OleDbDataAdapter.DeleteCommand Propriedade

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

[System.Data.DataSysDescription("DbDataAdapter_DeleteCommand")]
public System.Data.OleDb.OleDbCommand DeleteCommand { get; set; }

public System.Data.OleDb.OleDbCommand DeleteCommand { get; set; }

[<System.Data.DataSysDescription("DbDataAdapter_DeleteCommand")>]
member this.DeleteCommand : System.Data.OleDb.OleDbCommand with get, set

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

Public Property DeleteCommand As OleDbCommand

Valor de Propriedade

E OleDbCommand usado durante Update(DataSet) para eliminar registos na fonte de dados que correspondem a linhas eliminadas no DataSet.

Atributos

DataSysDescriptionAttribute

Exemplos

O exemplo seguinte cria um OleDbDataAdapter e define as SelectCommand propriedades e DeleteCommand . Assume que já criaste um OleDbConnection objeto.

public static OleDbDataAdapter CreateCustomerAdapter(
    OleDbConnection connection)
{
    OleDbDataAdapter dataAdapter = new OleDbDataAdapter();
    OleDbCommand command;
    OleDbParameter parameter;

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

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

    dataAdapter.SelectCommand = command;

    // Create the DeleteCommand.
    command = new OleDbCommand(
        "DELETE * FROM Customers WHERE CustomerID = ?",
        connection);

    parameter = command.Parameters.Add(
        "CustomerID", OleDbType.Char, 5, "CustomerID");
    parameter.SourceVersion = DataRowVersion.Original;

    dataAdapter.DeleteCommand = command;

    return dataAdapter;
}

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

    Dim dataAdapter As New OleDbDataAdapter()
    Dim command As OleDbCommand
    Dim parameter As OleDbParameter

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

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

    dataAdapter.SelectCommand = command

    ' Create the DeleteCommand.
    command = New OleDbCommand( _
        "DELETE * FROM Customers WHERE CustomerID = ?", _
        connection)

    parameter = command.Parameters.Add( _
        "CustomerID", OleDbType.Char, 5, "CustomerID")
    parameter.SourceVersion = DataRowVersion.Original

    dataAdapter.DeleteCommand = command

    Return dataAdapter
End Function

Observações

Durante Update, se esta propriedade não estiver definida e a informação da chave primária estiver presente no DataSet, pode DeleteCommand ser gerado automaticamente se definir a SelectCommand propriedade e usar o OleDbCommandBuilder. Depois, quaisquer comandos adicionais que não definires são gerados pelo OleDbCommandBuilder. Esta lógica de geração exige que a informação da coluna chave esteja presente no DataSet. Para obter mais informações, consulte Gerando comandos com CommandBuilders.

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

Ver também

• Adaptadores de Dados e Leitores de Dados