Question

我有以下存储库：

public interface PlayerRealBalanceRepository extends JpaRepository<PlayerRealBalance, Long> {

   @Modifying
   @Query("update PlayerRealBalance balance set balance.balance = (balance.balance + ?1) where balance.id = ?2")
   public void increaseBalance(long amount, long balanceId);
}

我的问题 - 这个查询线程安全吗？如果这样的2个并发查询完全同时执行怎么办？我是否必须使用锁定方法才能正常工作？

谢谢！

Answer 1

它将遇到ACID（原子性，一致性，隔离性，耐久性）问题。因此，更好地使用事务请参考spring transaction management here这里提供的是日志（自解释）如果实现事务管理会发生什么（虽然我使用Mybatis）

2014-02-11 16:48:21,008 [main] DEBUG o.s.j.d.DataSourceTransactionManager - Switching JDBC Connection [jdbc:oracle:thin] to manual commit
2014-02-11 16:48:21,013 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Creating a new SqlSession
2014-02-11 16:48:21,021 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Registering transaction synchronization for SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@16a23cf]
2014-02-11 16:48:21,091 [main] DEBUG o.m.s.t.SpringManagedTransaction - JDBC Connection [jdbc:oracle:thin:] will be managed by Spring

// does the db operation


2014-02-11 16:48:21,792 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@16a23cf]
2014-02-11 16:48:21,792 [main] DEBUG o.s.j.d.DataSourceTransactionManager - Initiating transaction commit
2014-02-11 16:48:21,792 [main] DEBUG o.s.j.d.DataSourceTransactionManager - Committing JDBC transaction on Connection [jdbc:oracle:thin:]
2014-02-11 16:48:21,792 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Transaction synchronization committing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@16a23cf]
2014-02-11 16:48:21,792 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Transaction synchronization closing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@16a23cf]
2014-02-11 16:48:21,792 [main] DEBUG o.s.jdbc.datasource.DataSourceUtils - Resetting isolation level of JDBC Connection [jdbc:oracle:thin:] to 2
2014-02-11 16:48:21,792 [main] DEBUG o.s.j.d.DataSourceTransactionManager - Releasing JDBC Connection [jdbc:oracle:thin:@] after transaction
2014-02-11 16:48:21,792 [main] DEBUG o.s.jdbc.datasource.DataSourceUtils - Returning JDBC Connection to DataSource

Spring数据 - 修改查询并发性

1 个答案: