OleDbDataReader.Read Method ()

 

Advances the OleDbDataReader to the next record.

Namespace:   System.Data.OleDb
Assembly:  System.Data (in System.Data.dll)

Public Overrides Function Read As Boolean

Return Value

Type: System.Boolean

true if there are more rows; otherwise, false.

The default position of the OleDbDataReader is before the first record. Therefore, you must call Read to start accessing any data.

While the OleDbDataReader is being used, the associated OleDbConnection is busy serving it until you call Close.

The following example creates an OleDbConnection, an OleDbCommand, and an OleDbDataReader. The example reads through the data, writing it out to the console. Finally, the example closes the OleDbDataReader and then the OleDbConnection.

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

.NET Framework
Available since 1.1
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