OdbcDataReader.Read Yöntem

public:
 override bool Read();

public:
 virtual bool Read();

public override bool Read ();

public bool Read ();

override this.Read : unit -> bool

abstract member Read : unit -> bool
override this.Read : unit -> bool

Public Overrides Function Read () As Boolean

Public Function Read () As Boolean

Döndürülenler

true daha fazla satır varsa; aksi takdirde false.

Uygulamalar

Örnekler

Aşağıdaki örnek, bir OdbcConnection, OdbcCommandve OdbcDataReaderoluşturur. Örnek, verileri okuyup konsola yazar. Son olarak, örnek öğesini ve ardından öğesini OdbcConnectionkapatırOdbcDataReader.

private static void ReadData(string connectionString)
{
    string queryString = "SELECT OrderID, CustomerID FROM Orders";
    using (OracleConnection connection = new OracleConnection(connectionString))
    {
        OracleCommand command = new OracleCommand(queryString, connection);
        connection.Open();
        OracleDataReader reader;
        reader = command.ExecuteReader();

        // Always call Read before accessing data.
        while (reader.Read())
        {
            Console.WriteLine(reader.GetInt32(0) + ", " + reader.GetString(1));
        }

        // Always call Close when done reading.
        reader.Close();
    }
}

Public Sub ReadData(ByVal connectionString As String)
    Dim queryString As String = _
        "SELECT OrderID, CustomerID FROM Orders"

    Using connection As New OracleConnection(connectionString)
        Dim command As New OracleCommand(queryString, connection)
        connection.Open()

        Dim reader As OracleDataReader
        reader = command.ExecuteReader()

        ' Always call Read before accessing data.
        While reader.Read()
            Console.WriteLine(reader.GetInt32(0) & ", " & reader.GetString(1))
        End While

        ' Always call Close when done reading.
        reader.Close()
    End Using
End Sub

Açıklamalar

öğesinin OdbcDataReader varsayılan konumu ilk kayıttan öncedir. Bu nedenle, herhangi bir veriye erişmeye başlamak için aramanız Read gerekir.

OdbcDataReader kullanılırken, siz çağırana Closekadar ilişkilendirilmiş OdbcConnection olan hizmetle meşgul olur.

Şunlara uygulanır

Ayrıca bkz.

• DataAdapters ve DataReaders