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Person.java |
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package com.morris.entity;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;
@Entity
@Table(name="persons")
public class Person {
@Id
@GeneratedValue
private Integer personId;
@Column(name="person_name",length=50,nullable=false)
private String personName;
/**
* 1对1关联关系配置
* 没有配置mappedBy即为关系保护端
* 配置了optional说明外键不能为空,在另外一方也一样不能为空,不需要再配置了
*/
@OneToOne(cascade=CascadeType.ALL,fetch=FetchType.EAGER,optional=false)
@JoinColumn(name="card_id")
private IDCard idCard;
public Integer getPersonId() {
return personId;
}
public void setPersonId(Integer personId) {
this.personId = personId;
}
public String getPersonName() {
return personName;
}
public void setPersonName(String personName) {
this.personName = personName;
}
public IDCard getIdCard() {
return idCard;
}
public void setIdCard(IDCard idCard) {
this.idCard = idCard;
}
public Person(Integer personId, String personName, IDCard idCard) {
super();
this.personId = personId;
this.personName = personName;
this.idCard = idCard;
}
public Person() {
super();
// TODO Auto-generated constructor stub
}
@Override
public String toString() {
return "Person [personId=" + personId + ", personName=" + personName
+ ", idCard=" + idCard + "]";
}
public Person(String personName) {
super();
this.personName = personName;
}
} |
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IDCard.java |
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package com.morris.entity;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.Table;
@Entity
@Table(name="ID_card")
public class IDCard {
@Id
@GeneratedValue
private Integer cardId;
@Column(name="card_no",length=18,nullable=false)
private String cardNo;
/**
* 指定了 mappedBy="idCard" 为关系被保护方
*/
@OneToOne(cascade={CascadeType.PERSIST,CascadeType.MERGE},fetch=FetchType.EAGER,mappedBy="idCard")
private Person person;
public IDCard(String cardNo) {
super();
this.cardNo = cardNo;
}
public IDCard() {
super();
// TODO Auto-generated constructor stub
}
public IDCard(String cardNo, Person person) {
super();
this.cardNo = cardNo;
this.person = person;
}
@Override
public String toString() {
return "IDCard [cardId=" + cardId + ", cardNo=" + cardNo + ", person="
+ person + "]";
}
public Integer getCardId() {
return cardId;
}
public void setCardId(Integer cardId) {
this.cardId = cardId;
}
public String getCardNo() {
return cardNo;
}
public void setCardNo(String cardNo) {
this.cardNo = cardNo;
}
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
} |
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One2OneTest.java |
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package com.morris.test;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import com.morris.entity.IDCard;
import com.morris.entity.Person;
public class One2OneTest {
private static EntityManagerFactory factory;
private static EntityManager manager;
@BeforeClass
public static void setUpBeforeClass() throws Exception {
factory = Persistence.createEntityManagerFactory("jpaDemo");
manager = factory.createEntityManager();
manager.getTransaction().begin();
}
@Test
public void test() {
Person person = new Person("Morris");
IDCard card = new IDCard("123456789");
person.setIdCard(card);
manager.persist(person);
}
@AfterClass
public static void setUpAfterClass() throws Exception {
manager.getTransaction().commit();
manager.close();
factory.close();
}
}
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