Varlıklar eşlemede olduğunda birincil anahtar olmayan değer nasıl edinilir?

Question

AssignCoScholastic.java

@Entity 
    @Table(name="assignCoScholastic") 
    public class AssignCoScholastic 
    { 
     @Id 
     @GeneratedValue(strategy=GenerationType.AUTO) 
     private int assginCoScholasticId; 
     @ManyToOne 
     @JoinColumn(name="assignClassId") 
     private AssignClass assignClass; 
     @ManyToOne 
     @JoinColumn(name="coscholasticId") 
     private CoScholastic coscholastic; 
     @ManyToOne 
     @JoinColumn(name="subCoScholasticId") 
     private SubCoScholasticActivity subCoScholasticActivity; 
     private String year; 
     @ManyToOne 
     @JoinColumn(name="school_id") 
     private SchoolModel schoolModel; 

CoScholastic.java

@Entity 
@Table(name="coscholastic") 
public class CoScholastic { 

    @Id 
    @GeneratedValue(strategy=GenerationType.AUTO) 
    private int coScholasticId; 
    @Column(name="Coscholastic_Name") 
    private String coscholasticName; 
    // Getters and Setters 

Uygulama: Ben kodunun üzerinde yürütmeye çalışırken istisna altında alıyorum

@Override 
    public List<Object[]> listOfAssignCoScholastics(int assiginedClass, int schoolId, String year) { 
     Session session=sessionFactory.openSession(); 
     session.beginTransaction(); 
     List<Object[]> listOfAssignCoScholastics=new ArrayList<Object[]>(); 
     try 
     { 
     Criteria criteria=session.createCriteria(AssignCoScholastic.class); 
     criteria.setProjection(Projections.property("coscholastic.coScholasticId")); 
     criteria.setProjection(Projections.property("coscholastic.coscholasticName")); 
     criteria.add(Restrictions.eq("assignClass.assignID", assiginedClass)); 
     criteria.add(Restrictions.eq("schoolModel.school_id", schoolId)); 
     criteria.add(Restrictions.like("year", year)); 
     listOfAssignCoScholastics=criteria.list(); 
     session.getTransaction().commit(); 
     }catch(Exception ex){ 
      ex.printStackTrace(); 
     }finally{ 
      session.close(); 
      sessionFactory.close(); 
     } 
     return listOfAssignCoScholastics; 
    } 

.

org.hibernate.QueryException: could not resolve property: ve nasıl çözüleceğini nedir ??

İstisna:

org.hibernate.QueryException: could not resolve property: coscholastic.coscholasticName of: com.slv.model.AssignCoScholastic 
at org.hibernate.persister.entity.AbstractPropertyMapping.propertyException(AbstractPropertyMapping.java:81) 
at org.hibernate.persister.entity.AbstractPropertyMapping.toType(AbstractPropertyMapping.java:75) 
at org.hibernate.persister.entity.AbstractEntityPersister.toType(AbstractEntityPersister.java:1465) 
at org.hibernate.loader.criteria.CriteriaQueryTranslator.getType(CriteriaQueryTranslator.java:547) 
at org.hibernate.criterion.PropertyProjection.getTypes(PropertyProjection.java:60) 
at org.hibernate.loader.criteria.CriteriaQueryTranslator.getProjectedTypes(CriteriaQueryTranslator.java:362) 
at org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:100) 
at org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:82) 
at org.hibernate.loader.criteria.CriteriaLoader.<init>(CriteriaLoader.java:92) 
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1697) 
at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:347) 
at com.slv.daoimpl.RegistrationDaoImpl.listOfAssignCoScholastics(RegistrationDaoImpl.java:1907) 
at com.slv.controller.SchoolController.loadAssignCoscholastic(SchoolController.java:920) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 

Answer 1

Criteria criteria=session.createCriteria(AssignCoScholastic.class,"assignCoScholastic"); 
    criteria.createAlias("assignCoScholastic.coscholastic", "coscholasticss") 
    .setProjection(Projections.distinct(Projections.projectionList() 
    .add(Projections.property("coscholasticss.coScholasticId")) 
    .add(Projections.property("coscholasticss.coscholasticName")))); 
    criteria.add(Restrictions.eq("assignClass.assignID", assiginedClass)); 
    criteria.add(Restrictions.eq("schoolModel.school_id", schoolId)); 
    criteria.add(Restrictions.like("year", year)); 

Answer 2

İhtiyacınız sınıf özellik hazırda anlatmalıyız. sql quiresinde yazdığınız bir üye gibi.

Criteria criteria=session.createCriteria(AssignCoScholastic.class,"assignCoScholastic"); 
criteria.createAlias("assignCoScholastic.coscholastic", "coscholastic"); 
criteria.createAlias("assignCoScholastic.assignClass", "assignClass"); 
criteria.createAlias("assignCoScholastic.schoolModel", "schoolModel"); 
criteria.setProjection(Projections.property("coscholastic.coScholasticId")); 
criteria.setProjection(Projections.property("coscholastic.coscholasticName")); 
criteria.add(Restrictions.eq("assignClass.assignID", assiginedClass)); 
criteria.add(Restrictions.eq("schoolModel.school_id", schoolId));//school_id is the property in class schoolModel 
criteria.add(Restrictions.like("assignCoScholastic.year", year)); 

classAliasHavingYear duyun

bu şekilde deneyin

, sınıf sahip yıl özellik için oluşturulan takma adıdır.

kod sizin dinlenme ...