nhibernate - 如何返回 IList使用 NHibernate 来自 DB 的类型属性值

Question

我需要使用 NHibernate 从数据库返回指定日期的 ACC_INTERVAL_ID 属性值列表，以获取可用的时间间隔。NHibernate 版本是 2.1.2.4000

认证记录：

public class AccreditationRecord : DomainObject
    {
        public AccreditationRecord()
        {
            Date = DateTime.Now;
        }

        /// <summary>
        /// Интервал встречи
        /// </summary>
        public virtual AccreditationTimeIntervalEnum Interval { get; set; }

        /// <summary>
        /// Дата встречи
        /// </summary>
        public virtual DateTime Date { get; set; }

        /// <summary>
        /// Название компании
        /// </summary>
        public virtual string CompanyTitle { get; set; }

        /// <summary>
        /// Название выставки
        /// </summary>
        public virtual string ExhibitionTitle { get; set; }

        /// <summary>
        /// Комментарий аккредитируемого к форме
        /// </summary>
        public virtual string Comment { get; set; }
    }

映射：

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="Mvk.Kvc.Domain" assembly="Mvk.Kvc.Domain">

<class name="AccreditationRecord" table="KVC_ACCREDITATIONS" lazy="false" >
  <id name="ID" column="ID_ACCREDITATIONS" type="Int32" unsaved-value="-1">
    <generator class="identity"/>
  </id>

  <property name="Date" column="ACC_DATE" type="DateTime" />
  <property name="CompanyTitle" column="COMPANYTITLE" type="AnsiString" length="512" />
  <property name="ExhibitionTitle" column="EXHIBITIONTITLE" type="AnsiString" length="512" />
  <property name="Comment" column="COMMENT" type="AnsiString" length="1000" />
  <property name="Interval" column="ACC_INTERVAL_ID" type="AccreditationTimeIntervalEnum" />
</class>

</hibernate-mapping>

我在存储库中的方法：

public virtual IList<int> GetFilledIntervals(DateTime selectedDate)
{
    DetachedCriteria query = DetachedCriteria
        .For(typeof(AccreditationRecord));

    query.Add(Restrictions.Eq("Date", selectedDate));

    query.SetProjection(Projections.Id());
    return  ??????????
}

Answer 1

public virtual IList<int> GetFilledIntervals(DateTime selectedDate)
{
    DetachedCriteria query = DetachedCriteria
    .For(typeof(AccreditationRecord))
    .SetProjection(Projections.Property("Interval"));

    query.Add(Restrictions.Eq("Date", selectedDate));
    return List<int>(query);
}

Answer 2

使用 HN3：

public virtual IList<int> GetFilledIntervals(DateTime selectedDate)
{
    IList<int> result =
    session.QueryOver<AccreditationRecord>()    
        .Where(ar => ar.Date == selectedDate)
        .Select(c => c.Id)
        .List<int>();

    return result;
}