NHibernate中具有时间戳列比较的LINQ查询

我正在使用Fluent NHibernate的自动映射，并使用以下代码来确保NHibernate不会去除毫秒数：

public class TimestampTypeConvention : IPropertyConvention, IPropertyConventionAcceptance
{
    public void Accept(IAcceptanceCriteria<IPropertyInspector> criteria)
    {
        criteria.Expect(x => x.Type == typeof(DateTime) || x.Type == typeof(DateTimeOffset));
    }

    public void Apply(IPropertyInstance instance)
    {
        instance.CustomType<TimestampType>();
    }
}

如何强制生成的查询使用完全精度

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顺便说一句，

message.EventTag.TimeStamp

是一个

DateTimeOffset

我被日志输出愚弄了：实际的SQL（取自PostgreSQL日志文件）如下所示：

SELECT this_."Id" as column1_0_0_, this_."TagName" as column2_0_0_,
this_."TimeStamp" as column3_0_0_, this_."Value" as column4_0_0_,
this_."QualityTimeStamp" as column5_0_0_, this_."QualitySubstatus" as column6_0_0_,
this_."QualityExtendedSubstatus" as column7_0_0_, this_."QualityLimit" as column8_0_0_,
this_."QualityDataSourceError" as column9_0_0_, this_."QualityTagStatus" as column10_0_0_,
this_."TagType" as column11_0_0_ FROM "TagData" this_
WHERE this_."TimeStamp" = ((E'2013-03-01 16:51:30.509498')::timestamp)

这就是它没有像预期的那样工作的真正原因：PostgreSQL中的

timestamp

列只有微秒的精度，而这里的

DateTimeDiff

的值为16:51:30.5094984，这意味着1/10微秒的精度。保持完全准确的唯一方法似乎是将刻度存储在数据库中

（我感到困惑的另一个原因是，我在不同的线程上或多或少同时收到了来自MassTransit的重复消息，因此检查数据库中的重复消息当然并不总是有效。哦，多线程的奇迹！）

select tagdata0_."Id" as column1_0_, tagdata0_."TagName" as column2_0_,
tagdata0_."TimeStamp" as column3_0_, tagdata0_."Value" as column4_0_,
tagdata0_."QualityTimeStamp" as column5_0_, tagdata0_."QualitySubstatus" as column6_0_,
tagdata0_."QualityExtendedSubstatus" as column7_0_, tagdata0_."QualityLimit" as column8_0_,
tagdata0_."QualityDataSourceError" as column9_0_, tagdata0_."QualityTagStatus" as column10_0_,
tagdata0_."TagType" as column11_0_ from "TagData" tagdata0_
where tagdata0_."TagName"=:p0 and tagdata0_."TimeStamp"=:p1 limit 1;
:p0 = 'VALVE_HW_CMD' [Type: String (0)],
:p1 = 01.03.2013 16:51:30 [Type: DateTime (0)]

SELECT this_."Id" as column1_0_0_, this_."TagName" as column2_0_0_,
this_."TimeStamp" as column3_0_0_, this_."Value" as column4_0_0_,
this_."QualityTimeStamp" as column5_0_0_, this_."QualitySubstatus" as column6_0_0_,
this_."QualityExtendedSubstatus" as column7_0_0_, this_."QualityLimit" as column8_0_0_,
this_."QualityDataSourceError" as column9_0_0_, this_."QualityTagStatus" as column10_0_0_,
this_."TagType" as column11_0_0_ FROM "TagData" this_
WHERE this_."TimeStamp" = ((E'2013-03-01 16:51:30.509498')::timestamp)