ejb高手进

Question

1.在weblogic集群和分布式环境下,这些代码会有问题吗？
                    DistributionVO objDistributionVO = distributionSes
                            .readDistribution(objMovementItemVO.getBatchId());    
                    objDistributionVO.setActualQty(objDistributionVO.getActualQty()
                            - objMovementItemVO.getQty());
                    objDistributionVO.setReservedQty(objDistributionVO.getReservedQty()
                            - objMovementItemVO.getQty());
                    distributionSes.updateDistribution(objDistributionVO);
                    objDistributionVO.setActualQty(objMovementItemVO.getQty());
                    objDistributionVO.setReservedQty(0d);
                    objDistributionVO.setLocationId(objMovementItemVO.getToId());                    int iBatchId = distributionSes.insertDistribution(objDistributionVO);2. objDistributionVO1 一定会是前面修改后的结果吗??
                 DistributionVO objDistributionVO = distributionSes
                            .readDistribution(objMovementItemVO.getBatchId());
                    objDistributionVO.setActualQty(objDistributionVO.getActualQty()
                            - objMovementItemVO.getQty());
                    objDistributionVO.setReservedQty(objDistributionVO.getReservedQty()
                            - objMovementItemVO.getQty());                    DistributionVO objDistributionVO1 = distributionSes
                            .readDistribution(objMovementItemVO.getBatchId());3.使用连接池怎样保证每个连接会话的数据一致性的???我们每次请求数据库都可能获取的是不同的连接呀？？？？谢谢了。