一、演示Spring的传播行为（SUPPORTS）

1.1、StockServiceImplSUPPORTS 

/*** @Author : 一叶浮萍归大海* @Date: 2023/10/30 15:43* @Description: 演示SUPPORTS的传播行为*      外部不存在事务：不开启新的事务*      外部存在事务：融合到外部事务中*/
@Service(value = "stockServiceImplSUPPORTS")
public class StockServiceImplSUPPORTS extends ServiceImpl<StockMapper, StockDO> implements StockService {@Resourceprivate StockMapper stockMapper;@Resourceprivate IntegralService integralServiceImplSUPPORTS;/*** SUPPORTS的传播行为* @param id* @param num* 场景一：外部不存在事务（注释掉reduceStock的@Transactional注解），内部存在事务（传播属性为SUPPORTS）*      预期结果：外部普通方法 & 内部事务方法都正常提交*      实际结果：外部普通方法 & 内部事务方法都正常提交*      对应方法：m1()** 场景二：外部存在事务（REQUIRED），内部存在事务（MANDATORY）*      预期结果：外部事务 & 内部事务都回滚*      实际结果：外部事务 & 内部事务都回滚*      对应方法：m1()* ...*/@Transactional(propagation = Propagation.REQUIRED,rollbackFor = Exception.class)@Overridepublic void reduceStock(Long id, Integer num) {m1(id, num);}private void m1(Long id, Integer num) {System.out.println("==============>StockServiceImplSUPPORTS的m1()执行了");try {// 减库存StockDO dbStock = stockMapper.selectById(id);StockDO updateStock = new StockDO();BeanUtils.copyProperties(dbStock, updateStock);updateStock.setNum(dbStock.getNum() - num);stockMapper.updateById(updateStock);// 增加积分IntegralDO updateIntegral = new IntegralDO();updateIntegral.setPreIntegral(0);updateIntegral.setCurrentIntegral(1000);updateIntegral.setUserId(1L);integralServiceImplSUPPORTS.addIntegral(updateIntegral);int i = 10 / 0;} catch (Exception e) {throw new RuntimeException(e);}}}

1.2、IntegralServiceImplSUPPORTS 

/*** @Author : 一叶浮萍归大海* @Date: 2023/10/30 15:43* @Description: 演示NESTED的传播行为*      外部不存在事务：*      外部存在事务：*/
@Service(value = "integralServiceImplSUPPORTS")
public class IntegralServiceImplSUPPORTS extends ServiceImpl<IntegralMapper, IntegralDO> implements IntegralService {@Resourceprivate IntegralMapper integralMapper;@Transactional(propagation = Propagation.SUPPORTS,rollbackFor = Exception.class)@Overridepublic void addIntegral(IntegralDO updateIntegral) {m1(updateIntegral);}private void m1(IntegralDO updateIntegral) {try {System.out.println("==============>IntegralServiceImplSUPPORTS的m1()执行了");integralMapper.insert(updateIntegral);int i = 10 / 0;} catch (Exception e) {throw new RuntimeException(e);}}}