sql server variable names already declared in vb.net

I have made this for loop that works ok and grabs the data i need.

within the loop it wont update the table as it says variables already declared, it says this whatever I rename them too:

not sure what to do about that error.

 For Each drAccessRecord As DataRow In dtRecordsFromAccessSmmt.Rows ' each smmt veh cat record

                    '********************************************************************************************************

                    cmdInsertSmmt.CommandText = "UPDATE dbo.TblWords SET VehCategory = @VehCategory WHERE ClientCode = @ClientCode "

                    cmdInsertSmmt.Parameters.AddWithValue("@ClientCode", drAccessRecord("MVRIS CODE"))
                    cmdInsertSmmt.Parameters.AddWithValue("@VehCategory", drAccessRecord("Vehicle Category Code"))
                    cmdInsertSmmt.ExecuteNonQuery()



                Next

Open in new window

PeterBaileyUkAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
Try this syntax instead:

 cmdInsertSmmt.CommandText = "UPDATE dbo.TblWords SET VehCategory = @VehCategory WHERE ClientCode = @ClientCode "

cmdInsertSmmt.Parameters.Add("@ClientCode", SqlDBType.VarChar, 50).Value =  drAccessRecord("MVRIS CODE")
cmdInsertSmmt.Parameters.Add("@VehCategory",SqlDBType.VarChar, 50).value = drAccessRecord("Vehicle Category Code")

Obviously you'd change the "SqlDBType.VarChar" to reflect the actual datatypes.
0
Valliappan ANSenior Tech ConsultantCommented:
Do you do :

cmdInsertSmmt = New SqlCommand()

within the loop, so that parameters are new in every loop?
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
PeterBaileyUkAuthor Commented:
@ Valliappan

I dont believe i have here is the part above the for loop, so does that need to go within the loop?

 Using cnSqlSmmt As New SqlClient.SqlConnection("Data Source=MAIN-PC\SQLEXPRESS;Initial Catalog=Dictionary;Integrated Security=True;MultipleActiveResultSets=True")

            Using cmdInsertSmmt As New SqlClient.SqlCommand
                cmdInsertSmmt.Connection = cnSqlSmmt
                cnSqlSmmt.Open()
                Dim y As Long

                y = dtRecordsFromAccessSmmt.Rows.Count
                For Each drAccessRecord As DataRow In dtRecordsFromAccessSmmt.Rows ' each smmt veh cat record

Open in new window

0
Ultimate Tool Kit for Technology Solution Provider

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy now.

PeterBaileyUkAuthor Commented:
its still giving the error despite those amendments

    Public Sub UpdateVehicleCat()
        Dim dtRecordsFromAccessSmmt As DataTable

        Using cnAccess As New OleDb.OleDbConnection("Provider = Microsoft.Jet.OLEDB.4.0; Data Source=N:\Data\SMMT\smmt master.mdb")
            Using cmdSelect As New OleDb.OleDbCommand
                cmdSelect.Connection = cnAccess
                cnAccess.Open()
                cmdSelect.CommandText = "SELECT [MVRIS CODE], [Vehicle Category Code] FROM smmt;"
                Dim dtAdpt As New OleDb.OleDbDataAdapter(cmdSelect)
                dtRecordsFromAccessSmmt = New DataTable
                dtAdpt.Fill(dtRecordsFromAccessSmmt)
            End Using
        End Using


        Using cnSqlSmmt As New SqlClient.SqlConnection("Data Source=MAIN-PC\SQLEXPRESS;Initial Catalog=Dictionary;Integrated Security=True;MultipleActiveResultSets=True")

            Using cmdInsertSmmt As New SqlClient.SqlCommand
                cmdInsertSmmt.Connection = cnSqlSmmt
                cnSqlSmmt.Open()
                Dim y As Long

                y = dtRecordsFromAccessSmmt.Rows.Count
                For Each drAccessRecord As DataRow In dtRecordsFromAccessSmmt.Rows ' each smmt veh cat record

                    cmdInsertSmmt.CommandText = "UPDATE dbo.TblWords SET VehCategory = @VehCategory WHERE ClientCode = @ClientCode "
                    cmdInsertSmmt.Parameters.Add("@ClientCode", SqlDbType.NVarChar, 50).Value = drAccessRecord("MVRIS CODE")
                    cmdInsertSmmt.Parameters.Add("@VehCategory", SqlDbType.NVarChar, 50).Value = drAccessRecord("Vehicle Category Code")
                    cmdInsertSmmt.ExecuteNonQuery()
                Next

            End Using
            cnSqlSmmt.Close()
        End Using

    End Sub

Open in new window

0
PeterBaileyUkAuthor Commented:
I stepped through and the error was on the 2nd record, so maybe thats because of what  Valliappan said
0
PeterBaileyUkAuthor Commented:
I believe its now working
        Using cnSqlSmmt As New SqlClient.SqlConnection("Data Source=MAIN-PC\SQLEXPRESS;Initial Catalog=Dictionary;Integrated Security=True;MultipleActiveResultSets=True")



            Dim y As Long

                y = dtRecordsFromAccessSmmt.Rows.Count
                For Each drAccessRecord As DataRow In dtRecordsFromAccessSmmt.Rows ' each smmt veh cat record
                Using cmdInsertSmmt As New SqlClient.SqlCommand
                    cmdInsertSmmt.Connection = cnSqlSmmt
                    cnSqlSmmt.Open()
                    cmdInsertSmmt.CommandText = "UPDATE dbo.TblWords SET VehCategory = @VehCategory WHERE ClientCode = @ClientCode "

                    cmdInsertSmmt.Parameters.Add("@ClientCode", SqlDbType.NVarChar, 50).Value = drAccessRecord("MVRIS CODE")
                    cmdInsertSmmt.Parameters.Add("@VehCategory", SqlDbType.NVarChar, 50).Value = drAccessRecord("Vehicle Category Code")
                    cmdInsertSmmt.ExecuteNonQuery()
                    cnSqlSmmt.Close()
                End Using
            Next

        End Using



    End Sub

Open in new window

0
PeterBaileyUkAuthor Commented:
I checked and in some cases it populates in others it doesnt, the for loop has the right count.
0
PeterBaileyUkAuthor Commented:
I debugged with a smaller set of access records just using one record that failed to update previously, that record updated.

it must be the sequence in the for loop with the command objects.

I just do not know what.
0
Valliappan ANSenior Tech ConsultantCommented:
Is the issue resolved ?
0
PeterBaileyUkAuthor Commented:
i am just running it again but it does not appear to get to the end statement I had it running for 40 minutes.

Public Sub UpdateVehicleCat()
        Dim dtRecordsFromAccessSmmt As DataTable

        Using cnAccess As New OleDb.OleDbConnection("Provider = Microsoft.Jet.OLEDB.4.0; Data Source=N:\Data\SMMT\smmt master.mdb")
            Using cmdSelect As New OleDb.OleDbCommand
                cmdSelect.Connection = cnAccess
                cnAccess.Open()
                cmdSelect.CommandText = "SELECT [MVRIS CODE], [Vehicle Category Code] FROM smmt where [Vehicle Category Code] is not null ORDER BY [MVRIS CODE];"
                Dim dtAdpt As New OleDb.OleDbDataAdapter(cmdSelect)
                dtRecordsFromAccessSmmt = New DataTable
                dtAdpt.Fill(dtRecordsFromAccessSmmt)
            End Using
        End Using


        Using cnSqlSmmt As New SqlClient.SqlConnection("Data Source=MAIN-PC\SQLEXPRESS;Initial Catalog=Dictionary;Integrated Security=True;MultipleActiveResultSets=True")



            Dim y As Long



            y = dtRecordsFromAccessSmmt.Rows.Count

                For Each drAccessRecord As DataRow In dtRecordsFromAccessSmmt.Rows ' each smmt veh cat record
                Using cmdInsertSmmt As New SqlClient.SqlCommand
                    cmdInsertSmmt.Connection = cnSqlSmmt
                    cnSqlSmmt.Open()
                    cmdInsertSmmt.CommandText = "UPDATE dbo.TblWords SET VehCategory = @VehCategory WHERE ClientCode = @ClientCode "
                    cmdInsertSmmt.Parameters.Add("@ClientCode", SqlDbType.NVarChar, 50).Value = drAccessRecord("MVRIS CODE")
                    cmdInsertSmmt.Parameters.Add("@VehCategory", SqlDbType.NVarChar, 50).Value = drAccessRecord("Vehicle Category Code")
                    cmdInsertSmmt.ExecuteNonQuery()


                    cnSqlSmmt.Close()




                End Using
            Next



        End Using
        MessageBox.Show("Finished Update Vehicle Category.")
    End Sub

Open in new window

0
Valliappan ANSenior Tech ConsultantCommented:
How many records are you trying to update, and how many is updated so far?
0
PeterBaileyUkAuthor Commented:
There are just under 700000 rows so i think i will have to do this a different way as its poiible its working but its just slow.
0
Valliappan ANSenior Tech ConsultantCommented:
If its one time, you may import the Access table to SQL using SQL Import/Export tool, to a table and then use joins to update it in one sql statement, will be very fast.

Another option is to use, OpenDataSource, or OpenQuery, or Linked Servers. But i would suggest above option.

Thanks.
0
PeterBaileyUkAuthor Commented:
I will append the data to a smaller table, I think its almost there its the syntax thats causing an exception

  cmdInsertSmmt.CommandText = "INSERT INTO TblVehCat (ClientCode, VehCategory) VALUES ('" & drAccessRecord("MVRIS CODE") & "', '" & drAccessRecord("Vehicle Category Code") & "','" & " )"


                    cmdInsertSmmt.ExecuteNonQuery()

Open in new window

0
PeterBaileyUkAuthor Commented:
finally got it with
 cmdInsertSmmt.CommandText = "INSERT INTO TblVehCat (ClientCode, VehCategory) VALUES ('" & drAccessRecord("MVRIS CODE") & "', '" & drAccessRecord("Vehicle Category Code") & "'" & " )"

Open in new window

0
PeterBaileyUkAuthor Commented:
thank you that was the exact cause.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft SQL Server

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.