Java如何实现对Mysql数据库的行锁

    <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->  
    <bean id="transactionManager"  
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">  
        <property name="dataSource" ref="dataSource" />  
    </bean>
    <!-- 使用annotation定义事务 -->
     <tx:annotation-driven transaction-manager="transactionManager" />

@Transactional
    @Override
    public boolean increaseBalanceByLock(Long userId, BigDecimal amount)
        throws ValidateException {
        long time = System.currentTimeMillis();
        //获取对记录的锁定
        UserBalance balance = userBalanceDao.getLock(userId);
        LOGGER.info("[lock] start. time: {}", time);
        if (null == balance) {
            throw new ValidateException(
                ValidateErrorCode.ERRORCODE_BALANCE_NOTEXIST,
                "user balance is not exist");
        }
        boolean result = userBalanceDao.increaseBalanceByLock(balance, amount);
        long timeEnd = System.currentTimeMillis();
        LOGGER.info("[lock] end. time: {}", timeEnd);
        return result;
    }

  <select id="getLock" resultMap="BaseResultMap" parameterType="java.lang.Long">
        <![CDATA[
            select * from user_balance where id=#{id,jdbcType=BIGINT} for update;
        ]]>
    </select>

update user_balance set Balance = #{balance,jdbcType=DECIMAL},Version = Version+1 where Id = #{id,jdbcType=BIGINT} and Version = #{version,jdbcType=BIGINT}