peronalbankbean.java

想学习EJB的同学

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package ejb3.day4;

import javax.ejb.Stateful;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;

/**
 *
 * @author user
 */
@Stateful(mappedName="ejb/personalBank")
public class PeronalBankBean implements PeronalBankRemote, PeronalBankLocal {
    @PersistenceContext(type=PersistenceContextType.EXTENDED)
    private EntityManager em;
    private Account acc;

    public void open(Long accno, String name, float balance) {
        if(accno != null) acc = em.find(Account.class, accno);
        if(acc == null){
            acc = new Account();
            acc.setName(name);
            acc.setBalance(balance);
            em.persist(acc);
        }
    }

    public void deposit(float balance) {
        acc.setBalance(acc.getBalance() + balance);
    }

    public float withdraw(float balance) {
        if(balance > acc.getBalance()) return 0.0f;
        acc.setBalance(acc.getBalance() - balance);
        return balance;
    }

    public float getBalance() {
        return acc.getBalance();
    }
    
    
    
}