SqlBulkCopy.NotifyAfter 屬性
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。
定義產生通知事件之前要處理的資料列數目。
public:
property int NotifyAfter { int get(); void set(int value); };public int NotifyAfter { get; set; }member this.NotifyAfter : int with get, setPublic Property NotifyAfter As Integer屬性值
NotifyAfter 屬性的整數值；如果尚未設定這個屬性，則為零。
範例
下列主控台應用程式示範如何使用已經開啟的連接大量載入數據。 屬性 NotifyAfter 會設定為在每 50 個數據列複製到數據表之後呼叫事件處理程式。
在此範例中，聯機會先用來將數據從 SQL Server 數據表讀取至 SqlDataReader 實例。 然後會開啟第二個連線來大量複製數據。 請注意，源數據不一定位於 SQL Server 上;您可以使用可讀取至 IDataReader 或載入至 DataTable的任何數據源。
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。 如果來源和目的地數據表位於相同的 SQL Server 實例中，使用 Transact-SQL INSERT ... SELECT 語句來複製數據會比較容易且更快速。
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
此屬性是專為說明大量複製作業進度的使用者介面元件所設計。 它會指出在產生通知事件之前要處理的數據列數目。 NotifyAfter屬性可以隨時設定，即使大量複製作業正在進行也一樣。 在大量複製作業期間所做的變更會在下一個通知之後生效。 新的設定會套用至相同實例上的所有後續作業。
如果 NotifyAfter 設定為小於零的數位， ArgumentOutOfRangeException 則會擲回 。
適用於
另請參閱
- 在 SQL Server 中執行大量複製作業
- ADO.NET 概觀 \(部分機器翻譯\)
