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@Service
public class MultiDatasourceService {

    @Resource
    private MultiDatasourceService multiDatasourceService;

    @Resource
    private TestMapper testMapper;

    @Transactional
    public void updateNameById(Long id) {
        int i = 1;
        testMapper.updateById(id, "clcl");
        // 调用另外一个事务方法
        multiDatasourceService.updateNameById1(id);
        int j = 2;
    }

    @Transactional(propagation = Propagation.REQUIRES_NEW)
    public void updateNameById1(Long id) {
            int i = 1;
        testMapper.updateById(3L, "clcl");
    }
}