Ich habe eine Tabelle, die zusammengesetzte Primärschlüssel besteht aus einer Sequenz und zwei Fremdschlüssel Ich bin in der Lage, meine Entity-Klasse zu persistent, aber es wird nicht nach der Reihenfolge generiert. Die Tabelle, die zusammengesetzten Primärschlüssel aus einer Sequenz und zwei Fremdschlüssel, hbm2java in Maven hat ergibt folgende EinheitenJPA @EmbeddedId erzeugt keine Sequenz
Hier ist die Haupt Entity
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;
}
}
Hier ist die PK-Klasse eingebettet ist.
/**
* 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;
}
}
Hier erwarte ich die Id automatisch generiert ... ich nur
@NaturalId
und
@GeneratedValue(strategy=GenerationType.SEQUENCE)
Ich habe auch mit GenerationType.AUTO aber haben versucht, hinzugefügt werden nicht arbeiten. Bitte vorschlagen.
Ich vermute, Sie haben nicht empfangen eine Antwort, weil es einfach nicht gemacht werden kann. Ich habe einen ähnlichen Anwendungsfall (ein Primärschlüsselfeld von den dreien ist automatisch generiert (Bigserial in PostgreSQL)) und haben festgestellt, dass @GeneratedValue nur in Verbindung mit @Id verwendet werden kann. –
Es ist erstaunlich, dass es nicht getan werden kann angesichts der Menge an Posts, die ich gesehen habe, nachdem ich danach gefragt habe.Ich habe es auf Unnachgiebigkeit seitens der Entwickler von Hibernate/Jpa/Eclipselink abgesehen, die nicht für einen etwas verbreiteten Anwendungsfall sorgen wollen. Eine der "wir wissen besser" Einstellungen. – BillR