今天寫代碼的時候有一個service需要用到事務，故使用@Transactional注解

@Transactional Map<String, Object> joinTeam(Long teamId, Long userId) throws Exception;

這里拋出自己定義的異常來實現事務回滾

接口實現類方法如下

public Map<String, Object> joinTeam(Long teamId, Long userId) throws Exception {Map<String, Object> result = new HashMap<>();Team team = teamService.getTeamById(teamId);//添加組隊成員TeamMember member = new TeamMember();member.setUserId(userId);member.setTeamId(teamId);teamMemberDao.saveTeamMember(member);//更新組隊人數team.setCurrentSignup(team.getCurrentSignup() + 1);Long count = teamService.updateTeamCurrentSignup(team);int i = 0;while (count == 0) {if (i >= 3) {throw new BaseException(BaseException.OPTIMISTIC_LOCK);}team = teamService.getTeamById(teamId);team.setCurrentSignup(team.getCurrentSignup() + 1);count = teamService.updateTeamCurrentSignup(team);i++;}result.put("success", true);result.put("message", "加入成功!");throw new Exception(BaseException.OPTIMISTIC_LOCK);}

teamMemberDao.saveTeamMember(member)?與?count = teamService.updateTeamCurrentSignup(team)?兩個修改庫操作，需要?teamService.updateTeamCurrentSignup(team)?拋異常來控制?teamMemberDao.saveTeamMember(member)?的數據回滾

但是結尾拋異常數據并不回滾，很是糟心。

于是查看Spring的Transactional的API文檔，發現下面這段：

If no rules are relevant?to?the?exception,?it?will be treated like DefaultTransactionAttribute (rolling?back?onruntime exceptions).

所以Transactional默認異常回滾是runtimeexcetion才回滾

excetion是所有異常的總稱。
而runtimeexcetion是具體的某一個異常。

所以得將Transactional設置回滾異常為excetion

故將接口修改如下，這次再拋自定義異常就會回滾了

@Transactional(readOnly = false, propagation = Propagation.REQUIRED, rollbackFor = Exception.class) Map<String, Object> joinTeam(Long teamId, Long userId) throws Exception;

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