java总结

1. pom子包和父包不在一个文件夹
   错误提示:Non-resolvable parent POM for com.ruoyi.kserver:kweb:3.8.7: The following
   解决办法只需要在 parent标签内添加 relativePath 指定父类pom.xml所在路径即可
2. mybatis-plus 报 'Invalid bound statement (not found)'
   1. 检查 @MapperScan 路径。范围不能过大 建议最好是 mapper包目录
3. springboot手动开启事务

   //第一种
   @Service
   public class MyService {
   
   	@Autowired
   	private TransactionTemplate transactionTemplate;
   
   	@Autowired
   	private SomeRepository someRepository;
   
   	public void performBusinessLogic() {
   		transactionTemplate.execute(new TransactionCallbackWithoutResult() {
   			@Override
   			protected void doInTransactionWithoutResult(TransactionStatus status) {
   				try {
   					// 业务逻辑
   					someRepository.save(new Entity("Data1"));
   					someRepository.save(new Entity("Data2"));
   
   					// 如果发生异常，手动触发回滚
   					if (someCondition) {
   						throw new RuntimeException("Something went wrong!");
   					}
   				} catch (Exception e) {
   					// 触发回滚
   					status.setRollbackOnly();
   					throw e; // 重新抛出异常
   				}
   			}
   		});
   	}
   }
   

   //第二种
   @Autowired
   	private PlatformTransactionManager transactionManager;
   
   	public void updateOrders(List<Integer> orderIds) {
   		DefaultTransactionDefinition def = new DefaultTransactionDefinition();
   		def.setName("updateOrdersTransaction");
   		def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);
   
   		TransactionStatus status = transactionManager.getTransaction(def);
   
   		try {
   			// 执行更新操作
   			// 这里假设你有一个 KOrderMapper
   			KOrderMapper kOrderMapper = ...; // 从你的配置中获取 KOrderMapper
   			kOrderMapper.update(null, vQuery);
   
   			// 提交事务
   			transactionManager.commit(status);
   		} catch (Exception e) {
   			// 回滚事务
   			transactionManager.rollback(status);
   			throw e;
   		}
   	}
   	
   	
   

知识点

1. classpath*: 扫描跨模块的文件, classpath: 会扫描当个模块文件