ASP.Net/ADO.net Database/Edit Command Column
asp:editcommandcolumn in action (VB.net)
<source lang="csharp">
<%@ Page Language=VB Debug=true %> <%@ Import Namespace="System.Data" %> <%@ Import Namespace="System.Data.OLEDB" %> <script runat=server> Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs)
If Not IsPostBack Then
BuildDataList
End If
End Sub Sub Edit_Grid(sender As Object, e As DataGridCommandEventArgs)
dgEmps.EditItemIndex = e.Item.ItemIndex BuildDataList
End Sub Sub Update_Grid(ByVal Sender as Object, ByVal E as DataGridCommandEventArgs)
Dim TheID as String
Dim LastName as String
Dim FirstName as String
TheID = E.Item.Cells(2).Text
LastName = CType(e.Item.Cells(0).Controls(0), TextBox).Text
FirstName = CType(e.Item.Cells(1).Controls(0), TextBox).Text
Dim DBConn as OleDbConnection
Dim DBUpdate As New OleDbCommand
DBConn = New OleDbConnection( _
"PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
& "DATA SOURCE=" _
& Server.MapPath("EmployeeDatabase.mdb;"))
DBUpdate.rumandText = "Update Employee " _
& "Set LastName = "" & LastName &"", " _
& "FirstName = "" & FirstName & "" " _
& "Where ID = " & TheID
DBUpdate.Connection = DBConn
DBUpdate.Connection.Open
DBUpdate.ExecuteNonQuery()
DBConn.Close
dgEmps.EditItemIndex = -1
BuildDataList
End Sub Sub BuildDataList ()
Dim DBConn as OleDbConnection
Dim DBCommand As OleDbDataAdapter
Dim DSPageData as New DataSet
DBConn = New OleDbConnection( _
"PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
& "DATA SOURCE=" _
& Server.MapPath("EmployeeDatabase.mdb;"))
DBCommand = New OleDbDataAdapter _
("Select * From Employee " _
& "Order By LastName, FirstName", DBConn)
DBCommand.Fill(DSPageData, _
"Employee")
dgEmps.DataSource = _
DSPageData.Tables("Employee").DefaultView
dgEmps.DataBind()
End Sub
</SCRIPT>
<HTML>
<HEAD>
<TITLE>Editing Rows from a DataGrid Control</TITLE>
</HEAD>
<Body LEFTMARGIN="40">
<form runat="server">
<asp:Label
id="lblMessage" runat="server"
/>
<asp:datagrid
id="dgEmps"
runat="server"
autogeneratecolumns="false"
oneditcommand="Edit_Grid"
onupdatecommand="Update_Grid"
>
<columns>
<asp:boundcolumn
HeaderText="Last Name"
DataField="LastName"
/>
<asp:boundcolumn
HeaderText="First Name"
DataField="FirstName"
/>
<asp:boundcolumn
datafield="ID"
visible=False
readonly=true
/>
<asp:editcommandcolumn
edittext="Edit"
updatetext="Update"
itemstyle-wrap="false"
headertext="Edit"
headerStyle-wrap="false"
/>
</columns>
</asp:datagrid> </form> </BODY> </HTML>
</source>
<A href="http://www.nfex.ru/Code/ASPDownload/EmployeeDatabase.zip">EmployeeDatabase.zip( 10 k)</a>
Synchronize database operations (C#)
<source lang="csharp">
<%-- Beginning ASP.NET 1.0 with C# (Paperback) by David Sussman, Chris Ullman,
Juan T. Llibre, John Kauffman, Ollie Cornes, Ajoy Krishnamoorthy, Srinivasa Sivakumar, Chris Goode, Neil Raybould, Christopher Miller, Rob Birdwell, Matt Butler, Gary Johnson
- Publisher: Wrox Press; 1st edition (June 2002)
- Language: English
- ISBN: 1861007345
--%> <%@ Import Namespace="System.Data" %> <%@ Import Namespace="System.Data.OleDb" %> <script language="VB" runat="server">
Sub Page_Load(Sender As Object, E As EventArgs)
Dim strConnection As String
Dim strSQL As String
Dim objDataSet As New DataSet()
Dim objConnection As OleDbConnection
Dim objAdapter As OleDbDataAdapter
strConnection = "Provider=Microsoft.Jet.OLEDB.4.0; " & _
"Data Source="+MapPath("EmployeeDatabase.mdb")
strSQL = "SELECT ID, FirstName, LastName FROM Employee;"
objConnection = New OledbConnection(strConnection)
objAdapter = New OledbDataAdapter(strSQL, objConnection)
objAdapter.Fill(objDataSet, "Employees")
dgNameList1.DataSource = objDataSet.Tables("Employees").DefaultView
dgNameList1.DataBind()
" -----------------------------------------------------------------
Dim objTable As DataTable
Dim objNewRow As DataRow
objTable = objDataSet.Tables("Employees")
objNewRow = objTable.NewRow()
objNewRow("FirstName") = "Norman"
objNewRow("LastName") = "Blake"
objTable.Rows.Add(objNewRow)
" add another new row. We"ll be deleting the one above later.
" we can"t delete existing rows from the database because of
" referential integrity (every employee also has Orders)
objNewRow = objTable.NewRow()
objNewRow("FirstName") = "Kasey"
objNewRow("LastName") = "Chambers"
objTable.Rows.Add(objNewRow)
" bind the data grid to the new data dgNameList2.DataSource = objTable.DefaultView dgNameList2.DataBind()
" -----------------------------------------------------------------
" edit an existing row in the table
Dim objRow As DataRow
" The Rows collection is 0 indexed, so this changes the fourth row
objRow = objTable.Rows(3)
objRow("FirstName") = "John"
objRow("LastName") = "Hartford"
" bind the data grid to the new data
dgNameList3.DataSource = objTable.DefaultView
dgNameList3.DataBind()
" ----------------------------------------------------------------- " delete a row from the table " The Rows collection is 0 indexed, so this removes the sixth row objTable.Rows(objTable.Rows.Count - 2).Delete() " bind the data grid to the new data dgNameList4.DataSource = objTable.DefaultView dgNameList4.DataBind()
" ================================================================= " generate the update commands Dim objBuilder As OleDbCommandBuilder objBuilder = New OleDbCommandBuilder(objAdapter) objAdapter.UpdateCommand = objBuilder.GetUpdateCommand() objAdapter.InsertCommand = objBuilder.GetInsertCommand() objAdapter.DeleteCommand = objBuilder.GetDeleteCommand()
" ================================================================= " update the data store objAdapter.Update(objDataSet, "Employees") " ================================================================= " refresh the data in the DataReader and bind it to a new grid " to prove that the data store has been updated strSQL = "SELECT ID, FirstName, LastName FROM Employee" objConnection.Open() Dim objCmd As New OleDbCommand(strSQL, objConnection) dgUpd.DataSource = objCmd.ExecuteReader(CommandBehavior.CloseConnection) dgUpd.DataBind() End Sub
</script> <html>
<body>
| Original Data | Data with new Row | Data with edited Row | Data with deleted Row |
| <asp:DataGrid id="dgNameList1" runat="server" /> | <asp:DataGrid id="dgNameList2" runat="server" /> | <asp:DataGrid id="dgNameList3" runat="server" /> | <asp:DataGrid id="dgNameList4" runat="server" /> |
Data fetched from database after the update:
<asp:DataGrid id="dgUpd" runat="server"/> </body>
</html>
</source>
<A href="http://www.nfex.ru/Code/ASPDownload/EmployeeDatabase.zip">EmployeeDatabase.zip( 10 k)</a>
