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OleDbDataAdapter.DeleteCommand Properti

Definisi

Mendapatkan atau mengatur pernyataan SQL atau prosedur tersimpan untuk menghapus rekaman dari himpunan data.

public:
 property System::Data::OleDb::OleDbCommand ^ DeleteCommand { System::Data::OleDb::OleDbCommand ^ get(); void set(System::Data::OleDb::OleDbCommand ^ value); };
public System.Data.OleDb.OleDbCommand? DeleteCommand { get; set; }
[System.Data.DataSysDescription("DbDataAdapter_DeleteCommand")]
public System.Data.OleDb.OleDbCommand DeleteCommand { get; set; }
public System.Data.OleDb.OleDbCommand DeleteCommand { get; set; }
member this.DeleteCommand : System.Data.OleDb.OleDbCommand with get, set
[<System.Data.DataSysDescription("DbDataAdapter_DeleteCommand")>]
member this.DeleteCommand : System.Data.OleDb.OleDbCommand with get, set
Public Property DeleteCommand As OleDbCommand

Nilai Properti

Yang OleDbCommand digunakan selama Update(DataSet) untuk menghapus rekaman di sumber data yang sesuai dengan baris yang dihapus di DataSet.

Atribut

Contoh

Contoh berikut membuat OleDbDataAdapter dan mengatur SelectCommand properti dan DeleteCommand . Ini mengasumsikan bahwa Anda telah membuat OleDbConnection objek.

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

Keterangan

Selama Update, jika properti ini tidak diatur dan informasi kunci primer ada di DataSet, DeleteCommand dapat dihasilkan secara otomatis jika Anda mengatur SelectCommand properti dan menggunakan OleDbCommandBuilder. Kemudian, setiap perintah tambahan yang tidak Anda tetapkan dihasilkan oleh OleDbCommandBuilder. Logika generasi ini memerlukan informasi kolom kunci untuk hadir di DataSet. Untuk mendapatkan informasi selengkapnya, lihat Menghasilkan Perintah dengan CommandBuilders.

Ketika DeleteCommand ditetapkan ke yang dibuat OleDbCommandsebelumnya , OleDbCommand tidak dikloning. DeleteCommand mempertahankan referensi ke objek yang dibuat OleDbCommand sebelumnya.

Berlaku untuk

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