BEGIN TRANSACTION in .NET

Printer PDF417 in .NET BEGIN TRANSACTION

BEGIN TRANSACTION
Paint PDF417 In .NET
Using Barcode generation for VS .NET Control to generate, create PDF 417 image in VS .NET applications.
www.OnBarcode.com
PDF 417 Scanner In VS .NET
Using Barcode reader for .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
4. A transaction starts. Any data modification you do will not be visible to other connections. 5. Type the following query and execute it:
Barcode Creator In VS .NET
Using Barcode creation for .NET framework Control to generate, create bar code image in .NET applications.
www.OnBarcode.com
Recognize Bar Code In .NET Framework
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
UPDATE HumanResources.Employee SET Title = 'TestTitle' WHERE EmployeeId = 150
Creating PDF417 In Visual C#
Using Barcode printer for VS .NET Control to generate, create PDF417 image in .NET framework applications.
www.OnBarcode.com
PDF 417 Creator In .NET Framework
Using Barcode maker for ASP.NET Control to generate, create PDF 417 image in ASP.NET applications.
www.OnBarcode.com
6. To verify the modification, type the following query and execute it:
Creating PDF417 In VB.NET
Using Barcode creation for VS .NET Control to generate, create PDF417 image in .NET framework applications.
www.OnBarcode.com
Make Linear 1D Barcode In .NET
Using Barcode generation for .NET framework Control to generate, create Linear 1D Barcode image in .NET applications.
www.OnBarcode.com
SELECT Title FROM HumanResources.Employee WHERE EmployeeId = 150
ANSI/AIM Code 39 Maker In .NET Framework
Using Barcode drawer for VS .NET Control to generate, create USS Code 39 image in .NET applications.
www.OnBarcode.com
Drawing UPC Code In Visual Studio .NET
Using Barcode maker for Visual Studio .NET Control to generate, create UPC-A image in VS .NET applications.
www.OnBarcode.com
7. TestTitle should be returned. You updated the data, but it is visible only to your connection. 8. Open a new query window and select AdventureWorks as the active database. 9. In the new window, type the following query and execute it:
QR Creation In Visual Studio .NET
Using Barcode creation for VS .NET Control to generate, create Quick Response Code image in Visual Studio .NET applications.
www.OnBarcode.com
Encode MSI Plessey In .NET
Using Barcode creation for .NET framework Control to generate, create MSI Plessey image in .NET framework applications.
www.OnBarcode.com
SELECT Title FROM HumanResources.Employee WHERE EmployeeId = 150
Creating Barcode In Objective-C
Using Barcode creator for iPhone Control to generate, create bar code image in iPhone applications.
www.OnBarcode.com
Painting GTIN - 12 In Java
Using Barcode creator for Java Control to generate, create UCC - 12 image in Java applications.
www.OnBarcode.com
10. The query does not return because it is waiting for the transaction started in the other window. Go back to the first window, type the following query, and execute it:
GS1 128 Generation In None
Using Barcode generation for Software Control to generate, create EAN128 image in Software applications.
www.OnBarcode.com
UCC - 12 Creator In Java
Using Barcode drawer for Android Control to generate, create USS-128 image in Android applications.
www.OnBarcode.com
ROLLBACK
Creating EAN-13 Supplement 5 In None
Using Barcode creation for Word Control to generate, create EAN13 image in Word applications.
www.OnBarcode.com
Drawing Data Matrix ECC200 In None
Using Barcode generator for Software Control to generate, create Data Matrix image in Software applications.
www.OnBarcode.com
11. The data modification has now been rolled back. Return to the second window, and notice that the query will have completed, returning the data Network Manager .
ECC200 Drawer In Java
Using Barcode maker for Java Control to generate, create Data Matrix 2d barcode image in Java applications.
www.OnBarcode.com
Scan UPC-A In Visual Studio .NET
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Lesson 4: Working with Transactions
Lesson Summary
Use transactions to help ensure that inconsistent data does not get written to the database. Use TRY and CATCH blocks for error handling and to gain better control over transactions.
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.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
1. Which command is used to save the data modified in a transaction so that other connections can see it A. DELETE FROM TRANSACTION B. COMMIT TRANSACTION C. UPDATE TRANSACTION D. SELECT TRANSACTION 2. Which function can be used inside the CATCH block to find out the number for the error that occurred A. ERROR_STATE B. ERROR_MESSAGE C. ERROR_SEVERITY D. ERROR_NUMBER
5 Review
Review
To further practice and reinforce the skills you learned in this chapter, you can
Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-world situations involving the topics of this chapter and ask you to create solutions. Complete the suggested practices. Take a practice test.
Summary
To improve query performance, don t include extraneous tables or columns in queries. Use correlated subqueries or inner joins to return information from other tables with matching data. Use noncorrelated subqueries or outer joins when other tables have nonmatching data. Use the FTS functions to efficiently search text data. Use system functions, UDFs, and aggregate functions to help format output data for business requirements. Avoid cursors; instead, use temporary tables if you need to break up query logic. Use transactions and error handling code to keep inconsistent data out of the database.
5 Review
Key Terms
Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book.
aggregate function case expression cross-tabulation derived table inner join outer join subquery temporary table
Case Scenarios
In the following case scenarios, you will apply what you ve learned in this chapter. You can find answers to these questions in the Answers section at the end of this book.
Case Scenario 1: Database-Backed Authoring Application
Proseware, a textbook organization in San Francisco, CA, is writing a new databasebacked application for authors to use to submit text and various types of changes. The application must take special care to ensure that only well-formed data gets into the database. The database developers have written a series of data-validation stored procedures that throw exceptions if there are issues. Management requires a variety of reports, including the number of submissions by each author and a quarterly report that shows the number of submissions by each author every week for the quarter. 1. How should Proseware write data-insertion code to make sure that no invalid data is stored in the database 2. What aggregate function can be used to determine how many submissions each author had 3. How should the quarterly report be created
Copyright © OnBarcode.com . All rights reserved.