NHibernate.QueryException：无法解析属性 - 具有ID的列名

Question

当我尝试使用ICriteria执行以下类时，

if (_userGroupId > 0 && _userId > 0 )
{
   return session.CreateCriteria(typeof(UserUserGroup))
             .Add(Restrictions.Eq("UserGroupID", _userGroupId))
               .Add(Restrictions.Eq("UserID", _userId))
               .Add(Restrictions.Eq("Deleted", false));
}

为班级

public class UserUserGroup
{
    public virtual long UserUserGroupId { get; set; }
    public virtual long UserGroupId { get; set; }
    public virtual long UserId { get; set; }
    public virtual bool Deleted { get; set; }

    public UserUserGroup() {}

    public UserUserGroup(long userGroupId, long userId)
    {
        UserGroupId = userGroupId;
        UserId = userId;
    }

}

使用Mapping，

public void Override(AutoMapping<UserUserGroup> mapping)
    {
        mapping.Id(map => map.UserUserGroupId, "UserUserGroupID").GeneratedBy.HiLo("hibernate_unique_key", "next_hi", "100", "tablename='UserUserGroups'");
        mapping.Map(map => map.UserId,"UserID").Nullable();
        mapping.Map(map => map.UserGroupId,"UserGroupID").Nullable();
        mapping.Map(map => map.Deleted,"Deleted").Nullable();
    }

抛出异常，

  

NHibernate.QueryException：无法解析属性：UserGroupID

如何解决该属性？

Answer 1

不要在查询中指定列名，而是尝试使用类的属性标识符（末尾用小写字母）：

return session.CreateCriteria(typeof(UserUserGroup))
              .Add(Restrictions.Eq("UserGroupId", _userGroupId))
              .Add(Restrictions.Eq("UserId", _userId))
              .Add(Restrictions.Eq("Deleted", false))
              .List();

为了避免将来出现这种问题，我建议您使用QueryOver API，它在编译时提供类型检查：

return session.QueryOver<UserUserGroup>()
              .Where(x => x.UserGroupId == _userGroupId)
              .And(x => x.UserId == _userId)
              .And(x => x.Deleted == false)
              .List();