如何使用 NHibernate 流畅地映射没有 setter 和 backing 属性的属性？
假设我有以下实体：
public class CalculationInfo
{
public virtual Int64 Id { get; set; }
public virtual decimal Amount { get; set; }
public virtual decimal SomeVariable { get; set; }
public virtual decimal SomeOtherVariable { get; set; }
public virtual decimal CalculatedAmount
{
get
{
decimal result;
// do crazy stuff with Amount, SomeVariable and SomeOtherVariable
return result;
}
}
}
基本上我想使用 NHibernate 读取和写入数据库中的所有字段，但 CalculatedAmount 除外，我只想编写它 。
每个类似的问题和相应的答案都涉及为该值指定一个后备存储，在这种情况下我不会这样做
如何使用 Fluent NHibernate 来完成此任务？
谢谢！
更新：这是我尝试过的方法，以及它导致的错误：
这是我对属性的映射...
Map(x => x.CalculatedAmount)
.ReadOnly();
以及它产生的异常...
无法找到属性的设置器“xxx.CalculationInfo”类中的“CalculatedAmount”
Let's say I have the following entity:
public class CalculationInfo
{
public virtual Int64 Id { get; set; }
public virtual decimal Amount { get; set; }
public virtual decimal SomeVariable { get; set; }
public virtual decimal SomeOtherVariable { get; set; }
public virtual decimal CalculatedAmount
{
get
{
decimal result;
// do crazy stuff with Amount, SomeVariable and SomeOtherVariable
return result;
}
}
}
Basically I want to read and write all of the fields to my database with NHibernate with the exception of CalculatedAmount, which I simply want to write and not read back in.
Every similar issue and corresponding answer has dealt with specifying a backing store for the value, which I won't have in this scenario.
How can I accomplish this using Fluent NHibernate?
Thanks!
UPDATE: Here's what I've tried, and the error it leads to:
Here's my mapping for the property...
Map(x => x.CalculatedAmount)
.ReadOnly();
And the exception it yields...
Could not find a setter for property 'CalculatedAmount' in class 'xxx.CalculationInfo'
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评论（3）
我发现让这个映射在 Fluent NHibernate 中工作的方法是简单地添加 Access 属性：
I figured out that the way get this mapping working in Fluent NHibernate is to simply add the Access Property:
我不使用 Fluent，但在映射中，没有 setter 的持久属性使用
access="readonly"进行映射，因此请查找类似.Readonly()的内容（只读是从模型角度来看的；该值被写入数据库并用于脏检查）
I don't use Fluent, but in the mapping a persisted property with no setter is mapped with
access="readonly", so look for something like.Readonly()(Readonly is from the model perspective; the value is written to the DB and used in dirty checks)
看起来这是一个计算值。如果您可以在任何给定时间计算该值，那么为什么还要存储它呢？
Looks like it's a calculated value. If you can calculate this value at any given time, then why store it at all?