EF对应null的处理
原来的代码是
if (string.IsNullOrWhiteSpace(seal)) seal = null;
ctx.Terminal.FirstOrDefault(ent=>ent.Seal==seal)
当seal是null时成长的sql语句如下，采用=null执行结果不是需要的
exec sp_executesql N'SELECT TOP (1)
[Extent1].[id] AS [id],
[Extent1].[Terminal] AS [Terminal],
[Extent1].[Die] AS [Die],
[Extent1].[WireGauge] AS [WireGauge],
[Extent1].[NormCCH] AS [NormCCH],
[Extent1].[ActualCCH] AS [ActualCCH],
[Extent1].[NormCCW] AS [NormCCW],
[Extent1].[ActualCCW] AS [ActualCCW],
[Extent1].[NormICH] AS [NormICH],
[Extent1].[ActualICH] AS [ActualICH],
[Extent1].[NormICW] AS [NormICW],
[Extent1].[ActualICW] AS [ActualICW],
[Extent1].[NormPullForce] AS [NormPullForce],
[Extent1].[UpPullForce] AS [UpPullForce],
[Extent1].[DownPullForce] AS [DownPullForce],
[Extent1].[ActualPullForce] AS [ActualPullForce],
[Extent1].[WireType] AS [WireType],
[Extent1].[Seal] AS [Seal],
[Extent1].[Supplier] AS [Supplier],
[Extent1].[Project] AS [Project],
[Extent1].[StripLength] AS [StripLength],
[Extent1].[coreup] AS [coreup],
[Extent1].[coredown] AS [coredown],
[Extent1].[platicup] AS [platicup],
[Extent1].[platicdown] AS [platicdown],
[Extent1].[sample] AS [sample],
[Extent1].[Tester] AS [Tester],
[Extent1].[picture] AS [picture],
[Extent1].[testdate] AS [testdate],
[Extent1].[date] AS [date],
[Extent1].[yj] AS [yj],
[Extent1].[standardY1] AS [standardY1],
[Extent1].[standardY2] AS [standardY2],
[Extent1].[standardY3] AS [standardY3],
[Extent1].[standardY4] AS [standardY4],
[Extent1].[standardY5] AS [standardY5],
[Extent1].[standardY6] AS [standardY6],
[Extent1].[standardY7] AS [standardY7],
[Extent1].[standardY8] AS [standardY8],
[Extent1].[standardY9] AS [standardY9],
[Extent1].[standardY10] AS [standardY10],
[Extent1].[standardN1] AS [standardN1],
[Extent1].[standardN2] AS [standardN2],
[Extent1].[standardN3] AS [standardN3],
[Extent1].[standardN4] AS [standardN4],
[Extent1].[standardN5] AS [standardN5],
[Extent1].[standardN6] AS [standardN6],
[Extent1].[standardN7] AS [standardN7],
[Extent1].[standardN8] AS [standardN8],
[Extent1].[standardN9] AS [standardN9],
[Extent1].[standardN10] AS [standardN10],
[Extent1].[plug] AS [plug],
[Extent1].[socket] AS [socket],
[Extent1].[remark1] AS [remark1],
[Extent1].[remark] AS [remark],
[Extent1].[CCHUp] AS [CCHUp],
[Extent1].[CCWUp] AS [CCWUp],
[Extent1].[ICHUp] AS [ICHUp],
[Extent1].[ICWUp] AS [ICWUp],
[Extent1].[CCHDown] AS [CCHDown],
[Extent1].[CCWDown] AS [CCWDown],
[Extent1].[ICHDown] AS [ICHDown],
[Extent1].[ICWDown] AS [ICWDown],
[Extent1].[CCH] AS [CCH],
[Extent1].[CCW] AS [CCW],
[Extent1].[ICH] AS [ICH],
[Extent1].[ICW] AS [ICW]
FROM (SELECT
[Terminal].[id] AS [id],
[Terminal].[Terminal] AS [Terminal],
[Terminal].[Die] AS [Die],
[Terminal].[WireGauge] AS [WireGauge],
[Terminal].[NormCCH] AS [NormCCH],
[Terminal].[ActualCCH] AS [ActualCCH],
[Terminal].[NormCCW] AS [NormCCW],
[Terminal].[ActualCCW] AS [ActualCCW],
[Terminal].[NormICH] AS [NormICH],
[Terminal].[ActualICH] AS [ActualICH],
[Terminal].[NormICW] AS [NormICW],
[Terminal].[ActualICW] AS [ActualICW],
[Terminal].[NormPullForce] AS [NormPullForce],
[Terminal].[UpPullForce] AS [UpPullForce],
[Terminal].[DownPullForce] AS [DownPullForce],
[Terminal].[ActualPullForce] AS [ActualPullForce],
[Terminal].[WireType] AS [WireType],
[Terminal].[Seal] AS [Seal],
[Terminal].[Supplier] AS [Supplier],
[Terminal].[Project] AS [Project],
[Terminal].[StripLength] AS [StripLength],
[Terminal].[coreup] AS [coreup],
[Terminal].[coredown] AS [coredown],
[Terminal].[platicup] AS [platicup],
[Terminal].[platicdown] AS [platicdown],
[Terminal].[sample] AS [sample],
[Terminal].[Tester] AS [Tester],
[Terminal].[picture] AS [picture],
[Terminal].[testdate] AS [testdate],
[Terminal].[date] AS [date],
[Terminal].[yj] AS [yj],
[Terminal].[standardY1] AS [standardY1],
[Terminal].[standardY2] AS [standardY2],
[Terminal].[standardY3] AS [standardY3],
[Terminal].[standardY4] AS [standardY4],
[Terminal].[standardY5] AS [standardY5],
[Terminal].[standardY6] AS [standardY6],
[Terminal].[standardY7] AS [standardY7],
[Terminal].[standardY8] AS [standardY8],
[Terminal].[standardY9] AS [standardY9],
[Terminal].[standardY10] AS [standardY10],
[Terminal].[standardN1] AS [standardN1],
[Terminal].[standardN2] AS [standardN2],
[Terminal].[standardN3] AS [standardN3],
[Terminal].[standardN4] AS [standardN4],
[Terminal].[standardN5] AS [standardN5],
[Terminal].[standardN6] AS [standardN6],
[Terminal].[standardN7] AS [standardN7],
[Terminal].[standardN8] AS [standardN8],
[Terminal].[standardN9] AS [standardN9],
[Terminal].[standardN10] AS [standardN10],
[Terminal].[plug] AS [plug],
[Terminal].[socket] AS [socket],
[Terminal].[remark1] AS [remark1],
[Terminal].[remark] AS [remark],
[Terminal].[CCHUp] AS [CCHUp],
[Terminal].[CCWUp] AS [CCWUp],
[Terminal].[ICHUp] AS [ICHUp],
[Terminal].[ICWUp] AS [ICWUp],
[Terminal].[CCHDown] AS [CCHDown],
[Terminal].[CCWDown] AS [CCWDown],
[Terminal].[ICHDown] AS [ICHDown],
[Terminal].[ICWDown] AS [ICWDown],
[Terminal].[CCH] AS [CCH],
[Terminal].[CCW] AS [CCW],
[Terminal].[ICH] AS [ICH],
[Terminal].[ICW] AS [ICW]
FROM [dbo].[Terminal] AS [Terminal]) AS [Extent1]
WHERE ([Extent1].[Terminal] = @p__linq__0) AND ([Extent1].[WireGauge] = @p__linq__1) AND ([Extent1].[Die] LIKE N''Q%'') AND ([Extent1].[WireType] = @p__linq__2) AND ([Extent1].[Seal] = @p__linq__3)',N'@p__linq__0 nvarchar(4000),@p__linq__1 nvarchar(4000),@p__linq__2 nvarchar(4000),@p__linq__3 nvarchar(4000)',@p__linq__0=N'968221-1',@p__linq__1=N'0.50',@p__linq__2=N'GHB2',@p__linq__3=N'NULL'
换成下面代码后生成的语句变成了Is null 正确匹配了结果
exec sp_executesql N'SELECT TOP (1)
[Extent1].[id] AS [id],
[Extent1].[Terminal] AS [Terminal],
[Extent1].[Die] AS [Die],
[Extent1].[WireGauge] AS [WireGauge],
[Extent1].[NormCCH] AS [NormCCH],
[Extent1].[ActualCCH] AS [ActualCCH],
[Extent1].[NormCCW] AS [NormCCW],
[Extent1].[ActualCCW] AS [ActualCCW],
[Extent1].[NormICH] AS [NormICH],
[Extent1].[ActualICH] AS [ActualICH],
[Extent1].[NormICW] AS [NormICW],
[Extent1].[ActualICW] AS [ActualICW],
[Extent1].[NormPullForce] AS [NormPullForce],
[Extent1].[UpPullForce] AS [UpPullForce],
[Extent1].[DownPullForce] AS [DownPullForce],
[Extent1].[ActualPullForce] AS [ActualPullForce],
[Extent1].[WireType] AS [WireType],
[Extent1].[Seal] AS [Seal],
[Extent1].[Supplier] AS [Supplier],
[Extent1].[Project] AS [Project],
[Extent1].[StripLength] AS [StripLength],
[Extent1].[coreup] AS [coreup],
[Extent1].[coredown] AS [coredown],
[Extent1].[platicup] AS [platicup],
[Extent1].[platicdown] AS [platicdown],
[Extent1].[sample] AS [sample],
[Extent1].[Tester] AS [Tester],
[Extent1].[picture] AS [picture],
[Extent1].[testdate] AS [testdate],
[Extent1].[date] AS [date],
[Extent1].[yj] AS [yj],
[Extent1].[standardY1] AS [standardY1],
[Extent1].[standardY2] AS [standardY2],
[Extent1].[standardY3] AS [standardY3],
[Extent1].[standardY4] AS [standardY4],
[Extent1].[standardY5] AS [standardY5],
[Extent1].[standardY6] AS [standardY6],
[Extent1].[standardY7] AS [standardY7],
[Extent1].[standardY8] AS [standardY8],
[Extent1].[standardY9] AS [standardY9],
[Extent1].[standardY10] AS [standardY10],
[Extent1].[standardN1] AS [standardN1],
[Extent1].[standardN2] AS [standardN2],
[Extent1].[standardN3] AS [standardN3],
[Extent1].[standardN4] AS [standardN4],
[Extent1].[standardN5] AS [standardN5],
[Extent1].[standardN6] AS [standardN6],
[Extent1].[standardN7] AS [standardN7],
[Extent1].[standardN8] AS [standardN8],
[Extent1].[standardN9] AS [standardN9],
[Extent1].[standardN10] AS [standardN10],
[Extent1].[plug] AS [plug],
[Extent1].[socket] AS [socket],
[Extent1].[remark1] AS [remark1],
[Extent1].[remark] AS [remark],
[Extent1].[CCHUp] AS [CCHUp],
[Extent1].[CCWUp] AS [CCWUp],
[Extent1].[ICHUp] AS [ICHUp],
[Extent1].[ICWUp] AS [ICWUp],
[Extent1].[CCHDown] AS [CCHDown],
[Extent1].[CCWDown] AS [CCWDown],
[Extent1].[ICHDown] AS [ICHDown],
[Extent1].[ICWDown] AS [ICWDown],
[Extent1].[CCH] AS [CCH],
[Extent1].[CCW] AS [CCW],
[Extent1].[ICH] AS [ICH],
[Extent1].[ICW] AS [ICW]
FROM (SELECT
[Terminal].[id] AS [id],
[Terminal].[Terminal] AS [Terminal],
[Terminal].[Die] AS [Die],
[Terminal].[WireGauge] AS [WireGauge],
[Terminal].[NormCCH] AS [NormCCH],
[Terminal].[ActualCCH] AS [ActualCCH],
[Terminal].[NormCCW] AS [NormCCW],
[Terminal].[ActualCCW] AS [ActualCCW],
[Terminal].[NormICH] AS [NormICH],
[Terminal].[ActualICH] AS [ActualICH],
[Terminal].[NormICW] AS [NormICW],
[Terminal].[ActualICW] AS [ActualICW],
[Terminal].[NormPullForce] AS [NormPullForce],
[Terminal].[UpPullForce] AS [UpPullForce],
[Terminal].[DownPullForce] AS [DownPullForce],
[Terminal].[ActualPullForce] AS [ActualPullForce],
[Terminal].[WireType] AS [WireType],
[Terminal].[Seal] AS [Seal],
[Terminal].[Supplier] AS [Supplier],
[Terminal].[Project] AS [Project],
[Terminal].[StripLength] AS [StripLength],
[Terminal].[coreup] AS [coreup],
[Terminal].[coredown] AS [coredown],
[Terminal].[platicup] AS [platicup],
[Terminal].[platicdown] AS [platicdown],
[Terminal].[sample] AS [sample],
[Terminal].[Tester] AS [Tester],
[Terminal].[picture] AS [picture],
[Terminal].[testdate] AS [testdate],
[Terminal].[date] AS [date],
[Terminal].[yj] AS [yj],
[Terminal].[standardY1] AS [standardY1],
[Terminal].[standardY2] AS [standardY2],
[Terminal].[standardY3] AS [standardY3],
[Terminal].[standardY4] AS [standardY4],
[Terminal].[standardY5] AS [standardY5],
[Terminal].[standardY6] AS [standardY6],
[Terminal].[standardY7] AS [standardY7],
[Terminal].[standardY8] AS [standardY8],
[Terminal].[standardY9] AS [standardY9],
[Terminal].[standardY10] AS [standardY10],
[Terminal].[standardN1] AS [standardN1],
[Terminal].[standardN2] AS [standardN2],
[Terminal].[standardN3] AS [standardN3],
[Terminal].[standardN4] AS [standardN4],
[Terminal].[standardN5] AS [standardN5],
[Terminal].[standardN6] AS [standardN6],
[Terminal].[standardN7] AS [standardN7],
[Terminal].[standardN8] AS [standardN8],
[Terminal].[standardN9] AS [standardN9],
[Terminal].[standardN10] AS [standardN10],
[Terminal].[plug] AS [plug],
[Terminal].[socket] AS [socket],
[Terminal].[remark1] AS [remark1],
[Terminal].[remark] AS [remark],
[Terminal].[CCHUp] AS [CCHUp],
[Terminal].[CCWUp] AS [CCWUp],
[Terminal].[ICHUp] AS [ICHUp],
[Terminal].[ICWUp] AS [ICWUp],
[Terminal].[CCHDown] AS [CCHDown],
[Terminal].[CCWDown] AS [CCWDown],
[Terminal].[ICHDown] AS [ICHDown],
[Terminal].[ICWDown] AS [ICWDown],
[Terminal].[CCH] AS [CCH],
[Terminal].[CCW] AS [CCW],
[Terminal].[ICH] AS [ICH],
[Terminal].[ICW] AS [ICW]
FROM [dbo].[Terminal] AS [Terminal]) AS [Extent1]
WHERE ([Extent1].[Terminal] = @p__linq__0) AND ([Extent1].[WireGauge] = @p__linq__1) AND ([Extent1].[WireType] = @p__linq__2) AND ([Extent1].[Die] LIKE N''Q%'') AND ([Extent1].[Seal] IS NULL)',N'@p__linq__0 nvarchar(4000),@p__linq__1 nvarchar(4000),@p__linq__2 nvarchar(4000)',@p__linq__0=N'968221-1',@p__linq__1=N'0.50',@p__linq__2=N'GHB2'
C#代码 需要调用时显式的使用 ctx.Terminal.where(net=>ent.Seal==null) ,才能生成 is null的SQL语句
using (var mfgCtx = com.geelyhd.MFG.EFModel.DBCtx.GetCtx())
{
var q = mfgCtx.Terminal.Where(ent => ent.Terminal1 == ter && ent.WireGauge == card.Guage && ent.WireType == card.Wire_kinds);
if (terArr[i].CCHType == "30高度")
{ q = q.Where(ent=> !ent.Die.StartsWith("Q") ); }
else //40高度带Q
{ q = q.Where(ent => ent.Die.StartsWith("Q")); }
if (seal == null)
{
q = q.Where(ent => ent.Seal == null);
}
else
{
q = q.Where(ent => ent.Seal == seal);
}
it = q.FirstOrDefault(); }
EF对应null的处理的更多相关文章
- GNU PID
多进程编程 写在前面的话 本文主要根据本人在UNIX系统上的编程实践经验总结而成, 既做为自己在 一个时期内编程实践的部分总结, 又可成为文章发表. 对UNIX程序员初学者来 说是一个小小的经验, 仅 ...
- linux之多进程fork:进程通信
++++++++++++++++++信号机制+++++++++++++++++++ 接收信号 int signal(int sig,__sighandler_t handler); int func( ...
- C语言----管道
一.管道的概念 管道是一种队列类型的数据结构,它的数据从一端输入,另一端输出.管道最常见的应用是连接两个进程的输入输出,即把一个进程的输出编程另一个进程的输入.shell中存在专门的管道运算符&quo ...
- EntityFramework Code-First 简易教程（二）-------Code First约定
Code First 约定 在前一篇中,我们已经知道了EF Code-First怎样从模型类(domain classes)中创建数据库表,下面,我们开始学习默认的Code-First约定. 什么是约 ...
- 分享Spring Scheduled定时器的用法
摘要:在coding中经常会用到定时器,指定每隔1个小时,或是每天凌晨2点执行一段代码段,若是使用java.util.Timer来做这种事情,未免重复造轮子.幸亏Spring中封装有定时器,而且非常好 ...
- Entity Framework Code-First（5）：Code First Conventions
Code First Conventions: We have seen how EF Code-First creates DB tables from domain classes in the ...
- Google pieCharts的学习
在公司项目开发过程中, 尤其是在网站的开发过程中,用到很多的前端的插件,在这里, 我简单介绍下近期Google pieCharts的是使用方法 https://developers.google.co ...
- 《深入理解JAVA虚拟机》笔记1
java程序运行时的内存空间,按照虚拟机规范有下面几项: )程序计数器 指示下条命令执行地址.当然是线程私有,不然线程怎么能并行的起来. 不重要,占内存很小,忽略不计. )方法区 这个名字很让我迷惑. ...
- %E3%80%90%E7%BD%91%E7%BB%9C%E7%BC%96%E7%A8%8B%E3%80%91
"%3Cdiv%20class%3D%22htmledit_views%22%20id%3D%22content_views%22%3E%0A%20%20%20%20%20%20%20%20 ...
随机推荐
- JMeter 连接MySQL
第一步:添加JDBC 驱动 第二步:在线程组 下面添加一个“JDBC Connection Configuration” 第三步:在“线程组”,在下面添加一个“JDBC request”
- java类封装成dll
@参考文章1,@参考文章2,@参考文章3 1,建立测试类,注意英文注释部分,用汉语直接编译会乱码 public class Hello { //native method is used for ca ...
- 如何查看Firefox中保存的登录密码
问:以前使用Firefox浏览器登录一个论坛,并且临时申请了一个账号,在使用Firefox登录时选择让它记住密码了,后来,我忘记了那个论坛的密码,但是可以使用Firefox直接登录.现在能不能查看密码 ...
- ios UIScrolloView在storyboard中添加约束
1.在storyboard中如果有UINavigationbar 或 UITabar 布局的时候需要在控制器中勾选掉 Under Top Bars 和 Under Bottom Bars 这两个选项. ...
- samrty模板变量操作符
count_sentences [计算句数],示例:{$smarty.get.name|count_sentences} count_words [计算词数],示例:{$smarty.get.name ...
- 【gRPC使用问题3】生成出来无法识别Google.Api.AnnotationsReflection.Descriptor
1.问题截图: 2.解决方案: Install the package "Google.Api.Gax.Grpc". From the Package Manager Consol ...
- xml转化为Dictionary
代码 public SortedDictionary<string, object> FromXml(string xml) { SortedDictionary<string, o ...
- 关于EOF:
请先看下面一段程序: #include"stdio.h" int main() { ],t; int i,j; while(scanf("%s",a)!=EOF ...
- 9.14 h5日记
9.14 ❤知识补充 margin的问题:margin:0 auto:可以解决元素在网页的居中问题(记得设置宽度) 1.css层叠样式表的问题 CSS的两个性质 (1)继承性 (2)层叠性 ...
- mybatis进阶--mapper输入映射和输出映射
我们知道,mapper.xml是我们配置操作数据库的sql语句的地方.其中每个sql语句对应着一个方法,每个方法都有自己的输入输出参数类型.那么这些类型都是怎么配置的呢?今天我们来一起学习下. 输入映 ...