IDbDataAdapter.SelectCommand Properti

Definisi

Ruang nama:

System.Data

Rakitan:

System.Data.Common.dll

Mendapatkan atau mengatur pernyataan SQL yang digunakan untuk memilih rekaman di sumber data.

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

public System.Data.IDbCommand? SelectCommand { get; set; }

member this.SelectCommand : System.Data.IDbCommand with get, set

Public Property SelectCommand As IDbCommand

Nilai Properti

IDbCommand

Yang IDbCommand digunakan selama Update(DataSet) memilih rekaman dari sumber data untuk penempatan dalam himpunan data.

Contoh

Contoh berikut membuat instans kelas yang diwariskan OleDbDataAdapter , dan mengatur SelectCommand properti dan InsertCommand . Ini mengasumsikan Anda telah membuat OleDbConnection objek.

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

Keterangan

Ketika SelectCommand ditetapkan ke yang dibuat IDbCommandsebelumnya , IDbCommand tidak dikloning. SelectCommand mempertahankan referensi ke objek yang dibuat IDbCommand sebelumnya.

SelectCommand Jika tidak mengembalikan baris apa pun, tidak ada tabel yang ditambahkan ke DataSet, dan tidak ada pengecualian yang dinaikkan.