update

mec-im/src/main/java/com/ym/dao/RoomDao.java

@@ -16,6 +16,7 @@ import java.util.List;
  */
 @Repository
 public interface RoomDao extends JpaRepository<Room, Long> {
+    @Lock(value = LockModeType.PESSIMISTIC_WRITE)
     public List<Room> findByRid(String rid);
 
     @Transactional