how to fix vb.net error data type mismatch in criteria expression access date time

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Dim cb As String = "insert into Product(ProductID,ProductName,ProductType,Category,Specification,Date3,UnitPrice) VALUES (@d1,@d2,@d3,@d4,@d5,'""#" & StockDate.Text & "#""',@d7)"


                cmd = New OleDbCommand(cb)

                cmd.Connection = con


                cmd.Parameters.Add(New OleDbParameter("@d1", System.Data.OleDb.OleDbType.VarChar, 20, "ProductID"))
                cmd.Parameters.Add(New OleDbParameter("@d2", System.Data.OleDb.OleDbType.VarChar, 250, "ProductName"))
                cmd.Parameters.Add(New OleDbParameter("@d3", System.Data.OleDb.OleDbType.VarChar, 250, "ProductType"))
                cmd.Parameters.Add(New OleDbParameter("@d4", System.Data.OleDb.OleDbType.VarChar, 150, "Category"))
                cmd.Parameters.Add(New OleDbParameter("@d5", System.Data.OleDb.OleDbType.VarChar, 250, "Specification"))
                cmd.Parameters.Add(New OleDbParameter("@d6", System.Data.OleDb.OleDbType.Date, "StockDate"))
                cmd.Parameters.Add(New OleDbParameter("@d7", System.Data.OleDb.OleDbType.Double, 10, "UnitPrice"))

                


                cmd.Parameters("@d1").Value = ProductID.Text
                cmd.Parameters("@d2").Value = ProductName1.Text
                cmd.Parameters("@d3").Value = ProductType1.Text
                cmd.Parameters("@d4").Value = Category.Text
                cmd.Parameters("@d5").Value = Specification.Text
                md.Parameters("@d6").Value = StockDate.Text
                cmd.Parameters("@d7").Value = CDbl(UnitPrice.Text)

Posted 9-Apr-15 1:45am

Member 11593555

Updated 9-Apr-15 1:53am

CHill60

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CHill60 9-Apr-15 8:01am

You haven't defined the maximum size in cmd.Parameters.Add(New OleDbParameter("@d6", System.Data.OleDb.OleDbType.Date, "StockDate"))

Richard MacCutchan 9-Apr-15 8:03am

You have declared it as a Date type, but then set the value as text.

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OriginalGriff · Answer 1 · 2015-04-09T02:04:00

Probably because you are trying to put a string value: '#your date#' into a date field.

So why - if you know what parametrized queries are, and you clearly do - are you directly creating a problem ***and*** leaving your DB open to SQL Injection attacks but not using a parameterized query for the date column as well?
Parse your user input into a DateTime value, and pass that as a parameter - your problem will go away, and you will be protected...

Richard Deeming · Answer 2 · 2015-04-09T02:05:00

Why have you used string concatenation to pass one parameter? You clearly know how to use a parameterized query, since all of the other parameters are passed correctly, but you've chosen to use string concatenation for the StockDate.Text, leaving your code vulnerable to SQL Injection[^].

Fix the vulnerability, and you will fix your error:

VB.NET

Dim cb As String = "insert into Product(ProductID,ProductName,ProductType,Category,Specification,Date3,UnitPrice) VALUES (@d1,@d2,@d3,@d4,@d5,@d6,@d7)"

how to fix vb.net error data type mismatch in criteria expression access date time

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