OleDbDataAdapter.SelectCommand Propiedad

Definición

Espacio de nombres:

System.Data.OleDb

Ensamblado:

System.Data.OleDb.dll

Paquete:

System.Data.OleDb v8.0.0

Source:

OleDbDataAdapter.cs

Obtiene o establece la instrucción SQL o el procedimiento almacenado utilizado para seleccionar registros del origen de datos.

public:
 property System::Data::OleDb::OleDbCommand ^ SelectCommand { System::Data::OleDb::OleDbCommand ^ get(); void set(System::Data::OleDb::OleDbCommand ^ value); };

public System.Data.OleDb.OleDbCommand? SelectCommand { get; set; }

member this.SelectCommand : System.Data.OleDb.OleDbCommand with get, set

Public Property SelectCommand As OleDbCommand

Valor de propiedad

OleDbCommand

OleDbCommand que se utiliza durante Fill(DataSet) para seleccionar registros del origen de datos y colocarlos en DataSet.

Ejemplos

En el ejemplo siguiente se crea y OleDbDataAdapter se establecen las SelectCommand propiedades y InsertCommand . Se supone que ya ha creado un OleDbConnection objeto .

public static OleDbDataAdapter CreateCustomerAdapter(
    OleDbConnection connection)
{
    OleDbDataAdapter adapter = new OleDbDataAdapter();
    OleDbCommand command;

    // Create the SelectCommand.
    command = new OleDbCommand("SELECT * FROM Customers " +
        "WHERE Country = ? AND City = ?", connection);

    command.Parameters.Add("Country", OleDbType.VarChar, 15);
    command.Parameters.Add("City", OleDbType.VarChar, 15);

    adapter.SelectCommand = command;

    // Create the InsertCommand.
    command = new OleDbCommand(
        "INSERT INTO Customers (CustomerID, CompanyName) " +
        "VALUES (?, ?)", connection);

    command.Parameters.Add(
        "CustomerID", OleDbType.Char, 5, "CustomerID");
    command.Parameters.Add(
        "CompanyName", OleDbType.VarChar, 40, "CompanyName");

    adapter.InsertCommand = command;
    return adapter;
}

Public Shared Function CreateCustomerAdapter( _
    connection As OleDbConnection) As OleDbDataAdapter 

    Dim adapter As New OleDbDataAdapter()
    Dim command As OleDbCommand

    ' Create the SelectCommand.
    command = New OleDbCommand("SELECT * FROM Customers " & _
        "WHERE Country = ? AND City = ?", connection)

    command.Parameters.Add("Country", OleDbType.VarChar, 15)
    command.Parameters.Add("City", OleDbType.VarChar, 15)

    adapter.SelectCommand = command

    ' Create the InsertCommand.
    command = New OleDbCommand( _
        "INSERT INTO Customers (CustomerID, CompanyName) " & _
        "VALUES (?, ?)", connection)

    command.Parameters.Add( _
        "CustomerID", OleDbType.Char, 5, "CustomerID")
    command.Parameters.Add( _
        "CompanyName", OleDbType.VarChar, 40, "CompanyName")

    adapter.InsertCommand = command
    Return adapter
End Function

Comentarios

Cuando SelectCommand se asigna a un objeto creado OleDbCommandanteriormente, OleDbCommand no se clona. SelectCommand mantiene una referencia al objeto creado OleDbCommand anteriormente.

Si no SelectCommand devuelve ninguna fila, no se agregan tablas a DataSety no se genera ninguna excepción.

Consulte también

• Objetos DataAdapter y DataReader