Category: LINQ

21 Jan 2016 23:24

Joined:	21/01/2016
Level:	Bronze
Points:	0

Points:	3

Compare a date which is stored as char(8) using LinQ

Hi,

In db, a date column is designed as Char(8).
I want to compare if this date falls between 2 given dates.
Eg:
Where(tmp => tmp.DateField1.CompareTo(st_dt) >= 0 && tmp.create_dt.CompareTo(ed_dt1) <= 0)

I tried this. But not getting expected results.
Can anyone please correct me?

Thanks.

#764204

22 Jan 2016 01:34

Joined:	28/04/2006
Level:	Gold
Points:	30349

Points:	2

Hai Shari,
To compare the date, first your char(8) value should e converted to the date format and once it is converted, you can compare it.
Select Cast(@s) as Date will give you the date format.
Now you can use your old code which should work.
Hope it will be helpful to you.

Regards,
Pawan Awasthi(DNS MVM)
+91 8123489140 (whatsApp), +60 14365 1476(Malaysia)
pawansoftit@gmail.com

#764206

22 Jan 2016 01:41

Joined:	21/01/2016
Level:	Bronze
Points:	0

Points:	1

Hi Pawan,

Thanks for the reply.
This is the LinQ which am using to fetch a set of columns

(from r in table1
orderby r.DateField1 descending
select r).Where(tmp => tmp.DateField1.CompareTo(st_dt) >= 0 && tmp.DateField1.CompareTo(ed_dt1) <= 0)

Here how to cast the DateField1 to Date?

Thanks

#764232

22 Jan 2016 23:24

Joined:	13/06/2007
Level:	Gold
Points:	21327

Points:	3

With help of SQL you can use CAST method to cast input value to date and then compare see below snippet
SELECT * FROM dbo.tbl_MyTable
WHERE
CAST(CONVERT(CHAR(10), DateTimeValueColumn, 102) AS DATE) = CAST(CONVERT(CHAR(10),GETDATE(),102) AS DATE)
But in LINQ case you can use DateTime.Compare method
DateTime.Compare(x.price_date.Value.Date, dt.Date) == 0).ToList();

Thanks
Koolprasd2003
Editor, DotNetSpider MVM
Microsoft MVP 2014 [ASP.NET/IIS]

#764234

23 Jan 2016 04:37

Joined:	23/01/2016
Level:	Bronze
Points:	0

Points:	4

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Compare a date which is stored as char(8) using LinQ

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