一、代码

1.

 package org.jpwh.model.inheritance.associations.onetomany;

 import org.jpwh.model.Constants;

 import javax.persistence.*;
import javax.validation.constraints.NotNull; // Can not be @MappedSuperclass when it's a target class in associations!
@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public abstract class BillingDetails { @Id
@GeneratedValue(generator = Constants.ID_GENERATOR)
protected Long id; @ManyToOne(fetch = FetchType.LAZY)
protected User user; @NotNull
protected String owner; protected BillingDetails() {
} protected BillingDetails(String owner) {
this.owner = owner;
} public Long getId() {
return id;
} public String getOwner() {
return owner;
} public void setOwner(String owner) {
this.owner = owner;
} public User getUser() {
return user;
} public void setUser(User user) {
this.user = user;
} public void pay(int amount) {
// NOOP
} // ...
}

2.

 package org.jpwh.model.inheritance.associations.onetomany;

 import javax.persistence.Entity;
import javax.validation.constraints.NotNull; @Entity
public class BankAccount extends BillingDetails { @NotNull
protected String account; @NotNull
protected String bankname; @NotNull
protected String swift; public BankAccount() {
super();
} public BankAccount(String owner, String account, String bankname, String swift) {
super(owner);
this.account = account;
this.bankname = bankname;
this.swift = swift;
} public String getAccount() {
return account;
} public void setAccount(String account) {
this.account = account;
} public String getBankname() {
return bankname;
} public void setBankname(String bankname) {
this.bankname = bankname;
} public String getSwift() {
return swift;
} public void setSwift(String swift) {
this.swift = swift;
}
}

3.

 package org.jpwh.model.inheritance.associations.onetomany;

 import javax.persistence.Entity;
import javax.validation.constraints.NotNull; @Entity
public class CreditCard extends BillingDetails { @NotNull
protected String cardNumber; @NotNull
protected String expMonth; @NotNull
protected String expYear; public CreditCard() {
super();
} public CreditCard(String owner, String cardNumber, String expMonth, String expYear) {
super(owner);
this.cardNumber = cardNumber;
this.expMonth = expMonth;
this.expYear = expYear;
} public String getCardNumber() {
return cardNumber;
} public void setCardNumber(String cardNumber) {
this.cardNumber = cardNumber;
} public String getExpMonth() {
return expMonth;
} public void setExpMonth(String expMonth) {
this.expMonth = expMonth;
} public String getExpYear() {
return expYear;
} public void setExpYear(String expYear) {
this.expYear = expYear;
} }

4.

 package org.jpwh.model.inheritance.associations.onetomany;

 import org.jpwh.model.Constants;

 import javax.persistence.*;
import javax.validation.constraints.NotNull;
import java.util.HashSet;
import java.util.Set; @Entity
@Table(name = "USERS")
public class User { @Id
@GeneratedValue(generator = Constants.ID_GENERATOR)
protected Long id; @NotNull
protected String username; @OneToMany(mappedBy = "user")
protected Set<BillingDetails> billingDetails = new HashSet<>(); public User() {
} public User(String username) {
this.username = username;
} public Long getId() {
return id;
} public String getUsername() {
return username;
} public void setUsername(String username) {
this.username = username;
} public Set<BillingDetails> getBillingDetails() {
return billingDetails;
} public void setBillingDetails(Set<BillingDetails> billingDetails) {
this.billingDetails = billingDetails;
} // ...
}

5.测试

 package org.jpwh.test.inheritance;

 import org.jpwh.env.JPATest;
import org.jpwh.model.inheritance.associations.onetomany.BankAccount;
import org.jpwh.model.inheritance.associations.onetomany.BillingDetails;
import org.jpwh.model.inheritance.associations.onetomany.CreditCard;
import org.jpwh.model.inheritance.associations.onetomany.User;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test; import javax.persistence.EntityManager;
import javax.transaction.UserTransaction; import static org.testng.Assert.assertEquals; public class PolymorphicOneToMany extends JPATest { @Override
public void configurePersistenceUnit() throws Exception {
configurePersistenceUnit("PolymorphicOneToManyPU");
} @Test
public void storeAndLoadItemBids() throws Exception {
UserTransaction tx = TM.getUserTransaction();
try {
tx.begin();
EntityManager em = JPA.createEntityManager(); BankAccount ba = new BankAccount(
"Jane Roe", "445566", "One Percent Bank Inc.", "999"
);
CreditCard cc = new CreditCard(
"John Doe", "1234123412341234", "06", "2015"
);
User johndoe = new User("johndoe"); johndoe.getBillingDetails().add(ba);
ba.setUser(johndoe); johndoe.getBillingDetails().add(cc);
cc.setUser(johndoe); em.persist(ba);
em.persist(cc);
em.persist(johndoe); tx.commit();
em.close(); Long USER_ID = johndoe.getId(); tx.begin();
em = JPA.createEntityManager();
{
User user = em.find(User.class, USER_ID); for (BillingDetails billingDetails : user.getBillingDetails()) {
billingDetails.pay(123);
}
assertEquals(user.getBillingDetails().size(), 2);
} tx.commit();
em.close(); } finally {
TM.rollback();
}
} }

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