Hibernate更新实体不知道主键

Question

我有一个美国实体，其id是主键，userId和ServiceId这些最后两个一起也是唯一的。现在我有一个userId和一个serviceId，我想更新一个美国实体，我不知道使用hibernate做正确的语法。请有人帮助我吗... 我已经使用注释进行实体映射：

@Id
@Column(name = "USERSERVICE_ID")
@GeneratedValue
private Integer id;

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "SERVICE_ID")
private Service service;

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "SERVICE_SEND_TYPE_ID")
private ServiceSendType serviceSendType;

@Column(name = "USERSERVICE_LASTSENT")
private String lastSentValue = "";

@Column(name = "USERSERVICE_UNSUBCTIMESTAMP")
private Date unsubscribeDate;

@Column(name = "USERSERVICE_SUBCTIMESTAMP")
private Date subscribeDate;

@Column(name = "USERSERVICE_ENABLED")
private Boolean enabled = false;

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "SERVICE_USER_ID")
private User user;

Answer 1

试试这个：

US entity = (US) session.createQuery("select s from US u where u.service.id = :serviceId and u.user.id = :userId")
.setParameter("serviceId", serviceId)
.setParameter("userId", userId)
.uniqueResult();
//update
entity.setEnabled(true); 

就是这样。从DB加载实体后，它会自动附加到当前会话，因此automatic dirty checking mechanism将检测到任何更改。