Hibernate双向多对多映射关系配置代码实例

2023-07-13 04:54:03 304

1、实体类

packagecom.yl.bean;

importjava.io.Serializable;
importjava.util.Set;

/**
*商品实体类
*/
publicclassGoodsimplementsSerializable{
privateIntegerid;//商品id
privateStringgoodsName;//商品名
privateDoubleprice;//商品价格
privateStringremark;//备注
privateSetorderSet;//商品所属订单

publicGoods(){
}

publicIntegergetId(){
returnid;
}

publicvoidsetId(Integerid){
this.id=id;
}

publicStringgetGoodsName(){
returngoodsName;
}

publicvoidsetGoodsName(StringgoodsName){
this.goodsName=goodsName;
}

publicDoublegetPrice(){
returnprice;
}

publicvoidsetPrice(Doubleprice){
this.price=price;
}

publicStringgetRemark(){
returnremark;
}

publicvoidsetRemark(Stringremark){
this.remark=remark;
}

publicSetgetOrderSet(){
returnorderSet;
}

publicvoidsetOrderSet(SetorderSet){
this.orderSet=orderSet;
}

@Override
publicStringtoString(){
return"Goods{"+
"goods_id="+id+
",goodsName='"+goodsName+'\''+
",price="+price+
",remark='"+remark+'\''+
",orderSet="+orderSet+
'}';
}
}

packagecom.yl.bean;

importjava.io.Serializable;
importjava.util.Set;

/**
*商品订单实体类
*/
publicclassGoodsOrderimplementsSerializable{
privateIntegerid;//订单id
privateStringorderNo;//订单编号
privateDoubleprice;//订单价格
privateSetgoodsSet;//订单包含的商品

publicGoodsOrder(){
}

publicIntegergetId(){
returnid;
}

publicvoidsetId(Integerid){
this.id=id;
}

publicStringgetOrderNo(){
returnorderNo;
}

publicvoidsetOrderNo(StringorderNo){
this.orderNo=orderNo;
}

publicDoublegetPrice(){
returnprice;
}

publicvoidsetPrice(Doubleprice){
this.price=price;
}

publicSetgetGoodsSet(){
returngoodsSet;
}

publicvoidsetGoodsSet(SetgoodsSet){
this.goodsSet=goodsSet;
}

@Override
publicStringtoString(){
return"GoodsOrder{"+
"id="+id+
",orderNo='"+orderNo+'\''+
",price="+price+
",goodsSet="+goodsSet+
'}';
}
}

2、全局配置文件（hibernate.cfg.xml）





com.mysql.cj.jdbc.Driver
jdbc:mysql://localhost:3306/hibernate?characterEncoding=utf8&serverTimezone=GMT%2B8
root
123456

true

update

3、商品类映射配置文件（Goods.hbm.xml）

4、订单类映射配置文件（GoodsOrder.hbm.xml）

5、测试

@Test
publicvoidaddTest(){
Sessionsession=HibernateUtils.getSession();

Goodsgoods=newGoods();
goods.setGoodsName("小米");
goods.setPrice(3999.0);
goods.setRemark("为发烧而生");

Goodsgoods1=newGoods();
goods1.setRemark("中华有为");
goods1.setPrice(3999.0);
goods1.setGoodsName("华为");

GoodsOrderorder=newGoodsOrder();
order.setOrderNo("001");
order.setPrice(7998.0);

GoodsOrderorder1=newGoodsOrder();
order1.setOrderNo("002");
order1.setPrice(7998.0);

SetorderSet=newHashSet<>();
orderSet.add(order);
orderSet.add(order1);
goods.setOrderSet(orderSet);
goods1.setOrderSet(orderSet);

/*SetorderSet1=newHashSet<>();
orderSet1.add(order1);
goods1.setOrderSet(orderSet1);*/

SetgoodsSet=newHashSet<>();
goodsSet.add(goods);
goodsSet.add(goods1);
//注意这里，只需要一方关联即可（上面已经关联了，所以不需要再次添加商品集合），两方关联会造成主键重复，报错
//order.setGoodsSet(goodsSet);
//order1.setGoodsSet(goodsSet);

Transactiontransaction=session.beginTransaction();

session.save(goods);
session.save(goods1);
session.save(order);
session.save(order1);

transaction.commit();
session.close();

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

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Hibernate双向多对多映射关系配置代码实例

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