Select by date and time, parameters mismatch Error

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Hi Everybody,
I have a table with the fields Logid(primery key), Name, Address,EnteranceTime,LeaveTime
I want to access the records where the 'leavetime is null' and 'difference of Enterance time and the current time is less than the time duration I specify'. I am trying to pass current time and the time duration as function parameters. Problem is I can't pass the parameters right way. The error is parameters mismatch.
SELECT Logid, Name, Address, Company, EnteranceTime, LeaveTime, CardId
FROM EnteranceLog
WHERE (LeaveTime IS NULL) AND (EnteranceTime - ? = ?)
In c# I am calling the query this way

TimeSpan timespan = getduration();
this.enteranceLogMissingPersonsTableAdapter.Fill(this.enteranceLogDataSet.EnteranceLogMissingPersons, DateTime.Now.ToString (), timespan.ToString () );
please guide me how can I overcome this error

Posted 28-Jan-10 4:57am

J imran

Updated 28-Jan-10 5:01am

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amitthakkar1987 · Answer 1 · 2010-01-28T05:54:00

when u pass to parameter you must convert the parameter value...
like if u create a table and define column like
cur_time timestamp datatype then ...
first you create the object

SqlCommand cmd = new SqlCommand();
cmd.parameter.add("date",sqldbtype.timestamp);

i hope might you got some selp

*dan!sh* · Answer 2 · 2010-01-28T05:56:00

Solution 2

You should use the DateDiff function in your SQL. In the code, just pass the duration. You can get the current date and time through GetDate in SQL.

Posted 28-Jan-10 5:56am

dan!sh