Hibernate一对一外键双向关联(Annotation配置篇)

最新推荐文章于 2025-08-15 22:56:20 发布

最新推荐文章于 2025-08-15 22:56:20 发布 · 69 阅读

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#java

本文详细介绍了如何使用Java和Hibernate实现一对一关联关系，包括实体类的定义、数据库表的设计以及数据的保存和查询操作。

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Husband.java

packagecom.one2one.bean;

importjavax.persistence.CascadeType;
importjavax.persistence.Column;
importjavax.persistence.Entity;
importjavax.persistence.GeneratedValue;
importjavax.persistence.GenerationType;
importjavax.persistence.Id;
importjavax.persistence.OneToOne;
importjavax.persistence.Table;

@Entity
@Table(name="husband",catalog="Hibernate_One2One_fk")
publicclassHusband{

privateintid;
privateStringname;
privateWifewife;
@Id
@Column(name="id")
@GeneratedValue(strategy=GenerationType.AUTO)
publicintgetId(){
returnid;
}
publicvoidsetId(intid){
this.id=id;
}
@Column(name="name")
publicStringgetName(){
returnname;
}
publicvoidsetName(Stringname){
this.name=name;
}
@OneToOne(cascade=CascadeType.ALL,mappedBy="husband")
publicWifegetWife(){
returnwife;
}
publicvoidsetWife(Wifewife){
this.wife=wife;
}

}

Wife.java

packagecom.one2one.bean;

importjavax.persistence.CascadeType;
importjavax.persistence.Column;
importjavax.persistence.Entity;
importjavax.persistence.GeneratedValue;
importjavax.persistence.GenerationType;
importjavax.persistence.Id;
importjavax.persistence.JoinColumn;
importjavax.persistence.OneToOne;
importjavax.persistence.Table;

@Entity
@Table(name="wife",catalog="Hibernate_One2One_fk")
publicclassWife{

privateintid;
privateStringname;
privateHusbandhusband;
@Id
@Column(name="id")
@GeneratedValue(strategy=GenerationType.AUTO)
publicintgetId(){
returnid;
}
publicvoidsetId(intid){
this.id=id;
}
@Column(name="name")
publicStringgetName(){
returnname;
}
publicvoidsetName(Stringname){
this.name=name;
}
@OneToOne(cascade=CascadeType.ALL)
@JoinColumn(name="husband_id")
publicHusbandgetHusband(){
returnhusband;
}
publicvoidsetHusband(Husbandhusband){
this.husband=husband;
}

}

导出的sql

createtableHibernate_One2One_fk.husband(
idintegernotnullauto_increment,
namevarchar(255),
primarykey(id)
)

createtableHibernate_One2One_fk.wife(
idintegernotnullauto_increment,
namevarchar(255),
husband_idinteger,
primarykey(id)
)

altertableHibernate_One2One_fk.wife
addindexFK37AF119039AEDD(husband_id),
addconstraintFK37AF119039AEDD
foreignkey(husband_id)
referencesHibernate_One2One_fk.husband(id)

测试代码

@Test
publicvoidsave(){
Sessionsession=HibernateSessionFactory.getSession();
Transactiontransaction=session.beginTransaction();
try{
transaction.begin();
Husbandhusband=newHusband();
husband.setName("张三");
session.save(husband);
Wifewife=newWife();
wife.setName("如花");
wife.setHusband(husband);
session.save(wife);
transaction.commit();
}catch(HibernateExceptione){
e.printStackTrace();
}
}

@Test
publicvoidselect(){
Sessionsession=HibernateSessionFactory.getSession();
Husbandhusband=(Husband)session.get(Husband.class,1);
System.out.println(husband.getName());
System.out.println(husband.getWife().getName());
}