SqlBulkCopy.SqlRowsCopied Kejadian
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Terjadi setiap kali jumlah baris yang ditentukan oleh NotifyAfter properti telah diproses.
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 Jenis Acara
Contoh
Aplikasi konsol berikut menunjukkan cara memuat data secara massal menggunakan koneksi yang sudah terbuka. Properti NotifyAfter diatur sehingga penanganan aktivitas dipanggil setelah setiap 50 baris disalin ke tabel.
Dalam contoh ini, koneksi pertama kali digunakan untuk membaca data dari tabel SQL Server ke SqlDataReader instans. Perhatikan bahwa data sumber tidak harus berada di SQL Server; Anda dapat menggunakan sumber data apa pun yang dapat dibaca ke IDataReader atau dimuat ke DataTable.
Penting
Sampel ini tidak akan berjalan kecuali Anda telah membuat tabel kerja seperti yang dijelaskan dalam Penyiapan Contoh Salinan Massal. Kode ini disediakan untuk mendemonstrasikan sintaks untuk menggunakan SqlBulkCopy saja. Jika tabel sumber dan tujuan berada dalam instans SQL Server yang sama, lebih mudah dan lebih cepat untuk menggunakan pernyataan Transact-SQL INSERT ... SELECT untuk menyalin data.
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
Keterangan
Perhatikan bahwa pengaturan NotifyAfter dan BatchSize independen. Tanda terima SqlRowsCopied peristiwa tidak menyiratkan bahwa baris apa pun telah dikirim ke server atau diterapkan.
Anda tidak dapat memanggil SqlBulkCopy.Close (Close) atau SqlConnection.Close (Close) dari kejadian ini. Melakukan ini akan menyebabkan dilemparkan InvalidOperationException , dan status SqlBulkCopy objek tidak akan berubah. Jika pengguna ingin membatalkan operasi dari peristiwa, Abort properti SqlRowsCopiedEventArgs dari dapat digunakan. (Lihat Operasi Transaksi dan Salin Massal untuk contoh yang menggunakan Abort properti .)
Tidak ada tindakan, seperti aktivitas transaksi, didukung dalam koneksi selama eksekusi operasi penyalinan massal, dan disarankan agar Anda tidak menggunakan koneksi yang sama yang digunakan selama peristiwa.SqlRowsCopied Namun, Anda dapat membuka koneksi yang berbeda.
