使用Dapper点网映射域实体的私有属性 [英] Mapping private attributes of domain entities with Dapper dot net
问题描述
在我的大多数项目中,我都使用nHibernate + Fluent映射,最近我开始与Dapper一起玩,看看是否可以将读取操作移至它.
In most of my projects I use nHibernate + Fluent mapping and recently I've started to play around with Dapper to see if I can move read operations to it.
我遵循DDD方法,因此我的域实体没有任何公共设置者.例如:
I follow DDD approach so my domain entities do not have any public setters. For example:
public class User
{
private int _id;
private string _name;
private IList<Car> _carList;
protected User(){} // Fluent Mapping
public User(string id, string name)
{
// validation
// ...
_id = id;
_name = name;
}
public int Id{ get {return _id;} }
public string Name { get {return _name;} }
public IList<Car> CarList { get {return _carList;}}
}
public class Car
{
private int _id;
private string _brand;
protected Car(){} // Fluent Mapping
public Car(string id, string brand)
{
// validation
// ...
_id = id;
_brand= brand;
}
public int Id{ get {return _id;} }
public string Brand { get {return _brand;} }
}
使用Fluent nHibernate,我可以显示要映射的成员:
With Fluent nHibernate I'm able to reveal members for mapping:
Id(Reveal.Member<User>("_id")).Column("id");
Map(Reveal.Member<User>("_name")).Column("name");
是否可以使用Dapper映射域实体?如果是这样,怎么办?
推荐答案
一个选项是创建一组单独的持久性类,以与Dapper一起使用.例如:UserRecord和CarRecord.记录类将与db表匹配,并将被封装在持久性模块中.Dapper查询将针对此类运行,然后您可以拥有一个单独的持久性工厂,该工厂将组装域实体并将其返回给客户端.
One option is to create a separate set of persistence classes to work with Dapper; for example: UserRecord and CarRecord. The record classes will match db table and will be encapsulate within persistence module. Dapper queries will run against this classes and then you can have a separate persistence factory which will assemble the domain entities and return them back to the client.
小例子:
var carRecord = DbConnection.Query<CarRecord>("select * from cars where id = @id", new {id = 1});
var carEntity = CarFactory.Build(carRecord);
这样可以很好地分离并提供灵活性.
This creates a nice separation and provides flexibility.
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