OleDbDataAdapter.SelectCommand Propriedade

  • Referência

Definição

Namespace:
System.Data.OleDb
Assembly:
System.Data.OleDb.dll
Assembly:
System.Data.dll
Pacote:
System.Data.OleDb v8.0.1
Pacote:
System.Data.OleDb v9.0.0-rc.2.24473.5
Origem:
OleDbDataAdapter.cs
Origem:
OleDbDataAdapter.cs

Obtém ou define uma instrução SQL ou um procedimento armazenado usado para selecionar registros na fonte de dados.

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; }
[System.Data.DataSysDescription("DbDataAdapter_SelectCommand")]
public System.Data.OleDb.OleDbCommand SelectCommand { get; set; }
public System.Data.OleDb.OleDbCommand SelectCommand { get; set; }
member this.SelectCommand : System.Data.OleDb.OleDbCommand with get, set
[<System.Data.DataSysDescription("DbDataAdapter_SelectCommand")>]
member this.SelectCommand : System.Data.OleDb.OleDbCommand with get, set
Public Property SelectCommand As OleDbCommand

Valor da propriedade

OleDbCommand

Um OleDbCommand que é usado durante o Fill(DataSet) para selecionar registros da fonte de dados para o posicionamento no DataSet.

Atributos
DataSysDescriptionAttribute

Exemplos

O exemplo a seguir cria um OleDbDataAdapter e define as SelectCommand propriedades e InsertCommand . Ele pressupõe que você já tenha criado um 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

Comentários

Quando SelectCommand é atribuído a um criado OleDbCommandanteriormente, o OleDbCommand não é clonado. O SelectCommand mantém uma referência ao objeto criado OleDbCommand anteriormente.

Se o SelectCommand não retornar linhas, nenhuma tabela será adicionada ao DataSete nenhuma exceção será gerada.

Aplica-se a

Confira também