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comparing a datetime in WHERE clause inMFC CRecordset

Posted on 2000-03-30
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Last Modified: 2010-08-05
I'm using MFC CRecordset class to select records from an ODBC Data Source (Access).  I'm trying to set a filter for a datetime column (named "Date") compared to a value I'm building from data in my program.

for values of m_strFilter, I've tried tried:
"Date > '03/30/00 10:00:00'"
"Date > '10:00:00 03/30/00'"

... and just about every variation on the date format.  No records are selected (triple checked that they should have been).  I also tried leaving out the time, and comparing against the date only.

I saw some articles referencing the CONVERT function, so I tried that ("Date > CONVERT(datetime,'03/30/00')") However, that gives a CDatabaseException with reason: "CONVERT is an unknown function"
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Question by:sniles
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 2672051
Try this:
"[Date] > #2000/03/30 10:00:00#"
or
"[Date] > #2000/03/30#"
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Author Comment

by:sniles
ID: 2673392
I tried those, but they did not work.  With no single quotes around the date field (as in your suggestion), nothing was selected.  When no single quotes were used a record from 3/28/00 and the record from 3/30/00 was selected.
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Expert Comment

by:paasky
ID: 2673587
Hello sniles,

Use CDate() with Access database:

Date > CDate('03/30/00 10:00:00')
Date > CDate('10:00:00 03/30/00')

It converts value to valid date.

Hope this helps,
Paasky
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Author Comment

by:sniles
ID: 2676348
Thanks!  That did work.  Is this is a general solution?  You specifically mentioned Access -- will this also work with SQL Server (& other ODBC)?
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Accepted Solution

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paasky earned 200 total points
ID: 2677217
Happy to help you sniles,

Unfortunately there's no general solution that will work for all ODBC sources. You need to use the specific conversion function of the specific database you're using.

CDate('03/30/00 10:00:00') works with Access.

CONVERT(DateTime, '03/30/00 10:00:00') works with SQL Server

TO_DATE('03/30/00 10:00:00','MM/DD/YY HH24:MI:SS') works with Oracle.

Regards,
Paasky
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Author Comment

by:sniles
ID: 2677337
Thanks again!
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