?? orderdaobean.java
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package com.foshanshop.ejb3.impl;
import java.util.List;
import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import com.foshanshop.ejb3.OrderDAO;
import com.foshanshop.ejb3.bean.Order;
@Stateless
@Remote (OrderDAO.class)
public class OrderDAOBean implements OrderDAO {
@PersistenceContext protected EntityManager em;
public void insertOrder(Order order){
em.persist(order);
}
public Order getOrderByID(Integer orderid) {
Order order = em.find(Order.class, orderid);
order.getOrderItems().size();
//因為是延遲加載,通過執行size()這種方式獲取訂單下的所有訂單項
return order;
}
@SuppressWarnings("unchecked")
public List<Order> getAllOrder() {
Query query = em.createQuery("select DISTINCT o from Order o inner join fetch o.orderItems order by o.orderid");
return (List<Order>) query.getResultList();
}
}
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