SqlCeResultSet.Delete Método
Elimina el registro actual del origen de datos situado en el servidor.
Espacio de nombres: System.Data.SqlServerCe
Ensamblado: System.Data.SqlServerCe (en System.Data.SqlServerCe.dll)
Sintaxis
'Declaración
<SecurityCriticalAttribute> _
<SecurityTreatAsSafeAttribute> _
<SecurityPermissionAttribute(SecurityAction.Assert, UnmanagedCode := True)> _
Public Sub Delete
'Uso
Dim instance As SqlCeResultSet
instance.Delete()
[SecurityCriticalAttribute]
[SecurityTreatAsSafeAttribute]
[SecurityPermissionAttribute(SecurityAction.Assert, UnmanagedCode = true)]
public void Delete()
[SecurityCriticalAttribute]
[SecurityTreatAsSafeAttribute]
[SecurityPermissionAttribute(SecurityAction::Assert, UnmanagedCode = true)]
public:
void Delete()
[<SecurityCriticalAttribute>]
[<SecurityTreatAsSafeAttribute>]
[<SecurityPermissionAttribute(SecurityAction.Assert, UnmanagedCode = true)>]
member Delete : unit -> unit
public function Delete()
Comentarios
Al llamar a este método, no se cambia la posición actual del cursor SqlCeResultSet.
Si se hace una llamada a este método con un lector no actualizable, o si el lector no se encuentra situado en un registro válido, se produce una excepción InvalidOperationException.
Ejemplos
El ejemplo siguiente muestra cómo eliminar un registro de un cursor SqlCeResultSet.
Dim conn As SqlCeConnection = Nothing
Try
File.Delete("Test.sdf")
Dim engine As New SqlCeEngine("Data Source = Test.sdf")
engine.CreateDatabase()
conn = New SqlCeConnection("Data Source = Test.sdf")
conn.Open()
Dim cmd As SqlCeCommand = conn.CreateCommand()
cmd.CommandText = "CREATE TABLE myTable (col1 INT)"
cmd.ExecuteNonQuery()
cmd.CommandText = "SELECT * FROM myTable"
Dim rs As SqlCeResultSet = cmd.ExecuteResultSet(ResultSetOptions.Updatable Or ResultSetOptions.Scrollable)
Dim rec As SqlCeUpdatableRecord = rs.CreateRecord()
' Insert 10 records
'
Dim i As Integer
For i = 0 To 9
rec.SetInt32(0, i)
rs.Insert(rec)
Next i
' Update the 5th record
'
If True = rs.ReadAbsolute(5) Then
rs.SetInt32(0, 55)
rs.Update()
End If
' Delete the 2nd record
'
If True = rs.ReadAbsolute(2) Then
rs.Delete()
End If
Catch e As Exception
MessageBox.Show(e.Message)
Finally
conn.Close()
End Try
SqlCeConnection conn = null;
try
{
File.Delete("Test.sdf");
SqlCeEngine engine = new SqlCeEngine("Data Source = Test.sdf");
engine.CreateDatabase();
conn = new SqlCeConnection("Data Source = Test.sdf");
conn.Open();
SqlCeCommand cmd = conn.CreateCommand();
cmd.CommandText = "CREATE TABLE myTable (col1 INT)";
cmd.ExecuteNonQuery();
cmd.CommandText = "SELECT * FROM myTable";
SqlCeResultSet rs = cmd.ExecuteResultSet(ResultSetOptions.Updatable |
ResultSetOptions.Scrollable);
SqlCeUpdatableRecord rec = rs.CreateRecord();
// Insert 10 records
//
for (int i = 0; i < 10; i++)
{
rec.SetInt32(0, i);
rs.Insert(rec);
}
// Update the 5th record
//
if (true == rs.ReadAbsolute(5))
{
rs.SetInt32(0, 55);
rs.Update();
}
// Delete the 2nd record
//
if (true == rs.ReadAbsolute(2))
{
rs.Delete();
}
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
finally
{
conn.Close();
}