System.out.println("");}@[email protected] void B() {User u1 = new User();u1.setAccount("test1");u1.setName("2");u1.setMobile("12345678913");u1.setPassword("111");this.save(u1);}

8. In the same class, transaction A drops non-transaction B (through injection) A or B throws an exception, AB transaction takes effect (transaction propagation)

@[email protected] void A() {User u = new User();u.setAccount("test");u.setName("1");u.setMobile("12345678912");u.setPassword("111");this.save(u);userService.B();// trigger exceptionif(3/0==1)System.out.println("");}@Overridepublic void B() {User u1 = new User();u1.setAccount("test1");u1.setName("2");u1.setMobile("12345678913");u1.setPassword("111");this.save(u1);}

Summary: 1. Transaction A drops B, AB has transactions (transaction propagation) 2. Non-transaction A drops transaction B, A has no transaction, B is only called by injection (AOP), B's transactionto take effect.3. Private cannot add transactions 4. If declarative transactions need to be refined, they can be split.