Java Tutorial/EJB3/Entity Bean

Entity Bean With Compound Key

File: EmployeeBean.java

   <source lang="java">

import javax.ejb.Stateless; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; @Stateless public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {

 @PersistenceContext(unitName="EmployeeService") private EntityManager manager;
 public void doAction(){
   Customer cust = new Customer();
   cust.setLastName("Bond");
   cust.setSsn(123456789L);
   manager.persist(cust);
   
   System.out.println("Saved");
   
 }

}</source>

Entity Bean With Generated ID

File: Customer.java

   <source lang="java">

import java.util.Date; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.Table; import javax.persistence.Temporal; import javax.persistence.TemporalType; @Entity @Table(name = "CUSTOMER_TABLE") public class Customer implements java.io.Serializable {

 private int id;
 private String lastName;
 private String firstName;
 private Date timeCreated = new Date();
 @Id
 @GeneratedValue
 @Column(name = "CUST_ID")
 public int getId() {
   return id;
 }
 public void setId(int pk) {
   id = pk;
 }
 public String getLastName() {
   return lastName;
 }
 public void setLastName(String lastName) {
   this.lastName = lastName;
 }
 public String getFirstName() {
   return firstName;
 }
 public void setFirstName(String firstName) {
   this.firstName = firstName;
 }
 @Temporal(TemporalType.TIME)
 public Date getTimeCreated() {
   return timeCreated;
 }
 public void setTimeCreated(Date time) {
   timeCreated = time;
 }

}</source>

Find Entity With Compound Key

File: Customer.java

   <source lang="java">

import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.IdClass; @Entity @IdClass(CustomerPK.class) public class Customer implements java.io.Serializable {

 private String firstName;
 private String lastName;
 private long ssn;
 public String getFirstName() {
   return firstName;
 }
 public void setFirstName(String firstName) {
   this.firstName = firstName;
 }
 @Id
 public String getLastName() {
   return lastName;
 }
 public void setLastName(String lastName) {
   this.lastName = lastName;
 }
 @Id
 public long getSsn() {
   return ssn;
 }
 public void setSsn(long ssn) {
   this.ssn = ssn;
 }

} class CustomerPK implements java.io.Serializable {

 private String lastName;
 private long ssn;
 public CustomerPK() {
 }
 public CustomerPK(String lastName, long ssn) {
   this.lastName = lastName;
   this.ssn = ssn;
 }
 public String getLastName() {
   return this.lastName;
 }
 public void setLastName(String lastName) {
   this.lastName = lastName;
 }
 public long getSsn() {
   return ssn;
 }
 public void setSsn(long ssn) {
   this.ssn = ssn;
 }
 public boolean equals(Object obj) {
   if (obj == this)
     return true;
   if (!(obj instanceof CustomerPK))
     return false;
   CustomerPK pk = (CustomerPK) obj;
   if (!lastName.equals(pk.lastName))
     return false;
   if (ssn != pk.ssn)
     return false;
   return true;
 }
 public int hashCode() {
   return lastName.hashCode() + (int) ssn;
 }

}</source>

Retrieve Entity Bean

File: Customer.java

   <source lang="java">

import java.util.Date; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.Table; import javax.persistence.Temporal; import javax.persistence.TemporalType; @Entity @Table(name = "CUSTOMER_TABLE") public class Customer implements java.io.Serializable {

 private int id;
 private String lastName;
 private String firstName;
 private Date timeCreated = new Date();
 @Id
 @GeneratedValue
 @Column(name = "CUST_ID")
 public int getId() {
   return id;
 }
 public void setId(int pk) {
   id = pk;
 }
 public String getLastName() {
   return lastName;
 }
 public void setLastName(String lastName) {
   this.lastName = lastName;
 }
 public String getFirstName() {
   return firstName;
 }
 public void setFirstName(String firstName) {
   this.firstName = firstName;
 }
 @Temporal(TemporalType.TIME)
 public Date getTimeCreated() {
   return timeCreated;
 }
 public void setTimeCreated(Date time) {
   timeCreated = time;
 }

}</source>