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The cm dModify but t on Click event procedure doesn t updat e t he MyRowI D Session variable or t he values on t he Web page. At t he end of t he m odify updat e, t he corr ect row alr eady appears on t he Web page. Therefor e, t her e is no need t o show anot her record.
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The cm dDelet e_Click ev ent pr ocedur e borr ows from t he logic of t he t wo preceding ev ent procedures and adds a new w rinkle or t w o. First t he procedure defines a dat a view t o find an index value for t he row display ed on t he Web page, w hich is t he r ow a user want s t o delet e. The second st ep is new . I n t his st ep, t he procedur e inv ok es t he Delet e m et hod for t he r ow in t he dat a t able t hat m at ches t he r ow displayed on t he Web page. This m et hod doesn t physically rem ov e t he row from t he local dat a t able. I nst ead, it m ark s t he r ow for delet ion. When t he procedur e inv ok es t he Updat e m et hod in t he t hird st ep, it finds all r ows m ark ed for delet ion and rem ov es t hem fr om t he SQL Serv er version of t he ASPNETShippers t able. I n t his applicat ion, t her e w ill always be j ust one such r ow. Aft er rem ov ing t he row on t he serv er , t he Updat e m et hod aut om at ically r em ov es t he r ow locally. This t im e t he pr ocedure physically r em oves t he r ow fr om t he local dat a t able. Aft er com plet ing t he delet ion, t he pr ocedur e displays on t he Web page
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t he prev ious row before t he one j ust delet ed. I f t hat row ( t he one j ust delet ed) was t he first row, t he pr ocedur e shows t he old second r ow, w hich is t he new first row . Dim cnn1 As New SqlClient.SqlConnection()Dim cmd1 As New SqlClient.Sq lCommand() Dim dap1 As New SqlClient.SqlDataAdapter() Dim das1 As New DataSet() Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load Make connection to northwind database and point data adapter (dap1) at it cnn1.ConnectionString = Data Source=(local); & _ Initial Catalog=northwind; & _ Integrated Security=SSPI" dap1 = _ New SqlClient.SqlDataAdapter( _ SELECT * FROM ASPNETShippers", cnn1) Set the UpdateCommand property for dap1. dap1.UpdateCommand = _ New SqlClient.SqlCommand _ ( UPDATE ASPNETShippers & _ SET CompanyName = @CompanyName, & _ Phone = @Phone & _ WHERE ShipperID = @ShipperID", _ cnn1) Add two parameters that take source columns from the ASPNETShippers table in the dataset for the dap1 adapter and feed the parameters in the SQL string for the UpdateCommand property. dap1.UpdateCommand.Parameters.Add _ ( @CompanyName", SqlDbType.NVarChar, 40, _ CompanyName ) dap1.UpdateCommand.Parameters.Add _ ( @Phone", SqlDbType.NVarChar, 24, _ Phone ) Specify matching criterion values based on the original version of the ShipperID column in the local ASPNETShippers table. Dim prm1 As SqlClient.SqlParameter = _ dap1.UpdateCommand.Parameters.Add _ ( @ShipperID", SqlDbType.Int) prm1.SourceColumn = ShipperID" prm1.SourceVersion = DataRowVersion.Original Point InsertCommand at a SQL Server stored procedure; you must have the stored procedure on the server. dap1.InsertCommand = New _ SqlClient.SqlCommand( udpInsertANewASPNETShipper", cnn1) dap1.InsertCommand.CommandType = CommandType.StoredProcedure Specify input parameters for the stored procedure. dap1.InsertCommand.Parameters.Add _ ( @CompanyName", SqlDbType.NVarChar, 40, _ CompanyName ) dap1.InsertCommand.Parameters.Add _ ( @Phone", SqlDbType.NVarChar, 24, _
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Phone ) Designate an output parameter for the identity value assigned within SQL Server so that your local ASPNETShippers table can have a matching ShipperID column value. Dim prm2 As SqlClient.SqlParameter = _ dap1.InsertCommand.Parameters.Add _ ( @Identity", SqlDbType.Int, 0, ShipperID ) prm2.Direction = ParameterDirection.Output Specify the SQL string for the DeleteCommand property of dap1. dap1.DeleteCommand = _ New SqlClient.SqlCommand( DELETE & _ FROM ASPNETShippers & _ WHERE ShipperID = @ShipperID", cnn1) Specify matching criterion values based on the original version of the ShipperID column in the local ASPNETShippers table. Dim prm3 As SqlClient.SqlParameter = _ dap1.DeleteCommand.Parameters.Add _ ( @ShipperID", SqlDbType.Int) prm3.SourceColumn = ShipperID" prm3.SourceVersion = DataRowVersion.Original Fill dataset. das1 = New DataSet() dap1.Fill(das1, ASPNETShippers ) On initial page load move to first row and populate text boxes; this code segment must appear after you create the local ASPNETShippers table. If Not Me.IsPostBack Then Session( MyRowID ) = 0 MoveToRow() End If End Sub Private Sub cmdModify_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles cmdModify.Click Use dav1 to find the row in ASPNETShippers that appears in the text boxes from the local ASPNETShippers table. Dim dav1 As DataView = _ New DataView(das1.Tables( ASPNETShippers )) dav1.Sort = ShipperID" Dim rowindex As Integer = _ dav1.Find(TextBox1.Text) Create a DataRow object pointing at the row to update in the local table. Dim IndexedRow As DataRow = _ das1.Tables( ASPNETShippers ).Rows(rowindex) Update the local table with the text boxes.
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IndexedRow( CompanyName ) = TextBox2.Text IndexedRow( Phone ) = TextBox3.Text Invoke Update method for dap1 to synchronize the local table with the one in northwind. dap1.Update(das1, ASPNETShippers ) End Sub Private Sub cmdClear_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles cmdClear.Click Clear text boxes for data entry. TextBox1.Text = " TextBox2.Text = " TextBox3.Text = " End Sub Private Sub cmdInsert_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles cmdInsert.Click Add text box values to new row in dataset Shippers table. Dim newRow As DataRow = das1.Tables( ASPNETShippers ).NewRow() newRow( CompanyName ) = TextBox2.Text newRow( Phone ) = TextBox3.Text das1.Tables( ASPNETShippers ).Rows.Add(newRow) Update method synchronizes inserted local row with its copy in northwind and returns the identity column value added by the northwind database. dap1.Update(das1, ASPNETShippers ) Move to last row and populate text boxes. Session( MyRowID ) = das1.Tables( ASPNETShippers ).Rows.Count - 1 MoveToRow() End Sub Private Sub cmdDelete_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles cmdDelete.Click Create a dataview based on the ASPNETShippers table in the dataset and find the row index that matches the current ShipperID. Dim dav1 As DataView = _ New DataView(das1.Tables( ASPNETShippers )) dav1.Sort = ShipperID" Dim rowIndex As Integer = _ dav1.Find(TextBox1.Text) Mark the row for deletion in the dataset. das1.Tables( ASPNETShippers ).Rows(rowIndex).Delete() Invoke the Update method to complete the deletion in both the SQL Server and dataset Shippers tables. dap1.Update(das1, ASPNETShippers )
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Move to previous row and populate textboxes. If Session( MyRowID ) > 0 Then Session( MyRowID ) -= 1 End If MoveToRow() End Sub
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