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parameterized query with SQL

Posted on 2006-03-30
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Last Modified: 2010-04-23
What I want is to retrieve only record at a time.  To retrieve a data., enter a nameID and click on the button1. Then if a row is found with that nameID, the row is retreived and diplay data on the form(txtCity, txtState and txtZip)
.................


An unhandled exception of type 'System.IndexOutOfRangeException' occurred in system.data.dll

Additional information: An SqlParameter with ParameterName '@nameID' is not contained by this SqlParameterCollection.

................

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim iRecords As Integer

        If Me.TextBox1.Text <> "" Then

            SqlDataAdapter1.SelectCommand.Parameters("@nameID").Value _
            = Me.TextBox1.Text

            DataSet11.Clear()
            iRecords = SqlDataAdapter1.Fill(DataSet11)

            If  iRecords = 0 Then
                Me.SetEntryControls(False)
                MessageBox.Show("Error", "Entry Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
            Else
                Me.SetEntryControls(True)
                Me.TextBox1.Focus()



            End If


        End If
    End Sub

    Private Sub SetEntryControls(ByVal bEditmode As Boolean)

        Me.txtCity.Enabled = bEditmode
        Me.txtState.Enabled = bEditmode
        Me.txtZip.Enabled = bEditmode
       
    End Sub
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Question by:VBdotnet2005
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2 Comments
 
LVL 11

Expert Comment

by:LordWabbit
ID: 16340574
You need to add the @nameID parameter, you are trying to reference it in your parameters collection before it's been added.  
SqlDataAdapter1.SelectCommand.Parameters.Add("@nameID", Me.TextBox1.Text)

After that you can change it with

SqlDataAdapter1.SelectCommand.Parameters("@nameID").Value _
            = Me.TextBox1.Text

if need be and continue using the same data adapter.  Just remember that if you try to add @nameID again it will fail because it's already in the collection, so either modify it or alternatively you can clear the parameters collection and add again.
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LVL 11

Accepted Solution

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LordWabbit earned 1000 total points
ID: 16340586
oh yeah forgot to say that if you want only one record in the table you can add TOP 1 to your select statement.
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