求解休眠复制插入
但真正的问题是不休眠,它主要是我和第二个Netbeans。
我正在发帖,并保存我的数据。但是我在js中做了一个重复的帖子,Netbeans不会两次触发断点(我不知道为什么)。所以,对我来说,这是一个职位,只有一个插入。但是,不,两个帖子和两个插入。
抱歉失去你的时间:/
我对Hibernate,所以我有一些问题,也许它只是一个愚蠢的人,我真的不知道。
我想用@ManyToOne关系向数据库插入一个对象,但是当我坚持并提交事务时,Hibernate正在复制它。这是我的代码。
网友发帖类
@Entity
@Table(name = "USERPOST", schema = "ADMIN1")
public class UserPost implements java.io.Serializable {
private int iduserpost;
private String detail;
private User user;
public UserPost() {
}
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "IDUSERPOST", unique = true, nullable = false)
public int getIduserpost() {
return this.iduserpost;
}
public void setIduserpost(int iduserpost) {
this.iduserpost = iduserpost;
}
@Column(name = "DETAIL", nullable = false)
public String getDetail() {
return this.detail;
}
public void setDetail(String detail) {
this.detail = detail;
}
@ManyToOne
@JoinColumn(name = "IDUSER")
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
用户类别
@Entity
@Table(name = "USER", schema = "ADMIN1")
public class User implements java.io.Serializable {
private int iduser;
private String name;
private String email;
private Set<UserPost> posts;
public User() {
}
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "IDUSER", unique = true, nullable = false)
public int getIduser() {
return this.iduser;
}
public void setIduser(int iduser) {
this.iduser = iduser;
}
@Column(name = "NAME", nullable = false)
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
@Column(name = "EMAIL", nullable = false)
public String getEmail() {
return this.email;
}
public void setEmail(String email) {
this.email = email;
}
@OneToMany(mappedBy = "user")
public Set<UserPost> getPosts() {
return posts;
}
public void setPosts(Set<UserPost> posts) {
this.posts = posts;
}
}
插入方法对经理
public void Insert(Object data) {
Session session = null;
try {
session = hibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
session.persist(data);
session.getTransaction().commit();
} catch (Exception e) {
System.err.println(e.getMessage());
throw e;
} finally {
if (session.isOpen()) {
session.close();
}
}
}
上的Servlet插入
FeedManager manager = new FeedManager();
UserPost post = new UserPost();
post.setDetail(text);
User usrPesist = (User) manager.GetById(User.class, idUser);
post.setUser(usrPesist);
manager.Insert(post);
我得到的结果是两个UserPosts插入数据库,当我想要的只是一个。
有什么问题吗?
请启用[SQL日志记录](http://stackoverflow.com/a/1713464/4754790)并从日志中发布相关摘录。 –