我有两个课程(只是重现问题):
public class User
{
public virtual int Id { get; set; }
public virtual string FirstName { get; set; }
public virtual string LastName { get; set; }
public virtual IList<OrgUnitMembership> OrgUnitMemberships { get; set; }
}
public class OrgUnitMembership
{
public virtual int UserId { get; set; }
public virtual int OrgUnitId { get; set; }
public virtual DateTime JoinDate { get; set; }
public virtual DateTime LeaveDate { get; set; }
}
当然,两者都有一个 Fluent NHibernate 地图:
public class UserMapping : ClassMap<User>
{
public UserMapping()
{
Table("Users");
Id(e => e.Id).GeneratedBy.Identity();
Map(e => e.FirstName);
Map(e => e.LastName);
HasMany(x => x.OrgUnitMemberships)
.KeyColumn(TypeReflector<OrgUnitMembership>
.GetPropertyName(p => p.UserId))).ReadOnly().Inverse();
}
}
public class OrgUnitMembershipMapping : ClassMap<OrgUnitMembership>
{
public OrgUnitMembershipMapping()
{
Table("OrgUnitMembership");
CompositeId()
.KeyProperty(x=>x.UserId)
.KeyProperty(x=>x.OrgUnitId);
Map(x => x.JoinDate);
Map(x => x.LeaveDate);
References(oum => oum.OrgUnit)
.Column(TypeReflector<OrgUnitMembership>
.GetPropertyName(oum => oum.OrgUnitId)).ReadOnly();
References(oum => oum.User)
.Column(TypeReflector<OrgUnitMembership>
.GetPropertyName(oum => oum.UserId)).ReadOnly();
}
}
我想做的是根据条件检索一些用户,但我想将 Users 表中的所有列与 OrgUnitMemberships 表中的一些列组合起来,类似于 SQL 查询:
select u.*, m.JoinDate, m.LeaveDate
from Users u inner join OrgUnitMemberships m on u.Id = m.UserId
where m.OrgUnitId = :ouid
我完全迷失了,我尝试了许多不同的选择。使用普通的 SQL 查询几乎可以工作,但是由于 User 类 AliasToBean 中有一些可为空的枚举无法转换,否则包装 SQL 查询将像这样工作:
return
Session
.CreateSQLQuery(sql)
.SetParameter("ouid", orgUnitId)
.SetResultTransformer(Transformers.AliasToBean<UserDTO>())
.List<UserDTO>()
我尝试了下面的代码作为测试(一些不同的变体),但我不确定我在做什么。它部分工作,我得到了 UserDTO 的实例,来自 OrgUnitMembership 的属性(日期)已填充,但来自 User 的所有属性都为空:
User user = null;
OrgUnitMembership membership = null;
UserDTO dto = null;
var users = Session.QueryOver(() => user)
.SelectList(list => list
.Select(() => user.Id)
.Select(() => user.FirstName)
.Select(() => user.LastName))
.JoinAlias(u => u.OrgUnitMemberships, () => membership)
//.JoinQueryOver<OrgUnitMembership>(u => u.OrgUnitMemberships)
.SelectList(list => list
.Select(() => membership.JoinDate).WithAlias(() => dto.JoinDate)
.Select(() => membership.LeaveDate).WithAlias(() => dto.LeaveDate))
.TransformUsing(Transformers.AliasToBean<UserDTO>())
.List<UserDTO>();