nhibernate - 如何使用可为空属性转换 DTO 中的 SQL 查询？

Question

拥有这样的 DTO:

public class CustomerDTO
{
     public int Id{get; set;}
     public int? Reference {get; set;}
}

我怎样才能从

var q =_session.CreateSQLQuery("SELECT Id, Reference FROM customers")

如果我使用

q.SetResultTransformer(Transformers.AliasToBean<CustomerDTO>)

我收到以下异常:

NHibernate.PropertyAccessException : The type System.Int32 can not be assigned to a property of type System.Nullable`1[System.Int32] setter of Customer.Reference

Answer 1

尝试这个:

var customers = _session.CreateSQLQuery("SELECT Id, Reference FROM customers")
    .AddScalar("Id", NHibernateUtil.Int32)
    .AddScalar("Reference", NHibernateUtil.Int32)
    .SetResultTransformer(Transformers.AliasToBean<CustomerDTO>())
    .List<CustomerDTO>();

引用 here .