ASP.Net/ADO.net Database/Synchronize — различия между версиями

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м (1 версия)
 
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Версия 15:30, 26 мая 2010

Synchronize Database operation

<%@ 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=C:\Northwind.mdb"
     strConnection = "Provider=sqloledb;Data Source=whsql-v08.prod.mesa1.secureserver.net;Initial Catalog=DB_49907;User ID=nfexuser;Password=password;"
  
    strSQL = "SELECT EmployeeID, FirstName, LastName FROM Employees;"
    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)
    
    objNewRow = objTable.NewRow()
    objNewRow("FirstName") = "Kasey"
    objNewRow("LastName") = "Chambers"
    objTable.Rows.Add(objNewRow)

    dgNameList2.DataSource = objTable.DefaultView
    dgNameList2.DataBind()

    Dim objRow As DataRow
    
    objRow = objTable.Rows(3)
    objRow("FirstName") = "John"
    objRow("LastName") = "Hartford"
    " bind the data grid to the new data
    dgNameList3.DataSource = objTable.DefaultView
    dgNameList3.DataBind()

    objTable.Rows(objTable.Rows.Count - 2).Delete()
    
    dgNameList4.DataSource = objTable.DefaultView
    dgNameList4.DataBind()

    Dim objBuilder    As OleDbCommandBuilder
    objBuilder = New OleDbCommandBuilder(objAdapter)
    objAdapter.UpdateCommand = objBuilder.GetUpdateCommand()
    objAdapter.InsertCommand = objBuilder.GetInsertCommand()
    objAdapter.DeleteCommand = objBuilder.GetDeleteCommand()
    objAdapter.Update(objDataSet, "Employees")
    
    strSQL = "SELECT EmployeeID, FirstName, LastName FROM Employees"
    objConnection.Open()
    Dim objCmd As New OleDbCommand(strSQL, objConnection)
    dgUpd.DataSource = objCmd.ExecuteReader(CommandBehavior.CloseConnection)
    dgUpd.DataBind()
  
  End Sub
</script>
<html>
 <body>
  <table width="100%">
   <tr>
    <td>Original Data</td>
    <td>Data with new Row</td>
    <td>Data with edited Row</td>
    <td>Data with deleted Row</td>
   </tr>
   <tr>
    <td valign="top"><asp:DataGrid id="dgNameList1" runat="server" /></td>
    <td valign="top"><asp:DataGrid id="dgNameList2" runat="server" /></td>
    <td valign="top"><asp:DataGrid id="dgNameList3" runat="server" /></td>
    <td valign="top"><asp:DataGrid id="dgNameList4" runat="server" /></td>
   </tr>
  </table>
  
  <hr />
  
  Data fetched from database after the update:<br/>
  
  <asp:DataGrid id="dgUpd" runat="server"/>
  
 </body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.Net/ADO.net_Database/Synchronize&oldid=1622»