OleDbDataReader.GetValues(Object[]) Metoda

public:
 override int GetValues(cli::array <System::Object ^> ^ values);

public:
 virtual int GetValues(cli::array <System::Object ^> ^ values);

public override int GetValues (object[] values);

public int GetValues (object[] values);

override this.GetValues : obj[] -> int

abstract member GetValues : obj[] -> int
override this.GetValues : obj[] -> int

Public Overrides Function GetValues (values As Object()) As Integer

Public Function GetValues (values As Object()) As Integer

Parametry

Zwraca

Int32

Liczba wystąpień Object w tablicy.The number of instances of Object in the array.

Implementuje

Przykłady

using System;
using System.Data;
using System.Data.OleDb;

class Class1 {
   public static void Main() {
      using (OleDbConnection connection =
         new OleDbConnection("Provider=SQLOLEDB;Data Source=(local);Integrated Security=SSPI;Initial Catalog=Northwind")) {

         object[] meta = new object[10];
         bool read;

         OleDbCommand command = new OleDbCommand("select * from Region", connection);

         connection.Open();
         OleDbDataReader reader = command.ExecuteReader();

         if (reader.Read() == true) {
            do {
               int NumberOfColums = reader.GetValues(meta);

               for (int i = 0; i < NumberOfColums; i++)
                  Console.Write("{0} ", meta[i].ToString());

               Console.WriteLine();
               read = reader.Read();
            } while (read == true);
         }
         reader.Close();
      }
   }
}

Imports System.Data
Imports System.Data.OleDb

Module Module1
   Public Sub Main()
      Using connection As New OleDbConnection("Provider=SQLOLEDB;Data Source=(local);Integrated Security=SSPI;Initial Catalog=Northwind")
         Dim command As New OleDbCommand("select * from Region", connection)

         connection.Open()
         Dim reader As OleDbDataReader = command.ExecuteReader()

         Dim NumberOfColums As Integer
         Dim meta As Object() = New Object(10) {}
         Dim read As Boolean

         If reader.Read() = True Then
            Do
               NumberOfColums = reader.GetValues(meta)

               For i As Integer = 0 To NumberOfColums - 1
                  Console.Write("{0} ", meta(i).ToString())
               Next

               Console.WriteLine()
               read = reader.Read()
            Loop While read = True
         End If

         reader.Close()
      End Using
   End Sub
End Module

Uwagi

W przypadku większości aplikacji GetValues Metoda zapewnia efektywny sposób pobierania wszystkich kolumn, a nie pobiera poszczególnych kolumn pojedynczo.For most applications, the GetValues method provides an efficient means for retrieving all columns, instead of retrieving each column individually.

Można przekazać Object tablicę zawierającą mniej niż liczbę kolumn zawartych w wierszu wyników.You can pass an Object array that contains fewer than the number of columns that are contained in the resulting row. Tylko ilość danych, które Object zostały przechowywane przez tablicę, jest kopiowana do tablicy.Only the amount of data the Object array holds is copied to the array. Można również przekazać Object tablicę, której długość jest większa niż liczba kolumn zawartych w wierszu.You can also pass an Object array whose length is more than the number of columns that are contained in the resulting row.

Ta metoda zwraca DBNull dla kolumn bazy danych o wartości null.This method returns DBNull for null database columns.

Dotyczy

Zobacz też

• Elementy DataAdapter i DataReaderDataAdapters and DataReaders