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The next section builds on this example, so do not discard the application.
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Add Functionality to Demonstrate Executing the SQL BULK INSERT Statement
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In addition to copying a large amount of data with the SqlBulkCopy object, you can also configure Command objects to take advantage of SQL Server features that perform
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Working with Data in a Connected Environment
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efficient bulk copying. SQL Server provides a BULK INSERT statement for copying data from data files into SQL tables. Create data files with the .bcp utility provided by SQL Server. Although creating data and format files is beyond the scope of this book, they are included on the CD for this example. Copy the Customers.fmt and NorthwindCustomers.txt files from the CD to the C:\DataSources directory. (You can actually copy these anywhere on your hard drive as long as you point to the correct path in the code example.)
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When executing the BulkInsertStatement in the example below, keep in mind the path being passed to the statement is relative to the database server so be sure the file exists at the indicated path on the server before executing the command.
The NorthwindCustomers.txt file contains all 91 records from the Customers table and the SQL BULK INSERT statement will populate the CustomerHistory table cre ated in the previous section. 1. Delete all the records from the CustomerHistory table so that it is empty. 2. Add a button to the form (below the Copy Orders button) and set the following properties:
Name = ExecuteBulkInsertButton Text = BULK INSERT
3. Double-click the BULK INSERT button and add the following code into the but ton click event handler (modify the path if necessary):
' VB Dim BulkInsertStatement As String = "BULK INSERT CustomerHistory " & _
"FROM 'C:\Datasources\NorthwindCustomers.txt'"
Dim BulkInsertCommand As New SqlCommand(BulkInsertStatement, SourceConnection) Try
SourceConnection.Open()
BulkInsertCommand.ExecuteNonQuery()
Catch ex As Exception
MessageBox.Show(ex.Message)
Finally
SourceConnection.Close()
End Try
// C# string BulkInsertStatement = "BULK INSERT CustomerHistory " +
Lesson 4: Performing Bulk Copy Operations
"FROM 'C:\\Datasources\\NorthwindCustomers.txt'"; SqlCommand BulkInsertCommand = new SqlCommand(BulkInsertStatement, SourceConnection); try {
SourceConnection.Open();
BulkInsertCommand.ExecuteNonQuery();
catch (Exception ex)
MessageBox.Show(ex.Message);
finally
SourceConnection.Close();
4. Run the application. 5. Click the BULK INSERT button. 6. Inspect the CustomerHistory table s data and verify that the data was success fully inserted. You may need to refresh the table if it is already opened in the doc ument window.
Exercise 2: Perform Bulk Copy Operations in a Transaction
In this next bulk copy exercise, you will perform basically the same bulk copy action as you did in the last exercise, using only the Customers data, but this time, you will wrap the copy operation in a transaction. You will set the batch size to copy 50 records at a time, causing two separate sets of rows to copy because the Customers table contains 91 records. 1. Create a new Windows application and name it BulkCopyTransaction. 2. Add a button to the form and set the following properties:
Name = PrepareTableButton Text = Prepare Table Name = BulkCopyButton Text = Execute Bulk Copy
3. Add a second button to the form and set the following properties:
4. Double-click the Execute Bulk Copy button to create an event handler. 5. Add references to the System.Data and System.Data.SqlClient namespaces.
6
Working with Data in a Connected Environment
6. This example needs only one connection, so add a SourceConnection to the form. When using an internal transaction, the SqlBulkCopy object creates the destina tion connection when it is instantiated. At this point, your form code should look like the following (substitute a valid connection string for the SourceConnection object):
' VB Imports System.Data
Imports System.Data.SqlClient
Public Class Form1 Private SourceConnection As New SqlConnection _ ("Data Source=.\sqlexpress;Initial Catalog=Northwind;Integrated Security=True") Private Sub BulkCopyButton _Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles BulkCopyButton.Click
End Sub
End Class
// C# using using using using using using using using
System;
System.Collections.Generic;
System.ComponentModel;
System.Data;
System.Drawing;
System.Text;
System.Windows.Forms;
System.Data.SqlClient;
namespace BulkCopyTransactionCS {
public partial class Form1 : Form
public Form1()
InitializeComponent();
private SqlConnection SourceConnection = new SqlConnection _
("Data Source=.\\SqlExpress;Initial Catalog=Northwind;Integrated
Security=True");
private void BulkCopyButton_Click(object sender, EventArgs e) { }
Lesson 4: Performing Bulk Copy Operations
To verify that the transaction performs as expected, you actually want part of the bulk copy operation to fail. To accomplish this, leave a single record in the CustomerHistory table to force a primary key violation and cause the transac tion to roll back the active batch and without updating any records. To leave this spoiler record, you ll create a PrepareTable method that deletes all records in the CustomerHistory table except for the record for White Clover Markets (WHITC). 7. Double-click the Prepare Table button and add the following code to the event handler:
' VB Dim GetCustomersCommand As New SqlCommand _ ("DELETE FROM CustomerHistory WHERE CustomerID <> 'WHITC'", SourceConnection) SourceConnection.Open() GetCustomersCommand.ExecuteNonQuery() SourceConnection.Close() // C# SqlCommand GetCustomersCommand = new SqlCommand _ ("DELETE FROM CustomerHistory WHERE CustomerID <> 'WHITC'", SourceConnection); SourceConnection.Open(); GetCustomersCommand.ExecuteNonQuery(); SourceConnection.Close();
8. Add the following code to the form: These methods are the code that performs the actual Bulk Copy operation using the SqlBulkCopy object. The source and destination connections are used to trans fer the data, 50 records at a time (BatchSize property). The DestinationTableName is where the data is copied to.
' VB Private Sub BulkCopyCustomers()
Dim GetCustomersCommand As New SqlCommand _
("SELECT * FROM Customers", SourceConnection)
SourceConnection.Open()
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