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| 检索分层实体 |
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File: Employee.java
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.DiscriminatorValue;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.Table;
@Entity
public class Employee extends Customer {
private int employeeId;
public int getEmployeeId() { return employeeId; }
public void setEmployeeId(int id) { employeeId = id; }
}
@Entity
@DiscriminatorValue("CUST")
class Customer extends Person {
private String street;
private String city;
private String state;
private String zip;
public String getStreet() { return street; }
public void setStreet(String street) { this.street = street; }
public String getCity() { return city; }
public void setCity(String city) { this.city = city; }
public String getState() { return state; }
public void setState(String state) { this.state = state; }
public String getZip() { return zip; }
public void setZip(String zip) { this.zip = zip; }
}
@Entity
@Table(name="PERSON_HIERARCHY")
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name="DISCRIMINATOR",
discriminatorType=DiscriminatorType.STRING)
@DiscriminatorValue("PERSON")
class Person implements java.io.Serializable
{
private int id;
private String firstName;
private String lastName;
@Id @GeneratedValue
public int getId() { return id; }
public void setId(int id) { this.id = id; }
public String getFirstName() { return firstName; }
public void setFirstName(String first) { this.firstName = first; }
public String getLastName() { return lastName; }
public void setLastName(String last) { this.lastName = last; }
}
File: EmployeeService.java
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
@Stateless
public class EmployeeService implements EmployeeServiceLocal, EmployeeServiceRemote {
@PersistenceContext(unitName="EmployeeService")
EntityManager em;
public EmployeeService() {
}
public void doAction(){
Person p = new Person();
p.setFirstName("P");
p.setLastName("P");
em.persist(p);
Customer cust = new Customer();
cust.setFirstName("C");
cust.setLastName("C");
cust.setStreet("Street");
cust.setCity("City");
cust.setState("State");
cust.setZip("11111");
em.persist(cust);
Employee employee = new Employee();
employee.setFirstName("E");
employee.setLastName("E");
employee.setStreet("1st Street");
employee.setCity("E City");
employee.setState("E State");
employee.setZip("33333");
employee.setEmployeeId(15);
em.persist(employee);
em.flush();
System.out.println("saved");
List list = em.createQuery("FROM Person p").getResultList();
}
}
File: EmployeeServiceLocal.java
import java.util.Collection;
import javax.ejb.Local;
@Local
public interface EmployeeServiceLocal {
public void doAction();
}
File: EmployeeServiceRemote.java
import java.util.Collection;
import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote{
public void doAction();
}
File: jndi.properties
java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099
File: Main.java
import java.util.Collection;
import javax.naming.InitialContext;
public class Main {
public static void main(String[] a) throws Exception {
EmployeeServiceRemote service = null;
// Context compEnv = (Context) new InitialContext().lookup("java:comp/env");
// service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeService/remote");
service.doAction();
}
}
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 EJB-RetrieveHierarchicalEntities.zip( 4,490 k) |
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