SqlBulkCopy.SqlRowsCopied 事件
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
每當處理屬性指定的 NotifyAfter 列數時，都會發生。
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 事件類型
範例
以下主控台應用程式示範如何利用已開啟的連線批量載入資料。 NotifyAfter該屬性設定為每複製 50 列到資料表後呼叫事件處理器。
在此範例中，連線首先用於從 SQL Server 資料表讀取資料到實 SqlDataReader 例。 請注意，來源資料不必位於 SQL Server;你可以使用任何可讀取或 IDataReader 載入到 DataTable的資料來源。
這很重要
除非您已如大量複製範例設定中所述建立工作資料表，否則將不會執行此範例。 這個程式碼僅是為了示範使用 SqlBulkCopy 的語法而提供。 如果來源和目的資料表在同一個 SQL Server 實例中，使用 Transact-SQL INSERT ... SELECT 語句來複製資料會更簡單且快速。
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
備註
請注意，和 BatchSize 的NotifyAfter設定是獨立的。 收到 SqlRowsCopied 事件並不代表有任何列已送達伺服器或已提交。
你不能從這個事件呼叫 SqlBulkCopy.Close （Close） 或 SqlConnection.Close （Close）。 這樣做會導致 InvalidOperationException 被拋出，且 SqlBulkCopy 物件狀態不會改變。 如果使用者想取消事件中的操作， Abort 可以使用 的 SqlRowsCopiedEventArgs 屬性。 （請參見 交易與批量複製操作 以了解使用此 Abort 特性的範例。）
在執行批量複製操作時，連線中不支援任何動作，例如交易活動，建議不要使用事件中 SqlRowsCopied 相同的連線。 不過，你可以開啟不同的連結。
