我是一个Hibernate的新手。我尝试在以下代码中创建Person和PersonDetail实体之间的一对一映射:
@Entity
public class Person {
private int personId;
private String personName;
private PersonDetail personDetail;
@OneToOne(mappedBy="person")
public PersonDetail getPersonDetail() {
return personDetail;
}
public void setPersonDetail(PersonDetail personDetail) {
this.personDetail = personDetail;
}
@Id
@GeneratedValue
public int getPersonId() {
return personId;
}
public void setPersonId(int personId) {
this.personId = personId;
}
public String getPersonName() {
return personName;
}
public void setPersonName(String personName) {
this.personName = personName;
}
}
@Entity
public class PersonDetail {
private int personDetailId;
private String zipCode;
private String job;
private double income;
private Person person;
@OneToOne(cascade=CascadeType.ALL, fetch=FetchType.EAGER)
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
@Id
@GeneratedValue
public int getPersonDetailId() {
return personDetailId;
}
public void setPersonDetailId(int personDetailId) {
this.personDetailId = personDetailId;
}
public String getZipCode() {
return zipCode;
}
public void setZipCode(String zipCode) {
this.zipCode = zipCode;
}
public String getJob() {
return job;
}
public void setJob(String job) {
this.job = job;
}
public double getIncome() {
return income;
}
public void setIncome(double income) {
this.income = income;
}
}
我希望PersonDetail成为拥有实体(我知道反过来也是正确的,但我只是想测试)。我不明白的是在Person实体中放置的mappedBy属性的用途。如果我删除它,就会得到以下错误消息:“Could not determine type for: com.hibernate.onetoonemapping.PersonDetail, at table: Person, for columns: [org.hibernate.mapping.Column(personDetail)]”。这个mappedBy属性是什么作用?我已经读到mappedBy属性放置在非拥有端。但它具体做什么呢?