SqlBulkCopy.NotifyAfter Property
Defines the number of rows to be processed before generating a notification event.
Assembly: System.Data (in System.Data.dll)
Property Value
Type: System.Int32The integer value of the NotifyAfter property, or zero if the property has not been set.
This property is designed for user interface components that illustrate the progress of a bulk copy operation. It indicates the number of rows to be processed before generating a notification event. The NotifyAfter property can be set at any time, even while a bulk copy operation is underway. Changes made during a bulk copy operation take effect after the next notification. The new setting applies to all subsequent operations on the same instance.
If NotifyAfter is set to a number less than zero, an ArgumentOutOfRangeException is thrown.
The following console application demonstrates how to bulk load data using a connection that is already open. The NotifyAfter property is set so that the event handler is called after every 50 rows copied to the table.
In this example, the connection is first used to read data from a SQL Server table to a SqlDataReader instance. Then a second connection is opened to bulk copy the data. Note that the source data does not have to be located on SQL Server; you can use any data source that can be read to an IDataReader or loaded to a DataTable.
Important |
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This sample will not run unless you have created the work tables as described in Bulk Copy Example Setup. This code is provided to demonstrate the syntax for using SqlBulkCopy only. If the source and destination tables are in the same SQL Server instance, it is easier and faster to use a Transact-SQL INSERT … SELECT statement to copy the data. |
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
Available since 2.0
