解决客户端 query did not return aunique result:2

从字面意思很好理解，查询出了两条相同的记录，说明数据库出现了脏数据，反复检验程序并未发现有bug。

最终确定是由于程序是布在两个节点上。当同一用户发出两次相同的请求时，执行的两次保存数据的动作，被分别分配在了两台节点服务上边，导致了脏数据的产生。

解决办法：系统架构是用的是 hibernate。则使用框架自带的乐观锁来保证事务的完整性

乐观锁的工作原理：读取出数据时，将此版本号一同读出，之后更新时，对此版本号加一。此时，将提交数据的版本数据与数据库表对应记录的当前版本信息进行比对，如果提交的数据版本号大于数据库表当前版本号，则予以更新，否则认为是过期数据

@Entity
@Table(name = "customer")
@ApiModel
public class Customer extends BaseEntity {@Version
    @Column(nullable = false)private Long version;

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