c# wpf print barcode Dim reader As SqlDataReader = GetCustomersCommand.ExecuteReader in .NET framework

Creating QR in .NET framework Dim reader As SqlDataReader = GetCustomersCommand.ExecuteReader

Dim reader As SqlDataReader = GetCustomersCommand.ExecuteReader
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Dim BulkCopier As New SqlBulkCopy _ (SourceConnection.ConnectionString, SqlBulkCopyOptions.UseInternalTransaction) BulkCopier.BatchSize = 50 BulkCopier.DestinationTableName = "CustomerHistory"
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BulkCopier.WriteToServer(reader)
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Catch ex As Exception
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MessageBox.Show(ex.Message)
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Finally
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6
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BulkCopier.Close()
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reader.Close()
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SourceConnection.Close()
End Try
End Sub
// C# private void BulkCopyCustomers()
SqlCommand GetCustomersCommand = new SqlCommand _
("SELECT * FROM Customers", SourceConnection);
SourceConnection.Open();
SqlDataReader reader = GetCustomersCommand.ExecuteReader();
SqlBulkCopy BulkCopier = new SqlBulkCopy _
(SourceConnection.ConnectionString, SqlBulkCopyOptions.UseInternalTransaction); BulkCopier.BatchSize = 50; BulkCopier.DestinationTableName = "CustomerHistory"; try
BulkCopier.WriteToServer(reader);
catch (Exception ex)
MessageBox.Show(ex.Message);
finally
BulkCopier.Close();
reader.Close();
SourceConnection.Close();
9. Add the BulkCopyCustomers method call into the BulkCopyButton.Click event handler. 10. Run the application and click the Prepare Table button. 11. With the application running, navigate to Server Explorer, right-click the Cus tomerHistory table, and select Show Table Data. 12. If the CustomerHistory table was filled with data from the last exercise, you should now see only the record for White Clover Markets. Select this record and delete it! (If you didn t complete the last exercise and your table is already empty, that is fine.)
Lesson 4: Performing Bulk Copy Operations
13. Navigate back to the running application and click the Execute Bulk Copy but ton. The operation should complete successfully and copy the entire Customers table into the CustomerHistory table. 14. Go back to Server Explorer and look at the data in the CustomerHistory table; it should contain all 91 records. 15. Go back to the running form and, once again, click the Prepare Table button. 16. Inspect the table data; now there should be only the White Clover Markets record. 17. Go back to the running form and click the Execute Bulk Copy button. This time, you should get a message box to appear, indicating a primary key vio lation. This is due to the attempted insertion of the existing White Clover Mar kets record. 18. Click OK in the message box and inspect the table data again. What you see are 51 records the first bulk copy batch of 50 (the batch size you set in code) and the original WHITC record. Notice that the records between the fiftieth and WHITC (which is actually the eighty-ninth record in the table) did not get inserted; the transaction rolled those inserts back because they were all part of the same batch that was part of the internal transaction.
Lesson Summary
Bulk copying provides an efficient way to copy large amounts of data. The SqlBulkCopy object provides a .NET Framework class to perform bulk copy operations in your application. The SQL BULK INSERT statement provides a way to perform bulk copy opera tions using the resources in SQL Server. Bulk copy operations can be performed from within a transaction.
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
6
Working with Data in a Connected Environment
NOTE
Answers
Answers to these questions and explanations of why each choice is correct or incorrect are located in the Answers section at the end of the book.
1. How many connection objects are needed to perform a bulk copy operation using the SqlBulkCopy object (Choose all that apply.) A. One connection for each database the application needs to connect to B. Two connections for each database the application needs to connect to C. Two connections total, one connection for the source database, and one connection for the destination database 2. Where does the SQL BULK INSERT statement usually get the data to copy A. From a data file created with the .bcp utility B. From a query executed by a Command object C. From a DataReader D. From a database table in either the same or another database 3. How many records are copied when performing a bulk copy operation in an internal transaction that fails A. All records up until the transaction fails. B. It depends on the batch size and how many successful batches were copied before the transaction failed. C. All records from all batches except for the batch where the transaction failed. D. No records are copied because the transaction failed.
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