SqlDataAdapter.RowUpdating Evento

Definición

Se produce durante el método Update(DataSet), antes de que se ejecute un comando en el origen de datos.Occurs during Update(DataSet) before a command is executed against the data source. Se ha realizado un intento de actualización, de manera que se inicia el evento.The attempt to update is made, so the event fires.

public:
 event System::Data::SqlClient::SqlRowUpdatingEventHandler ^ RowUpdating;
[System.Data.DataSysDescription("DbDataAdapter_RowUpdating")]
public event System.Data.SqlClient.SqlRowUpdatingEventHandler RowUpdating;
member this.RowUpdating : System.Data.SqlClient.SqlRowUpdatingEventHandler 
Public Custom Event RowUpdating As SqlRowUpdatingEventHandler 
Atributos

Ejemplos

En el ejemplo siguiente se muestra cómo utilizar los eventos RowUpdating y RowUpdated.The following example shows how to use both the RowUpdating and RowUpdated events.

El evento RowUpdating devuelve este resultado:The RowUpdating event returns this output:

argumentos del evento: (comando = System. Data. SqlClient. SqlCommand commandType = 2 Status = 0)event args: (command=System.Data.SqlClient.SqlCommand commandType=2 status=0)

El evento RowUpdated devuelve este resultado:The RowUpdated event returns this output:

argumentos del evento: (Command = System. Data. SqlClient. SqlCommand commandType = 2 recordsAffected = 1 Row = System. Data. DataRow [37] Status = 0)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 = 
                 "Integrated Security=SSPI;database=Northwind;server=MSSQL1";
       const string queryString = "SELECT * FROM Products";

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

       // Create and fill DataSet (select only first 5 rows)
       DataSet dataSet = new DataSet();
       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 
    
    'Entry point which delegates to C-style main Private Function
    Public Overloads Shared Sub Main()
        System.Environment.ExitCode = Main(System.Environment.GetCommandLineArgs())
    End Sub
    
    Overloads Public Shared Function Main(args() As String) As Integer
        Const connectionString As String = _
            "Integrated Security=SSPI;database=Northwind;server=MSSQL1"
        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 
    
    
    Overloads Private 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 
    
    
    Overloads Private 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 

Comentarios

Cuando se usa Update, hay dos eventos que se producen por fila de datos actualizada.When using Update, there are two events that occur per data row updated. El orden de ejecución es el siguiente:The order of execution is as follows:

  1. Los valores de la DataRow se mueven a los valores de parámetro.The values in the DataRow are moved to the parameter values.

  2. Se genera el evento OnRowUpdating.The OnRowUpdating event is raised.

  3. Se ejecuta el comando.The command executes.

  4. Si el comando se establece en FirstReturnedRecord, el primer resultado devuelto se coloca en el DataRow.If the command is set to FirstReturnedRecord, the first returned result is placed in the DataRow.

  5. Si hay parámetros de salida, se colocan en el DataRow.If there are output parameters, they are placed in the DataRow.

  6. Se genera el evento OnRowUpdated.The OnRowUpdated event is raised.

  7. Se llama a AcceptChanges.AcceptChanges is called.

Se aplica a

Consulte también: