JPA @EmbeddedId,

Question

dizilimi oluşturmuyor. Bir sıra ve iki yabancı anahtar içeren iki yabancı anahtar içeren kompozit birincil anahtara sahip bir tablom var Varlık sınıfım devam edebilir ancak diziye göre üretmiyor. Bir dizi ve iki yabancı anahtarları maven içinde hbm2java oluşan birincil anahtar vardır tablo Burada ayrılmış unsurları

aşağıdaki ana varlık Burada

 

package aop.web.teacher.rmodels; 

// Generated Dec 14, 2010 8:45:32 PM by Hibernate Tools 3.2.2.GA 

import java.util.Date; 
import javax.persistence.AttributeOverride; 
import javax.persistence.AttributeOverrides; 
import javax.persistence.Column; 
import javax.persistence.EmbeddedId; 
import javax.persistence.Entity; 
import javax.persistence.FetchType; 
import javax.persistence.JoinColumn; 
import javax.persistence.ManyToOne; 
import javax.persistence.Table; 
import javax.persistence.Temporal; 
import javax.persistence.TemporalType; 

/** 
* Schoolmaster generated by hbm2java 
*/ 
@Entity 
@Table(name = "schoolmaster", schema = "public") 
public class Schoolmaster implements java.io.Serializable { 

private SchoolmasterId id; 
     ... 


@EmbeddedId 
@AttributeOverrides({ 
    @AttributeOverride(name = "id", column = @Column(name = "id", nullable = false)), 
    @AttributeOverride(name = "districtId", column = @Column(name = "district_id", nullable = false)), 
    @AttributeOverride(name = "typeOfSchool", column = @Column(name = "type_of_school", nullable = false)) }) 
public SchoolmasterId getId() { 
    return this.id; 
} 

public void setId(SchoolmasterId id) { 
    this.id = id; 
} 

@ManyToOne(fetch = FetchType.LAZY) 
@JoinColumn(name = "type_of_school", nullable = false, insertable = false, updatable = false) 
public AopTeachersTypeMaster getAopTeachersTypeMaster() { 
    return this.aopTeachersTypeMaster; 
} 

public void setAopTeachersTypeMaster(
    AopTeachersTypeMaster aopTeachersTypeMaster) { 
    this.aopTeachersTypeMaster = aopTeachersTypeMaster; 
} 

@ManyToOne(fetch = FetchType.LAZY) 
@JoinColumn(name = "school_nature") 
public AopTeachersSchoolNatureMaster getAopTeachersSchoolNatureMaster() { 
    return this.aopTeachersSchoolNatureMaster; 
} 

public void setAopTeachersSchoolNatureMaster(
    AopTeachersSchoolNatureMaster aopTeachersSchoolNatureMaster) { 
    this.aopTeachersSchoolNatureMaster = aopTeachersSchoolNatureMaster; 
} 

@ManyToOne(fetch = FetchType.EAGER) 
@JoinColumn(name = "district_id", nullable = false, insertable = false, updatable = false) 
public AopTeachersDistrictMaster getAopTeachersDistrictMaster() { 
    return this.aopTeachersDistrictMaster; 
} 

public void setAopTeachersDistrictMaster(
    AopTeachersDistrictMaster aopTeachersDistrictMaster) { 
    this.aopTeachersDistrictMaster = aopTeachersDistrictMaster; 
} 

@Column(name = "school_name", length = 50) 
public String getSchoolName() { 
    return this.schoolName; 
} 

public void setSchoolName(String schoolName) { 
    this.schoolName = schoolName; 
} 

@Column(name = "school_address") 
public String getSchoolAddress() { 
    return this.schoolAddress; 
} 

public void setSchoolAddress(String schoolAddress) { 
    this.schoolAddress = schoolAddress; 
} 

@Column(name = "school_phone_number", length = 12) 
public String getSchoolPhoneNumber() { 
    return this.schoolPhoneNumber; 
} 

public void setSchoolPhoneNumber(String schoolPhoneNumber) { 
    this.schoolPhoneNumber = schoolPhoneNumber; 
} 

@Temporal(TemporalType.DATE) 
@Column(name = "establishment_date", length = 13) 
public Date getEstablishmentDate() { 
    return this.establishmentDate; 
} 

public void setEstablishmentDate(Date establishmentDate) { 
    this.establishmentDate = establishmentDate; 
} 

@Column(name = "school_no_of_teachers") 
public Integer getSchoolNoOfTeachers() { 
    return this.schoolNoOfTeachers; 
} 

public void setSchoolNoOfTeachers(Integer schoolNoOfTeachers) { 
    this.schoolNoOfTeachers = schoolNoOfTeachers; 
} 

@Column(name = "school_no_of_students") 
public Integer getSchoolNoOfStudents() { 
    return this.schoolNoOfStudents; 
} 

public void setSchoolNoOfStudents(Integer schoolNoOfStudents) { 
    this.schoolNoOfStudents = schoolNoOfStudents; 
} 

} 

 

gömülü PK sınıf olduğunu verir. İşte

 

/** 
* SchoolmasterId generated by hbm2java 
*/ 
@Embeddable 
public class SchoolmasterId implements java.io.Serializable { 


    private long id; 
    private long districtId; 
    private long typeOfSchool; 

    public SchoolmasterId() { 
    } 

    public SchoolmasterId(long id, long districtId, long typeOfSchool) { 
     this.id = id; 
     this.districtId = districtId; 
     this.typeOfSchool = typeOfSchool; 
    } 


    @Column(name="id", nullable=false) 
    @GeneratedValue(strategy=GenerationType.SEQUENCE) 
    public long getId() { 
     return this.id; 
    } 

    public void setId(long id) { 
     this.id = id; 
    } 

    @NaturalId 
    @Column(name="district_id", nullable=false) 
    public long getDistrictId() { 
     return this.districtId; 
    } 

    public void setDistrictId(long districtId) { 
     this.districtId = districtId; 
    } 
    @NaturalId 
    @Column(name="type_of_school", nullable=false) 
    public long getTypeOfSchool() { 
     return this.typeOfSchool; 
    } 

    public void setTypeOfSchool(long typeOfSchool) { 
     this.typeOfSchool = typeOfSchool; 
    } 


    public boolean equals(Object other) { 
     if ((this == other)) return true; 
    if ((other == null)) return false; 
    if (!(other instanceof SchoolmasterId)) return false; 
    SchoolmasterId castOther = (SchoolmasterId) other; 

    return (this.getId()==castOther.getId()) 
&& (this.getDistrictId()==castOther.getDistrictId()) 
&& (this.getTypeOfSchool()==castOther.getTypeOfSchool()); 
    } 

    public int hashCode() { 
     int result = 17; 

     result = 37 * result + (int) this.getId(); 
     result = 37 * result + (int) this.getDistrictId(); 
     result = 37 * result + (int) this.getTypeOfSchool(); 
     return result; 
    } 


} 

 

Ben ... Kimliği otomatik olarak oluşturulan edilecek bekliyorum Sadece

 

@NaturalId 
 

ve

 

@GeneratedValue(strategy=GenerationType.SEQUENCE) 
 

Ben de GenerationType.AUTO ile denedi eklendi ama did var çalışmıyor Lütfen öneriniz.

Answer 1

Bu sorunla ilgili bir çözüm var. Aynı durumla karşılaştım, kompozit anahtarlar olarak 4 alanım var, bunlardan 1'inin sırayla üretilmesi gerekiyor. Gömülü sınıf oluşturmadım, yalnızca dizi tarafından oluşturulmaları gereken 1 @Id alanına sahibim. Tüm alan değerleri basit sütunlar olur, başvuru kaynağı bütünlüğü DB'de zorlanır ve ayrıca kodda 3 alanın kalan değerlerini boş değere göre kontrol ediyorum.

Hata durumunda işlem geri alma olacaktır.

Answer 2

Sadece 2c'yi eklemek istiyorum. Bu, bileşik ve tek birincil anahtarlarla çalışır. Sekans oluşturmayı önleyin, bunun yerine tablodan maksimum + 1'i seçin.

Identifiable.java

package my.app.hibernate; 

import java.io.Serializable; 

public interface Identifiable<T extends Serializable> { 
    T getId(); 
} 

CompositeKeyEntity.java

package my.app.hibernate; 

import java.io.Serializable; 

public interface CompositeKeyEntity<T extends Serializable> extends Identifiable<T> { 
} 

SingleKeyEntity.java

package my.app.hibernate; 

import java.io.Serializable; 

public interface SingleKeyEntity<T extends Serializable> extends Identifiable<T> { 
} 

AssignedIdentityGenerator.java

package my.app.hibernate; 

import java.io.Serializable; 
import java.lang.reflect.Field; 
import java.util.Arrays; 
import java.util.List; 

import org.hibernate.Criteria; 
import org.hibernate.criterion.Projections; 
import org.hibernate.criterion.Restrictions; 
import org.hibernate.engine.spi.SessionImplementor; 
import org.hibernate.id.IdentityGenerator; 
import org.hibernate.internal.CriteriaImpl; 
import org.slf4j.Logger; 
import org.slf4j.LoggerFactory; 
import org.springframework.security.util.FieldUtils; 

public class AssignedIdentityGenerator extends IdentityGenerator { 
    private static final String ID_FIELD_NAME = "id"; 
    private final Logger LOG = LoggerFactory.getLogger(this.getClass()); 
    private Field sequenceField; 
    private String entityClassName; 

    @Override 
    public Serializable generate(SessionImplementor session, Object obj) { 
     @SuppressWarnings("unchecked") 
     Identifiable<Serializable> identifiable = (Identifiable<Serializable>)obj; 

     entityClassName = obj.getClass().getName(); 
     Criteria criteria = new CriteriaImpl(entityClassName, session); 
     criteria.setReadOnly(true); 
     Object toSet = null; 

     if (identifiable instanceof CompositeKeyEntity) { 
      Serializable id = identifiable.getId(); 
      if (id != null) { 
       String embaddebleClassName = id.getClass().getName(); 
       buildCriteriaForEmbeddedId(id, embaddebleClassName, criteria); 
       toSet = id; 
      } 
     } else if (obj instanceof SingleKeyEntity) { 
      toSet = identifiable; 
      sequenceField = FieldUtils.getField(identifiable.getClass(), ID_FIELD_NAME); 
      buildCriteriaForSingleId(criteria); 
     } 

     Number one = castToSequenceNumberType(1L); 
     Number value = (Number) criteria.uniqueResult(); 

     if(value != null) { 
      value = castToSequenceNumberType(value.longValue() + one.longValue()); 

      setFieldValue(sequenceField, value, toSet); 
     } else { 
      value = one; 
      setFieldValue(sequenceField, value, toSet); 
     } 

     return identifiable.getId(); 
    } 

    private void buildCriteriaForSingleId(Criteria criteria) { 
     criteria.setProjection(Projections.max(ID_FIELD_NAME).as("seq")); 
    } 

    private void buildCriteriaForEmbeddedId(Serializable id, String embaddebleClassName, Criteria criteria) { 
     List<Field> fields = Arrays.asList(id.getClass().getDeclaredFields()); 

     class Utils { 
      Field field; 
      boolean numberFound = false; 
     } 
     final Utils utils = new Utils(); 

     for (Field field : fields) { 
      if ("serialVersionUID".equals(field.getName()) || "$jacocoData".equals(field.getName())) { 
       continue; 
      } 

      if (Number.class.isAssignableFrom(field.getType())) { 
       if (utils.numberFound) { 
        throw new IllegalArgumentException(
          embaddebleClassName + " has more then one sequence field: " + field.getName() + ", " 
            + utils.field.getName() + ",..."); 
       } 

       utils.numberFound = true; 
       utils.field = field; 
       sequenceField = field; 

       criteria.setProjection(Projections.max(ID_FIELD_NAME + "." + sequenceField.getName()).as("seq")); 
      } else { 
       criteria.add(Restrictions.eq(ID_FIELD_NAME + "." + field.getName(), getFieldValue(field, id))); 
      } 
     } 
    } 

    private Number castToSequenceNumberType(Number n) { 
     return (Number) sequenceField.getType().cast(n); 
    } 

    private void setFieldValue(Field field, Object value, Object to) { 
     try { 
      field.setAccessible(true); 
      field.set(to, value); 
     } catch (IllegalArgumentException | IllegalAccessException e) { 
      LOG.error(e.getMessage(), e); 
     } 
    } 

    private Object getFieldValue(Field field, Object from) { 
     try { 
      field.setAccessible(true); 
      return field.get(from); 
     } catch (IllegalArgumentException | IllegalAccessException e) { 
      LOG.error(e.getMessage(), e); 
     } 

     return null; 
    } 
} 

Customer.java

package my.app.entities; 

import javax.persistence.Column; 
import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.Id; 
import org.hibernate.annotations.GenericGenerator; 

import my.app.hibernate.SingleKeyEntity; 

@Entity(name = "whatever_entity_name") 
@GenericGenerator(name = "WHATEVER_NAMED_GENERATOR", strategy = "my.app.hibernate.AssignedIdentityGenerator") 
public class Customer implements SingleKeyEntity<Long> { 

    @Id 
    @GeneratedValue(generator = "WHATEVER_NAMED_GENERATOR") 
    private Long id; 
    @Column(nullable = false) 
    private String name; 
} 

CustomerItemsId.java

package my.app.entities; 

import javax.persistence.Embeddable; 
import javax.persistence.JoinColumn; 
import javax.persistence.ManyToOne; 

@Embeddable 
public class CustomerItemsId implements Serializable { 
    private static final long serialVersionUID = 1L; //generate one 

    @ManyToOne 
    @JoinColumn(name = "customer_id") 
    private Customer customer; 
    @ManyToOne 
    @JoinColumn(name = "item_id") 
    private Item item; 
    private Long seq; //name as you wish 
} 

CustomerItems.java

package my.app.entities; 

import javax.persistence.Column; 
import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.Id; 
import org.hibernate.annotations.GenericGenerator; 

import my.app.hibernate.CompositeKeyEntity; 

@Entity(name = "whatever_entity_name") 
@GenericGenerator(name = "WHATEVER_NAMED_GENERATOR", strategy = "my.app.hibernate.AssignedIdentityGenerator") 
public class CustomerItems implements CompositeKeyEntity<CustomerItemsId> { 

    @GeneratedValue(generator = "WHATEVER_NAMED_GENERATOR") 
    private CustomerItems id; 
    @Column(nullable = false) 
    private String randomColumn1; 
    @Column(nullable = false) 
    private String randomColumn2; 
}