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Order.java |
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package com.morris.entity;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
@Entity
@Table(name="orders")
public class Order {
@Id
@Column(name="order_id",length=32)
private String orderId;
@Column(name="order_name",length=50)
private String orderName;
/**
* OneToMany:1對多的配置
* mappedBy="order":指定由多的1方的order屬性保護關聯關系
*
*/
@OneToMany(cascade={CascadeType.REFRESH,CascadeType.MERGE,CascadeType.REMOVE,CascadeType.PERSIST},fetch=FetchType.LAZY,mappedBy="order")
private Set<OrderItem> orderItems;
public Order(String orderId, String orderName, Set<OrderItem> orderItems) {
super();
this.orderId = orderId;
this.orderName = orderName;
this.orderItems = orderItems;
}
public Set<OrderItem> getOrderItems() {
return orderItems;
}
public void setOrderItems(Set<OrderItem> orderItems) {
this.orderItems = orderItems;
}
public Order() {
super();
// TODO Auto-generated constructor stub
}
public Order(String orderId, String orderName) {
super();
this.orderId = orderId;
this.orderName = orderName;
}
@Override
public String toString() {
return "Order [orderId=" + orderId + ", orderName=" + orderName + "]";
}
public String getOrderId() {
return orderId;
}
public void setOrderId(String orderId) {
this.orderId = orderId;
}
public String getOrderName() {
return orderName;
}
public void setOrderName(String orderName) {
this.orderName = orderName;
}
}
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OrderItem.java |
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package com.morris.entity;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
@Entity
@Table(name="order_item")
public class OrderItem {
@Id
@GeneratedValue
@Column(name="order_item_id")
private Integer orderItemId;
@Column(name="product_name",length=50,nullable=false)
private String productName;
@Column(name="product_price",nullable=false)
private Double productPrice;
/**
* ManyToOne：多對1的配置
* cascade(級聯)：all(所有)，merge(更新)，refresh(查詢)，persistence(保存)，remove(刪除)
* fetch: eager:立即加載 one的1方默許是立即加載
* lazy:懶加載 many的1方默許是懶加載
* optional:是不是可選,外鍵是不是允許為空
*
* JoinColumn:指定外鍵名
*
*/
@ManyToOne(cascade={CascadeType.MERGE,CascadeType.REFRESH},fetch=FetchType.EAGER,optional=false)
@JoinColumn(name="order_id")
private Order order;
public OrderItem() {
super();
// TODO Auto-generated constructor stub
}
@Override
public String toString() {
return "OrderItem [orderItemId=" + orderItemId + ", productName="
+ productName + ", productPrice=" + productPrice + ", order="
+ order + "]";
}
public Integer getOrderItemId() {
return orderItemId;
}
public void setOrderItemId(Integer orderItemId) {
this.orderItemId = orderItemId;
}
public String getProductName() {
return productName;
}
public void setProductName(String productName) {
this.productName = productName;
}
public Double getProductPrice() {
return productPrice;
}
public void setProductPrice(Double productPrice) {
this.productPrice = productPrice;
}
public Order getOrder() {
return order;
}
public void setOrder(Order order) {
this.order = order;
}
public OrderItem(String productName,
Double productPrice) {
super();
this.productName = productName;
this.productPrice = productPrice;
}
}
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One2ManyTest.java |
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package com.morris.test;
import java.util.HashSet;
import java.util.Set;
import java.util.UUID;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import com.morris.entity.Order;
import com.morris.entity.OrderItem;
public class One2ManyTest {
private static EntityManagerFactory factory;
private static EntityManager manager;
@BeforeClass
public static void setUpBeforeClass() throws Exception {
factory = Persistence.createEntityManagerFactory("jpaDemo");
manager = factory.createEntityManager();
manager.getTransaction().begin();
}
@Test
public void test() {
Order order = new Order(UUID.randomUUID().toString(), "體育商品定單");
OrderItem orderItem1 = new OrderItem("足球",120.0);
OrderItem orderItem2 = new OrderItem("籃球",66.0);
OrderItem orderItem3 = new OrderItem("羽毛球",118.0);
//1定要設置這個,由于orderItem負責保護關聯關系
orderItem1.setOrder(order);
orderItem2.setOrder(order);
orderItem3.setOrder(order);
Set<OrderItem> set = new HashSet<>();
set.add(orderItem1);
set.add(orderItem2);
set.add(orderItem3);
order.setOrderItems(set);
manager.persist(order);
}
@AfterClass
public static void setUpAfterClass() throws Exception {
manager.getTransaction().commit();
manager.close();
factory.close();
}
}
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