Nhibernate总结查询返回指定字段

Posted 2020-08-03 garsonguo

项目查询中，常常需要返回指定的字段，下面是三种Nhibernate的方法
1.linq to Nhibernate
public class NameID
{
public int Id { get; set; }
public string Name { get; set; }
}
var discontinuedProducts = session
.Query<Product>()
.Where(p => p.Discontinued)
.Select(p => new NameID { Id = p.Id, Name = p.Name });
2.Nhibernate（3.0后支持）
var productsLookup = session.QueryOver<Product>()
.Select(p => p.Id, p => p.Name)
.TransformUsing(Transformers.AliasToBean<NameID>())
.List<NameID>();
3.Nhibernate HQL
var productsLookup = session
.CreateQuery("select Id as Id, Name as Name from Product")
.SetResultTransformer(Transformers.AliasToBean<NameID>())
.List<NameID>();