| 27. 10. 1. 使用EJB查询语言检索实体Bean |
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File: Customer.java |
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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;
}
}
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File: EmployeeBean.java |
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import java.util.List;
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");
List<Customer> list = manager.createQuery("FROM Customer res").getResultList();
System.out.println(list.size());
}
}
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File: EmployeeServiceLocal.java |
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import javax.ejb.Local;
import javax.jws.WebParam;
@Local
public interface EmployeeServiceLocal {
public void doAction();
}
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File: EmployeeServiceRemote.java |
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import javax.ejb.Remote;
@Remote
public interface EmployeeServiceRemote {
public void doAction();
}
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File: jndi.properties |
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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
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File: Main.java |
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import javax.ejb.EJB;
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("EmployeeBean/remote");
service.doAction();
}
}
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 Download: EJB-UseEJBQLToRetrieveEntityBean.zip( 4,489 k) |