Prevent inserting duplicate values in SQL Server database

Hi Experts,
I'm using the following code to insert values in my table:
INSERT INTO OT_Table (OT_Line, Emp_Id, Timestamp) VALUES ('"& strOT_Line &"','"& strEmp_Id &"','"& strTimeStamp &"')

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I would like to prevent insertion if the OT_Line and Emp_Id are the same.
In that case I would just like to update the value of the TimeStamp field.

How can I accomplish that on my classic ASP page?
Thank you for your help
romsomIT DeveloperAsked:
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Daniel Van Der WerkenIndependent ConsultantCommented:
This is what I do for my INSERT script:

IF NOT EXISTS(SELECT * FROM OT_Table WHERE OT_Line = @strOT_Line  AND TimeStamp  = @strTimeStamp )
   BEGIN
     INSERT INTO OT_Table(OT_Line, Emp_Id, TimeStamp) VALUES (@strOT_Line, @Emp_Id, @strTimeStamp)
   END
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Kyle AbrahamsSenior .Net DeveloperCommented:
I normally call a stored procedure:

create procedure updOTTable
@Ot_Line int,
@emp_id int,
@time datetime
as

if (select count(*) from ot_table where ot_line = @ot_line and emp_id  = @emp_id )  = 0
   -- insert statement
INSERT INTO OT_Table (OT_Line, Emp_Id, Timestamp) VALUES (@ot_line, @emp_id, @timestamp)
else
   -- update statement
    update ot_table
set timestamp = @time where ot_line = @ot_line and emp_id  = @emp_id



You would then call the stored proc in your code.
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romsomIT DeveloperAuthor Commented:
Thank you very much; it's working now. This is classic ASP so I've used the following code:

IF NOT EXISTS(SELECT * FROM OTEWR WHERE OT_Line = '"& strOT_Line &"' AND Emp_Id  = '"& strEmp_Id &"' ) BEGIN INSERT INTO OTEWR(OT_Line, Emp_Id, PersonAddedOn) VALUES ('"& strOT_Line &"', '"& strEmp_Id &"', '"& strPersonAddedOn &"') END
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