如何使用公式和列规范映射 NHibernate 实体属性
我试图以这样的方式映射实体属性，将其值写入数据库列，但使用公式检索其值。
为了关注实际问题，我简化了示例。实际上，该公式有点复杂，并且使用 NHibernate 过滤器。
<many-to-one cascade="all" class="Thing" lazy="false" name="MyThing"
formula="(SELECT Things.Value FROM Things WHERE Things.Id = MyThingId)">
<column name="MyThingId" />
</many-to-one>
但是，除非我删除
我将如何修复此映射以便 NHibernate 使用该公式？
I'm trying to map an entity property in such way that it writes its value to a database column but retrieves its value using a formula.
To focus on the actual issue, I have simplified the example. In reality the formula is a bit more complex and is using an NHibernate filter.
<many-to-one cascade="all" class="Thing" lazy="false" name="MyThing"
formula="(SELECT Things.Value FROM Things WHERE Things.Id = MyThingId)">
<column name="MyThingId" />
</many-to-one>
The formula is ignored however, unless I remove the <column name="MyThingId" /> line.
How would I fix this mapping in order to have NHibernate use the formula?
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评论（1）
我认为不可能完全做到你正在尝试的事情。
为什么不把财产一分为二呢？一个是公式的只读属性，另一个是直接列映射的读/写...
如果您仍然需要单个访问点，您可以映射第三个被忽略的属性，该属性实现它的
get和使用前两个属性设置访问器。I don't think it's possible to do exactly what you are trying.
Why not split the property in two? One readonly for the formula and the other read/write with a direct column mapping...
If you still want a single access point, you can map a third ignored propery that implements it's
getandsetaccessors with the two first properties.