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OracleDataReader.Read Method

Advances the OracleDataReader to the next record.

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

'Declaration
Public Overrides Function Read As Boolean

Return Value

Type: System.Boolean
true if there are more rows; otherwise, false.

Implements

IDataReader.Read

The default position of the OracleDataReader is prior to the first record. Therefore, you must call Read to begin accessing any data.

More than one OracleDataReader can be open at any given time.

The following example creates an OracleConnection, an OracleCommand, and an OracleDataReader. The example reads through the data, writing it out to the console. Finally, the example closes the OracleDataReader, then the OracleConnection.

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

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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