双向多对一映射注意点

最新推荐文章于 2025-11-23 21:36:02 发布

最新推荐文章于 2025-11-23 21:36:02 发布 · 102 阅读

文章标签：

#Hibernate #Java #.net #XML

本文详细解析了Hibernate框架中一对多关系的配置方法，通过具体示例介绍了如何定义BrandBO品牌与CommodityBO商品之间的关联。包括XML配置文件的具体设置，如外键使用、级联操作等。

不管一方还是多方column 都是来自外键即一的一方，name 都是来自实体中的属性,class 都是是来自对方。如果记住这几点一般不会配错，呵呵，不知道说的对不对，请高手多PP。

一的一方 (BrandBO 品牌):


<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.c35.mingFrame.model.bo">
	<class name = "BrandBO" table="t_brand">
		<id name = "brandId" column="brand_id">
			<generator class="uuid"></generator>
		</id>

		<property name="brandName" column="brand_name" not-null="true" length="100" unique="true" />

		<set name="commoditys">
			<key column="brand_id"></key>
			<one-to-many class="CommodityBO" />
		</set>
	</class>
</hibernate-mapping>

多的一方(CommodityBO 商品)


<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.c35.mingFrame.model.bo">
	<class name = "CommodityBO" table="t_commodity">
		<id name = "commodityId" column="commodity_id">
			<generator class="uuid"></generator>
		</id>



		<property name="commodityName" column="commodity_name" not-null="true" length="100" unique="true" />
		<property name="commodityType" column="commodity_type" />
		<property name="marketPrice" column="market_price" />
		<property name="salePrice" column="sale_price" />
		<property name="stock" column="stock" />
		<property name="description" column="description" />
		<property name="isOnSale" column="is_on_sale" />
		<property name="score" column="score" />

		<many-to-one name="brand" column="brand_id" class="BrandBO" cascade="all"></many-to-one>
	</class>
</hibernate-mapping>