SqlDataAdapter.RowUpdated Event

public:
 event System::Data::SqlClient::SqlRowUpdatedEventHandler ^ RowUpdated;

[System.Data.DataSysDescription("DbDataAdapter_RowUpdated")]
public event System.Data.SqlClient.SqlRowUpdatedEventHandler RowUpdated;

public event System.Data.SqlClient.SqlRowUpdatedEventHandler RowUpdated;

[<System.Data.DataSysDescription("DbDataAdapter_RowUpdated")>]
member this.RowUpdated : System.Data.SqlClient.SqlRowUpdatedEventHandler 

member this.RowUpdated : System.Data.SqlClient.SqlRowUpdatedEventHandler 

Public Custom Event RowUpdated As SqlRowUpdatedEventHandler 

Händelsetyp

Attribut

DataSysDescriptionAttribute

Exempel

I följande exempel visas hur du använder både RowUpdating händelserna och RowUpdated .

Händelsen RowUpdating returnerar följande utdata:

event args: (command=System.Data.SqlClient.SqlCommand commandType=2 status=0)

Händelsen RowUpdated returnerar följande utdata:

event args: (command=System.Data.SqlClient.SqlCommand commandType=2 recordsAffected=1 row=System.Data.DataRow[37] status=0)

// handler for RowUpdating event
private static void OnRowUpdating(object sender, SqlRowUpdatingEventArgs e)
{
    PrintEventArgs(e);
}

// handler for RowUpdated event
private static void OnRowUpdated(object sender, SqlRowUpdatedEventArgs e)
{
    PrintEventArgs(e);
}

public static int Main()
{
    const string connectionString = "...";
    const string queryString = "SELECT * FROM Products";

    // create DataAdapter
    SqlDataAdapter adapter = new(queryString, connectionString);
    SqlCommandBuilder builder = new(adapter);

    // Create and fill DataSet (select only first 5 rows)
    DataSet dataSet = new();
    adapter.Fill(dataSet, 0, 5, "Table");

    // Modify DataSet
    DataTable table = dataSet.Tables["Table"];
    table.Rows[0][1] = "new product";

    // add handlers
    adapter.RowUpdating += new SqlRowUpdatingEventHandler(OnRowUpdating);
    adapter.RowUpdated += new SqlRowUpdatedEventHandler(OnRowUpdated);

    // update, this operation fires two events
    // (RowUpdating/RowUpdated) per changed row
    adapter.Update(dataSet, "Table");

    // remove handlers
    adapter.RowUpdating -= new SqlRowUpdatingEventHandler(OnRowUpdating);
    adapter.RowUpdated -= new SqlRowUpdatedEventHandler(OnRowUpdated);
    return 0;
}

private static void PrintEventArgs(SqlRowUpdatingEventArgs args)
{
    Console.WriteLine("OnRowUpdating");
    Console.WriteLine("  event args: (" +
        " command=" + args.Command +
        " commandType=" + args.StatementType +
        " status=" + args.Status + ")");
}

private static void PrintEventArgs(SqlRowUpdatedEventArgs args)
{
    Console.WriteLine("OnRowUpdated");
    Console.WriteLine("  event args: (" +
        " command=" + args.Command +
        " commandType=" + args.StatementType +
        " recordsAffected=" + args.RecordsAffected +
        " status=" + args.Status + ")");
}

    ' handler for RowUpdating event
    Private Shared Sub OnRowUpdating(sender As Object, e As SqlRowUpdatingEventArgs)
        PrintEventArgs(e)
    End Sub

    ' handler for RowUpdated event
    Private Shared Sub OnRowUpdated(sender As Object, e As SqlRowUpdatedEventArgs)
        PrintEventArgs(e)
    End Sub

    Public Overloads Shared Function Main(args() As String) As Integer
        Const connectionString As String = "..."
        Const queryString As String = "SELECT * FROM Products"

        ' create DataAdapter
        Dim adapter As New SqlDataAdapter(queryString, connectionString)
        Dim builder As New SqlCommandBuilder(adapter)

        ' Create and fill DataSet (select only first 5 rows)
        Dim dataSet As New DataSet()
        adapter.Fill(dataSet, 0, 5, "Table")

        ' Modify DataSet
        Dim table As DataTable = dataSet.Tables("Table")
        table.Rows(0)(1) = "new product"

        ' add handlers
        AddHandler adapter.RowUpdating, AddressOf OnRowUpdating
        AddHandler adapter.RowUpdated, AddressOf OnRowUpdated

        ' update, this operation fires two events
        '(RowUpdating/RowUpdated) per changed row
        adapter.Update(dataSet, "Table")

        ' remove handlers
        RemoveHandler adapter.RowUpdating, AddressOf OnRowUpdating
        RemoveHandler adapter.RowUpdated, AddressOf OnRowUpdated
        Return 0
    End Function


    Private Overloads Shared Sub PrintEventArgs(args As SqlRowUpdatingEventArgs)
        Console.WriteLine("OnRowUpdating")
        Console.WriteLine("  event args: (" & " command=" & args.Command.CommandText &
           " commandType=" & args.StatementType & " status=" & args.Status & ")")
    End Sub


    Private Overloads Shared Sub PrintEventArgs(args As SqlRowUpdatedEventArgs)
        Console.WriteLine("OnRowUpdated")
        Console.WriteLine("  event args: (" & " command=" & args.Command.CommandText &
           " commandType=" & args.StatementType & " recordsAffected=" &
           args.RecordsAffected & " status=" & args.Status & ")")
    End Sub
End Class

Kommentarer

När du använder Update, finns det två händelser som inträffar per datarad uppdaterad. Körningsordningen är följande:

1. Värdena i DataRow flyttas till parametervärdena.

2. Händelsen OnRowUpdating aktiveras.

3. Kommandot körs.

4. Om kommandot är inställt på FirstReturnedRecordplaceras det första returnerade resultatet i DataRow.

5. Om det finns utdataparametrar placeras de i DataRow.

6. Händelsen OnRowUpdated aktiveras.

7. AcceptChanges kallas.

Se även

• Manipulera data (ADO.NET)
• Använder .NET Framework Data Provider för SQL Server
• översikt över ADO.NET