| 27. 14. 2. 实体管理器 |
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File: Customer.java |
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import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.Id;
import javax.persistence.PostRemove;
@Entity
public class Customer implements java.io.Serializable {
private String firstName;
private String lastName;
@Id
private long ssn;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public long getSsn() {
return ssn;
}
public void setSsn(long ssn) {
this.ssn = ssn;
}
}
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File: EmployeeBean.java |
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import javax.ejb.Stateful;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
@Stateful
@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {
@PersistenceContext(unitName="EmployeeService",
type=PersistenceContextType.EXTENDED)
private EntityManager manager;
public void doAction() {
Customer cust = new Customer();
cust.setFirstName("Joe");
manager.persist(cust);
System.out.println("Saved");
manager.joinTransaction();
cust = manager.find(Customer.class,cust.getSsn());
System.out.println(cust.getFirstName());
cust.setFirstName("new Name");
manager.merge(cust);
cust = manager.find(Customer.class,cust.getSsn());
System.out.println(cust.getFirstName());
}
}
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File: EmployeeServiceLocal.java |
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import javax.ejb.Local;
@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-EntityManagerJoinTransaction.zip( 4,488 k) |