【发布时间】：2010-12-15 05:32:19
【问题描述】：
我有一个包含一个序列和两个外键的复合主键的表 我能够坚持我的实体类，但它没有按照顺序生成。具有由一个序列和两个外键组成的复合主键的表，maven中的hbm2java给出了以下实体
这里是主要实体
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;
}
}
这是嵌入式 PK 类。
/**
* 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;
}
}
在这里，我希望 Id 是自动生成的... 我只添加了
@NaturalId
和
@GeneratedValue(strategy=GenerationType.SEQUENCE)
我也尝试过使用 GenerationType.AUTO 但没有用。 请提出建议。
【问题讨论】：
-
我怀疑您没有收到答案，因为它无法完成。我有一个类似的用例（三个中的一个主键字段是自动生成的（PostgreSQL 中的 bigserial））并且发现 @GeneratedValue 只能与 @Id 结合使用。
-
令人惊讶的是，鉴于我看到的关于它的帖子数量，它无法完成。我把它归结为 hibernate/jpa/eclipselink 开发人员的顽固，他们不想提供一些常见的用例。 “我们知道得更好”的态度之一。
标签： jpa auto-generate