複合主鍵查詢

Question

我有一個複合主鍵。鑰匙又是兩個實體。我想根據主鍵內的實體進行查詢。

我的目的是在主鍵是這樣的

Criteria projCriteria = session.createCriteria(ProjectDetailsRO.class); 
     projCriteria.createAlias("projectUsers", "projectUsers"); 
     projCriteria.add(Restrictions.eq("projectUsers.pk.users.email", leadUserEmail)); 

查詢，但我得到一個異常 無法解析屬性：pk.users.email的：com.ett.repository.ProjectUsers

我想查詢基於用戶（PK類）。如何爲PK類中的實體（UserDetailsRO）提供別名。請幫忙..！！

的實體和關係如下

@Entity 
@Table(name="PROJECT_USERS") 
@AssociationOverrides({ 
@AssociationOverride(name="pk.users", joinColumns=@JoinColumn(name="user_id")), 
@AssociationOverride(name="pk.project", joinColumns=@JoinColumn(name="project_id")) 
}) 
public class ProjectUsers { 

    private ProjectUserPK pk= new ProjectUserPK(); 




    @EmbeddedId 
    public ProjectUserPK getPk() { 
     return pk; 
    } 

    public void setPk(ProjectUserPK pk) { 
     this.pk = pk; 
    } 

    @Transient 
    public ProjectDetailsRO getProjects() { 
     return getPk().getProject(); 
    } 

    public void setProjects(ProjectDetailsRO projects) { 
     getPk().setProject(projects); 
    } 


    @Transient 
    public UserDetailsRO getUsers() { 
     return getPk().getUsers(); 
    } 

    public void setUsers(UserDetailsRO users) { 
     getPk().setUsers(users); 
    } 



    @Override 
    public int hashCode() { 
     final int prime = 31; 
     int result = 1; 
     result = prime * result + ((isLead == null) ? 0 : isLead.hashCode()); 
     result = prime * result + ((pk == null) ? 0 : pk.hashCode()); 
     return result; 
    } 

    @Override 
    public boolean equals(Object obj) { 
     if (this == obj) 
      return true; 
     if (obj == null) 
      return false; 
     if (getClass() != obj.getClass()) 
      return false; 
     ProjectUsers other = (ProjectUsers) obj; 
     if (isLead == null) { 
      if (other.isLead != null) 
       return false; 
     } else if (!isLead.equals(other.isLead)) 
      return false; 
     if (pk == null) { 
      if (other.pk != null) 
       return false; 
     } else if (!pk.equals(other.pk)) 
      return false; 
     return true; 
    } 



} 

THE PRIMARY KEY CLASS 
---------------------- 

@Embeddable 
public class ProjectUserPK implements Serializable{ 

    private ProjectDetailsRO project; 

    private UserDetailsRO users; 

    @ManyToOne 
    public ProjectDetailsRO getProject() { 
     return project; 
    } 

    public void setProject(ProjectDetailsRO project) { 
     this.project = project; 
    } 


    @ManyToOne 
    public UserDetailsRO getUsers() { 
     return users; 
    } 

    public void setUsers(UserDetailsRO users) { 
     this.users = users; 
    } 

    @Override 
    public int hashCode() { 
     final int prime = 31; 
     int result = 1; 
     result = prime * result + ((project == null) ? 0 : project.hashCode()); 
     result = prime * result + ((users == null) ? 0 : users.hashCode()); 
     return result; 
    } 

    @Override 
    public boolean equals(Object obj) { 
     if (this == obj) 
      return true; 
     if (obj == null) 
      return false; 
     if (getClass() != obj.getClass()) 
      return false; 
     ProjectUserPK other = (ProjectUserPK) obj; 
     if (project == null) { 
      if (other.project != null) 
       return false; 
     } else if (!project.equals(other.project)) 
      return false; 
     if (users == null) { 
      if (other.users != null) 
       return false; 
     } else if (!users.equals(other.users)) 
      return false; 
     return true; 
    } 


} 

The Main ENtity 
===================== 


@Entity 
@Table(name="PROJECT_DTLS") 
public class ProjectDetailsRO { 

    @Id 
    @GeneratedValue(strategy=GenerationType.AUTO) 
    @Column(name="PROJECT_ID") 
    private Long projectId; 


    @OneToMany(fetch=FetchType.LAZY, mappedBy="pk.project", cascade=CascadeType.ALL) 
    private List<ProjectUsers>projectUsers = new LinkedList<ProjectUsers>(); 




    public void addUser(UserDetailsRO user, Character lead){ 
     ProjectUsers association = new ProjectUsers(); 
     association.setUsers(user); 
     association.setProjects(this); 
     association.setIsLead(lead); 

     this.projectUsers.add(association); 
     user.getProjectUsers().add(association); 
    } 

    public List<ProjectUsers> getProjectUsers() { 
     return projectUsers; 
    } 

    public void setProjectUsers(List<ProjectUsers> projectUsers) { 
     this.projectUsers = projectUsers; 
    } 

} 

Answer 1

你沒有提供UserDetailsRO類，所以我們假設它的「電子郵件」屬性屬性annotized，如果是這種情況，請嘗試在Criteria中向'users'創建別名。例如：

Criteria projCriteria = session.createCriteria(ProjectDetailsRO.class); 
projCriteria.createAlias("projectUsers", "projectUsers"); 
projCriteria.createAlias("pk", "projectUsers.pk"); 
projCriteria.createAlias("users", "pk.users"); 
projCriteria.add(Restrictions.eq("users.email", leadUserEmail));