SqlBulkCopy.SqlRowsCopied Händelse

public:
 event System::Data::SqlClient::SqlRowsCopiedEventHandler ^ SqlRowsCopied;

public event System.Data.SqlClient.SqlRowsCopiedEventHandler SqlRowsCopied;

member this.SqlRowsCopied : System.Data.SqlClient.SqlRowsCopiedEventHandler 

Public Custom Event SqlRowsCopied As SqlRowsCopiedEventHandler 

Händelsetyp

Exempel

Följande konsolprogram visar hur du massinläser data med hjälp av en anslutning som redan är öppen. Egenskapen NotifyAfter anges så att händelsehanteraren anropas efter varje 50 rader som kopieras till tabellen.

I det här exemplet används anslutningen först för att läsa data från en SQL Server tabell till en SqlDataReader-instans. Observera att källdata inte behöver finnas på SQL Server. Du kan använda alla datakällor som kan läsas till en IDataReader eller läsas in på en DataTable.

using System.Data.SqlClient;

class Program
{
    static void Main()
    {
        string connectionString = GetConnectionString();
        // Open a sourceConnection to the AdventureWorks database.
        using (SqlConnection sourceConnection =
                   new SqlConnection(connectionString))
        {
            sourceConnection.Open();

            // Perform an initial count on the destination table.
            SqlCommand commandRowCount = new SqlCommand(
                "SELECT COUNT(*) FROM " +
                "dbo.BulkCopyDemoMatchingColumns;",
                sourceConnection);
            long countStart = System.Convert.ToInt32(
                commandRowCount.ExecuteScalar());
            Console.WriteLine("NotifyAfter Sample");
            Console.WriteLine("Starting row count = {0}", countStart);

            // Get data from the source table as a SqlDataReader.
            SqlCommand commandSourceData = new SqlCommand(
                "SELECT ProductID, Name, " +
                "ProductNumber " +
                "FROM Production.Product;", sourceConnection);
            SqlDataReader reader =
                commandSourceData.ExecuteReader();

            // Create the SqlBulkCopy object using a connection string.
            // In the real world you would not use SqlBulkCopy to move
            // data from one table to the other in the same database.
            using (SqlBulkCopy bulkCopy = new SqlBulkCopy(connectionString))
            {
                bulkCopy.DestinationTableName =
                    "dbo.BulkCopyDemoMatchingColumns";

                // Set up the event handler to notify after 50 rows.
                bulkCopy.SqlRowsCopied +=
                    new SqlRowsCopiedEventHandler(OnSqlRowsCopied);
                bulkCopy.NotifyAfter = 50;

                try
                {
                    // Write from the source to the destination.
                    bulkCopy.WriteToServer(reader);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
                finally
                {
                    // Close the SqlDataReader. The SqlBulkCopy
                    // object is automatically closed at the end
                    // of the using block.
                    reader.Close();
                }
            }

            // Perform a final count on the destination
            // table to see how many rows were added.
            long countEnd = System.Convert.ToInt32(
                commandRowCount.ExecuteScalar());
            Console.WriteLine("Ending row count = {0}", countEnd);
            Console.WriteLine("{0} rows were added.", countEnd - countStart);
            Console.WriteLine("Press Enter to finish.");
            Console.ReadLine();
        }
    }

    private static void OnSqlRowsCopied(
        object sender, SqlRowsCopiedEventArgs e)
    {
        Console.WriteLine("Copied {0} so far...", e.RowsCopied);
    }
    private static string GetConnectionString()
        // To avoid storing the sourceConnection string in your code,
        // you can retrieve it from a configuration file.
    {
        return "Data Source=(local); " +
            " Integrated Security=true;" +
            "Initial Catalog=AdventureWorks;";
    }
}

Imports System.Data.SqlClient

Module Module1
    Sub Main()
        Dim connectionString As String = GetConnectionString()

        ' Open a connection to the AdventureWorks database.
        Using sourceConnection As SqlConnection = _
           New SqlConnection(connectionString)
            sourceConnection.Open()

            ' Perform an initial count on the destination table.
            Dim commandRowCount As New SqlCommand( _
            "SELECT COUNT(*) FROM dbo.BulkCopyDemoMatchingColumns;", _
                sourceConnection)
            Dim countStart As Long = _
               System.Convert.ToInt32(commandRowCount.ExecuteScalar())
            Console.WriteLine("NotifyAfter Sample")
            Console.WriteLine("Starting row count = {0}", countStart)

            ' Get data from the source table as a SqlDataReader.
            Dim commandSourceData As SqlCommand = New SqlCommand( _
               "SELECT ProductID, Name, ProductNumber " & _
               "FROM Production.Product;", sourceConnection)
            Dim reader As SqlDataReader = commandSourceData.ExecuteReader

            ' Create the SqlBulkCopy object using a connection string. 
            ' In the real world you would not use SqlBulkCopy to move
            ' data from one table to the other in the same database.
            Using bulkCopy As SqlBulkCopy = _
              New SqlBulkCopy(connectionString)
                bulkCopy.DestinationTableName = "dbo.BulkCopyDemoMatchingColumns"

                ' Set up the event handler to notify after 50 rows.
                AddHandler bulkCopy.SqlRowsCopied, AddressOf OnSqlRowsCopied
                bulkCopy.DestinationTableName = _
                 "dbo.BulkCopyDemoMatchingColumns"
                bulkCopy.NotifyAfter = 50

                Try
                    ' Write from the source to the destination.
                    bulkCopy.WriteToServer(reader)

                Catch ex As Exception
                    Console.WriteLine(ex.Message)

                Finally
                    ' Close the SqlDataReader. The SqlBulkCopy
                    ' object is automatically closed at the end
                    ' of the Using block.
                    reader.Close()
                End Try
            End Using

            ' Perform a final count on the destination table
            ' to see how many rows were added.
            Dim countEnd As Long = _
               System.Convert.ToInt32(commandRowCount.ExecuteScalar())
            Console.WriteLine("Ending row count = {0}", countEnd)
            Console.WriteLine("{0} rows were added.", countEnd - countStart)

            Console.WriteLine("Press Enter to finish.")
            Console.ReadLine()
        End Using
    End Sub

    Private Sub OnSqlRowsCopied(ByVal sender As Object, _
        ByVal args As SqlRowsCopiedEventArgs)
        Console.WriteLine("Copied {0} so far...", args.RowsCopied)
    End Sub

    Private Function GetConnectionString() As String
        ' To avoid storing the sourceConnection string in your code, 
        ' you can retrieve it from a configuration file. 
        Return "Data Source=(local);" & _
            "Integrated Security=true;" & _
            "Initial Catalog=AdventureWorks;"
    End Function
End Module

Kommentarer

Observera att inställningarna NotifyAfter för och BatchSize är oberoende. Mottagandet av en SqlRowsCopied händelse innebär inte att några rader har skickats till servern eller checkats in.

Du kan inte anropa SqlBulkCopy.Close (Close) eller SqlConnection.Close (Close) från den här händelsen. Detta leder till att ett InvalidOperationException utlöses och objekttillståndet SqlBulkCopy ändras inte. Om användaren vill avbryta åtgärden från händelsen Abort kan egenskapen för den SqlRowsCopiedEventArgs användas. (Se Transaktions- och masskopieringsåtgärder för exempel som använder Abort egenskapen.)

Ingen åtgärd, till exempel transaktionsaktivitet, stöds i anslutningen under körningen av masskopieringsåtgärden, och vi rekommenderar att du inte använder samma anslutning som användes under SqlRowsCopied händelsen. Du kan dock öppna en annan anslutning.

Se även

• Masskopieringsåtgärder i SQL Server
• översikt över ADO.NET