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CreateParameter with varbinary

Posted on 2008-10-12
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Last Modified: 2008-10-12
I am trying to create queries to store a MD5 encoded password in SQL server field with datatype varbinary(50)

I get the error "Application uses a value of the wrong type for the current operation. "

Below is the code.  What's going wrong??

<%

Set cmdSetPassword = Server.CreateObject ("ADODB.Command")
cmdSetPassword.ActiveConnection = MM_sqldb_STRING
cmdSetPassword.CommandText = "UPDATE Users  SET Password = ? WHERE Username = ?"
cmdSetPassword.Parameters.Append cmdSetPassword.CreateParameter("varPassword", 204, 1, 50, MM_IIF(varPassword, varPassword, cmdSetPassword__varPassword & ""))
cmdSetPassword.Parameters.Append cmdSetPassword.CreateParameter("varUsername", 200, 1, 50, MM_IIF(varUsername, varUsername, cmdSetPassword__varUsername & ""))
cmdSetPassword.CommandType = 1
cmdSetPassword.CommandTimeout = 0
cmdSetPassword.Prepared = true
cmdSetPassword.Execute()

%>
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Question by:probelaw
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5 Comments
 
LVL 75

Expert Comment

by:Anthony Perkins
ID: 22697897
>>store a MD5 encoded password in SQL server field with datatype varbinary(50)<<
Any reason to use varbinary?  Why not use varchar?

What is the data type for the value you are assigning to the password?

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Author Comment

by:probelaw
ID: 22698105
At the moment I believe it is just a binary value resulting from the MD5 function

i.e....

varPassword = MD5(Password)

Should it be declared a specific way?
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LVL 75

Accepted Solution

by:
Anthony Perkins earned 500 total points
ID: 22698937
>>At the moment I believe it is just a binary value resulting from the MD5 function<<
Since there is no data type called "binary" in VB I would suggest you set it to variant when you pass it to a parameter in a stored procedure defined as varbinary.  However I would suggest you instead define it as string and change the stored procedure and table to use a varchar data type.
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Author Comment

by:probelaw
ID: 22698992
Changing the datatype in the database to varchar and the parameter to the same works well.  Is there any big difference or risk to doing it this way?

Thanks for the help.
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LVL 75

Expert Comment

by:Anthony Perkins
ID: 22699028
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