源码下载
ChaiRongD/Demooo - Gitee.com
不生效场景1：try-catch捕获了
不生效原因：内部逻辑把异常捕获吞了，所以不生效
@Transactional public void transactionalNotEffect01() { try { Person p1 = new Person(); p1.setName(LocalDateTime.now().toString()); personDao.insertSelective(p1); int i = 1 / 0; } catch (Exception e) { e.printStackTrace(); System.out.println("my error"); } }
不生效场景2：方法不使用public修饰
不生效原因：他会判断是不是public，源码中明确规定
@Service public class StudentService { @Autowired private PersonDao personDao; // 不生效2 @Transactional protected void transactionalNotEffect02() { Person p1 = new Person(); p1.setName(LocalDateTime.now().toString()); personDao.insertSelective(p1); int i = 1 / 0; } }
@RestController public class TransactionalNotEffect02Controller { @Autowired private StudentService studentService; @GetMapping("/transactionalNotEffect02") public Object getAll(){ studentService.transactionalNotEffect02(); return 1; } }
不生效场景3：通过this调用，没有走代理方法
不生效原因：自己掉自己的方法，这样方式不会走代理，所以事务失效
// 不生效3 public void transactionalNotEffect03() { this.addPerson(); } @Transactional public void addPerson() { Person p1 = new Person(); p1.setName(LocalDateTime.now().toString()); personDao.insertSelective(p1); int i = 1 / 0; }
@RestController public class StudentController { @Autowired private StudentService studentService; @GetMapping("/transactionalNotEffect03") public Object transactionalNotEffect03() throws Exception { studentService.transactionalNotEffect03(); return 1; } }
不生效场景4：@Transactional 注解属性 propagation 设置错误
不生效原因：见下面的
@Service public class StudentService { @Autowired private PersonDao personDao; // 不生效4 @Transactional(propagation= Propagation.NOT_SUPPORTED) public void transactionalNotEffect04() { Person p1 = new Person(); p1.setName(LocalDateTime.now().toString()); personDao.insertSelective(p1); int i = 1 / 0; } }
@GetMapping("/transactionalNotEffect04") public Object transactionalNotEffect04() throws Exception { studentService.transactionalNotEffect04(); return 1; }
不生效场景5：@Transactional的rollbackFor 属性与实际异常不匹配
根本原因：rollbackFor属性监听的是RuntimeException，而下面的代码是FileNotFoundException。不是父子关系，没有交集，匹配失败，所以事务失效。
@Transactional(propagation = Propagation.REQUIRED,rollbackFor = RuntimeException.class) public void transactionalNotEffect05() throws Exception{ Person p1 = new Person(); p1.setName(LocalDateTime.now().toString()); personDao.insertSelective(p1); //不存在的文件 int read = new FileInputStream(new File("D://尚硅谷周阳老师//1.txt")).read(); }
不生效场景6：数据库引擎不支持事务
不生效场景7：线程不同不支持事务
不生效原因：事务回滚的单位是建立在connection上，而connection是存在ThreadLocal中，因为不同的线程ThreadLocal存的connection自然不一样，那该场景就不符合预期（都回滚）了。
// 不生效7 @Transactional(propagation = Propagation.REQUIRED,rollbackFor = Exception.class) public void transactionalNotEffect07() { Person p1 = new Person(); p1.setName(LocalDateTime.now().toString()); personDao.insertSelective(p1); new Thread( () -> { Person p2 = new Person(); p2.setName(LocalDateTime.now().toString()); personDao.insertSelective(p2); int i = 1 / 0; }, "t1") .start(); }
