Question

我想查询一个nhibernate映射类，但结果应该是一个未映射的对象。映射和未映射的类如下所示：

[Class(NameType = typeof(ClassA)]
public class ClassA
{
    [Cache(0, Usage = CacheUsage.ReadWrite)]
    [Id(1, Name = "Id", UnsavedValue = null)]
    [Generator(2, Class = "native")]
    public virtual long? Id { get; set; }

    [Property]
    public virtual string PropertyA { get; set; }

    [Property]
    public virtual string PropertyB { get; set; }

}

public class ClassB
{
    public string PropertyA { get; set; }

    public string PropertyB { get; set; }

    public int Number { get; set; }
}

我使用这种方法得到我想要的结果：

public ICollection<ClassB> Group()
{
    var result =
        Session.CreateCriteria(typeof(ClassA)).SetProjection(
            Projections.ProjectionList().Add(Projections.RowCount(), "Number")
                   .Add(Projections.GroupProperty("PropertyA"))
                   .Add(Projections.GroupProperty("PropertyB")));

    return
        (result.List().Cast<IList>().Select(
            entry =>
            new ClassB {
                        Number = (int)entry[0],
                        PropertyA = (string)entry[1],
                        PropertyB = (string)entry[2] 
                    }
             )).ToList();
}

这样可以正常工作，但使用criteria-api？

是不是有更直接的方法

Answer 1

是的，只需做

result.SetResultTransformer(Transformers.AliasToBean<ClassB>());
result.List<ClassB>();

您还需要将属性投影包装为别名 Projections.Alias(Projections.GroupProperty("PropertyA"), "PropertyA")

NHibernate查询使用Criteria-api返回未映射的对象

1 个答案: