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我使用自动映射与功能NHibernate,并用下面的代码,以确保NHibernate的不剥去毫秒时间戳列比较:LINQ查询与NHibernate的
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>();
}
}
这工作得很好,所以数据正确存储在数据库中。
然而,当我运行下面的LINQ查询,我没有得到一个比赛,我希望它:
bool isDuplicate = session.Query<TagData>()
.Any(x => x.TagName == message.EventTag.TagName
&& x.TimeStamp == message.EventTag.TimeStamp.UtcDateTime);
生成的SQL是这样的,并解释了为什么这不起作用:
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)]
如何强制生成的查询使用全精度?
BTW,message.EventTag.TimeStamp
是DateTimeOffset