Question

我正在使用Spring集成Hibernate项目。但是我在项目中添加了一对多，我收到了错误

我的SQL脚本：

create table users(
  username varchar(50) not null primary key,
  password varchar(50) not null,
  enabled boolean not null
  );

create table authorities (
  username varchar(50) not null,
  authority varchar(50) not null,
  constraint fk_authorities_users foreign key(username)references users(username));

UserVO类地图表用户

    @Entity
@Table(name="users",schema="public")
public class UserVO implements UserDetails,Serializable{

 /**
  * 
  */
 private static final long serialVersionUID = 1L;

 private String username;
 private String password;
 private boolean enabled;

 private Set<AuthorityVO>authorityList = new HashSet<AuthorityVO>();

 @Id
 @Column(name="username",length=50,nullable=false)
 @Override
 public String getUsername() {
  // TODO Auto-generated method stub
  return username;
 }

 public void setUsername(String username) {
  this.username = username;
 }

 @Column(name="password",length=50,nullable=false)
 @Override
 public String getPassword() {
  // TODO Auto-generated method stub
  return password;
 }

 public void setPassword(String password) {
  this.password = password;
 }

 @Column(name="enabled",nullable=false)
 @Override
 public boolean isEnabled() {
  // TODO Auto-generated method stub
  return enabled;
 }


 public void setEnabled(boolean enabled) {
  this.enabled = enabled;
 }


 @OneToMany(fetch = FetchType.LAZY,cascade = CascadeType.ALL,mappedBy="user")
 public Set<AuthorityVO> getAuthorityList() {
  return authorityList;
 }

 public void setAuthorityList(Set<AuthorityVO> authorityList) {
  this.authorityList = authorityList;
 }

 @Transient
 @Override
 public Collection<GrantedAuthority> getAuthorities() {
  // TODO Auto-generated method stub

  return null;
 }

 @Transient
 @Override
 public boolean isAccountNonExpired() {
  // TODO Auto-generated method stub
  return false;
 }
 @Transient
 @Override
 public boolean isAccountNonLocked() {
  // TODO Auto-generated method stub
  return false;
 }

 @Transient
 @Override
 public boolean isCredentialsNonExpired() {
  // TODO Auto-generated method stub
  return false;
 }
}

AuthorityVO类地图表权限

   @Entity
@Table(name="authorities",schema="public")
public class AuthorityVO {

 private UserVO user;
 private String authority;

 @ManyToOne(fetch=FetchType.LAZY)
 @JoinColumn(name="username",nullable=false)
 @ForeignKey(name="fk_authorities_users")
 public UserVO getUser() {
  return user;
 }

 public void setUser(UserVO user) {
  this.user = user;
 }


 @Column(name="authority",length = 50,nullable=false)
 public String getAuthority() {
  return authority;
 }

 public void setAuthority(String authority) {
  this.authority = authority;
 }

起初我没有在UserVO中添加@OneToMany而不是在AuthorityVO中添加，一切都很好。但是我将这些东西添加到我的项目中我得到了错误

  org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mySessionFactory' defined in ServletContext resource [/WEB-INF/dispatcher-servlet.xml]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: No identifier specified for entity: com.vaannila.vo.AuthorityVO
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1420)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:563)
 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)

我知道错误意味着AuthorityVO不是真正的地图与表权限。但我找到了很多网络和电子书，但我找不到问题在哪里修复。你能帮帮我吗？

Answer 1

你的实体AuthorityVO没有主键（数据库），而且在hibernate中也没有ID-Column（用@Id注释）。

此外，最好在UserVO中使用良好的数据库设计和语义列中的一些数字主键。

Answer 2

AnnotationException：没有为实体指定标识符：com.vaannila.vo.AuthorityVO

它意味着您没有任何数据库中的AuthorityVO类主键没有ID列像@id map with database。因此，对于AuthorityVO类，Hibernate找不到任何标识符（用于区分b / w对象并用于从数据库中获取对象的唯一列）。

一对多关系Hibernate问题

2 个答案: