How To Know The Record I Want To Query Doesn't Exist Via LINQ?

Aug 13, 2007

Hi all:

for example:
testDataContext db=new testDataContext();
var res=db.tables.single(p=>p.columnName=="hi");

if there is a record in the database, it works well, but if there isn't , it will throw an exception, then , How could I know the record exists or not ?  I don't think exception is a resonable way. and in my opinion, there should be--------even must be ------a resonable way , to evaluate the query result to a bool variable, then program could judge the bool variable like :

if(bExist)
  show("yes, I find it");
else
  show("sorry, the record doesn't exist in the database");

I can't imagine I got the bool variable via exception...

thanks to all.. 

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==========================



Declare @cmdstring varchar(255)
Declare @filename varchar(32)
DECLARE @v datetime

SELECT @v = GetDate()
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DETAILTRANS.BOOKINGUNIT,
DETAILTRANS.BOOKINGQUANTITY,
DETAILTRANS.STATEMENTSEQ,
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'' RECEND
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===========
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------------------------------
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9
10
11 namespace Ex
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13 {
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15 class Program
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17 {
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41 }
42
43 }
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Dear friends,

I am thinkking there has to be away to do this in a SQL
statement.

can't you do some kind of...

Create Procedure sp_update_users
@User_Id Int,
@Title_Id Int

AS
UPDATE USERS
DELETE WHERE @User_ID = User_Id and @Title_Id = @Title_Id
ELSE
INSERT INTO USERS VALUES (@User_ID,@Title_Id;)

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Aug 4, 2015

I'm trying to translate this portion of VFP code into LINQ query:

select COUNT(ID) as conflicts
from dbo.max4sale where <<thisform.cWhere>>
AND Start_Time >= <<VFP2SQL(m.ltBegin + m.lnStartTime)>>
and Start_time <= <<VFP2SQL(m.ltEnd)>>
AND CONVERT(varchar(5),Start_Time,108) <= <<VFP2SQL(m.lcEndTime)>>
AND CONVERT(varchar(5),End_Time,108) >= <<VFP2SQL(m.lcStartTime)>>
<<m.lcDays>>

Here is my non-working attempt:

var startTime = new DateTime(1900, 1, 1, beginDateTime.Hour, beginDateTime.Minute, 0);
var endTime = new DateTime(1900, 1, 1, endDateTime.Hour, endDateTime.Minute, 0);
var daysOfWeek = dailyLimits.Where(dl => dl.Selected == true).Select(ds => ds.WeekDay).ToList();
if (daysOfWeek.Count() < 7) // not all days of the week selected

[Code] .......

First of all, I see a bug in my logic now as the first part of the query I need to do all the time and only the second part if the count < 7. But that's not my problem - I can not figure out how to make times comparison only using LINQ. Ideally I think I'd like to have cast(start_time as time) >= @p1 as a result to be executed by LINQ.

BTW, I am only getting the error in run-time that Parse can not be interpreted. So, I need to figure out another way of making LINQ recognize my intent of checking time portion of the date only.

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Aug 15, 2004

Hello, every one:

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ZYT

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