Oracle INTERVAL DAYTOSECONDデータ型のNHibernateマッピング

public virtual TimeSpan ActualTimeSpan { get; set; }



class TimeSpanUserType : ImmutableUserType
{
    public override object NullSafeGet(IDataReader rs, string[] names, object owner)
    {
        // Need to do some formatting of TimeSpanTest before it can be parsed
        return TimeSpan.Parse((string)rs[names[0]]);
    }

    public override void NullSafeSet(IDbCommand cmd, object value, int index)
    {
        var timespan = (TimeSpan)value;
        var duration = timespan.Duration();
        var timeSpanstring = string.Format("{0}{1} {2}:{3}:{4}.{5}",
            (timespan.Ticks < 0) ? "-" : "+",
            duration.Days.ToString().PadLeft(2, '0'),
            duration.Hours.ToString().PadLeft(2, '0'),
            duration.Minutes.ToString().PadLeft(2, '0'),
            duration.Seconds.ToString().PadLeft(2, '0'),
            duration.Milliseconds.ToString().PadLeft(3, '0').PadRight(6, '0'));

        NHibernateUtil.String.NullSafeSet(cmd, timeSpanstring, index);
    }

    public override Type ReturnedType
    {
        get { return typeof(TimeSpan); }
    }

    public override SqlType[] SqlTypes
    {
        get { return new[] { SqlTypeFactory.GetString(8) }; }
    }
}

<property name="ActualTimeSpan" column="TIMESPAN_TEST" type="TimeSpanUserType"/>

編集：immutableUserTypeを追加

public abstract class ImmutableUserType : IUserType
{
    public new virtual bool Equals(object x, object y)
    {
        return object.Equals(x, y);
    }

    public virtual int GetHashCode(object x)
    {
        return (x == null) ? 0 : x.GetHashCode();
    }

    public override bool IsMutable
    {
        get { return false; }
    }

    public override object DeepCopy(object value)
    {
        return value;
    }

    public override object Replace(object original, object target, object owner)
    {
        return original;
    }

    public override object Assemble(object cached, object owner)
    {
        return cached;
    }

    public override object Disassemble(object value)
    {
        return value;
    }

    public abstract object NullSafeGet(System.Data.IDataReader rs, string[] names, object owner);

    public abstract void NullSafeSet(System.Data.IDbCommand cmd, object value, int index);
    public abstract Type ReturnedType { get; }

    public abstract SqlType[] SqlTypes { get; }
}