当其子对象的状态更改时，父对象的版本不会更改 [英] Version of the parent object does not change when its child object's state changes

问题描述

我正在使用Hibernate3 我有一个简单的一对多关系(父对象具有子对象集) 如果添加/删除了子对象，则会更新父对象的版本，就像子对象的状态已更改一样，父对象的版本也不会得到更新.

I am using Hibernate3 I have a simple one to many relationship(Parent object has as set of child objects) if the child objects are added/removed, the version of the parent object is updated where as if the state of the child object is changed, the version of the parent is not getting updated.

这里是映射- Category.hbm.xml

Here is the mapping - Category.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="net.codejava.hibernate">
<class name="Category" table="CATEGORY">
    <id name="id" column="CATEGORY_ID">
        <generator class="native"/>
    </id>
    <property name="name" column="NAME" />
    <version name="version" type="integer" column="version" unsaved-value="null" />
    <set name="products" inverse="true" cascade="all-delete-orphan">
        <key column="CATEGORY_ID" not-null="true" />
        <one-to-many class="Product"/>
    </set>
</class> 

Product.hbm.xml

Product.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="net.codejava.hibernate">
<class name="Product" table="PRODUCT">
    <id name="id" column="PRODUCT_ID">
        <generator class="native"/>
    </id>
    <version name="version" type="integer" column="version" unsaved-value="null" />
    <property name="name" column="NAME" />
    <property name="description" column="DESCRIPTION" />
    <property name="price" column="PRICE" type="float" />

    <many-to-one name="category" class="Category"
        column="CATEGORY_ID" not-null="true"/>
</class> 

产品更改时，Product.version会正确更新，但Category.version保持不变.

When the Product changes, Product.version is updated properly but the Category.version remains the same.

我认为这是一个跨领域的问题，必须为此提供一个可行的解决方案.我做了很多搜索，却找不到.请帮帮我

I assume this is a cross cutting concern and there has to be a plausible solution for this. I did a lot of searching and could not find one. Please help me out

推荐答案

是的，恐怕这只是休眠方式的限制.唯一的解决方案是在需要进行更改时在两侧都进行更改.

Yes, this is just a limitation of the way hibernate works, I'm afraid. The only solution is to change it on both sides when you need to make a change.

您还可以刷新父级，但请记住，这将影响数据库.

You could also refresh the parent, but bear in mind that that will hit the database.

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