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Simple text (also called ASCII characters) is the usual output of a console application, but some console applications use ASCII graphic characters. (ASCII stands for American Standard Code for Information Interchange.) An ASCII code is the numerical representation of a character (such as 0 or #) or an action of some sort. Pressing Enter in a word processor to move a line of text is an action represented by an ASCII character, for instance. The ASCII graphic character set, also called extended ASCII characters, includes vertical lines, vertical double lines, corners, and much more. ASCII characters are sometimes used to create boxes around text in console applications. Unicode characters are similar to ASCII but are not encoded in the same way. They are more extensive and can represent different locales.

USE AdventureWorks2008 ; SELECT * FROM HumanResources.Department (READPAST); SELECT * FROM Sales.SalesPerson;

SQL Server skips (reads past) only one row, and the remaining 15 rows of Department are returned, followed by all the SalesPerson rows. The READPAST hint is frequently used in conjunction with a TOP clause, in particular TOP 1, where your table is serving as a work queue. Your SELECT must get a row containing an order to be processed, but it really doesn t matter which row. So SELECT TOP 1 * FROM <OrderTable> returns the rst unlocked row, and you can use that as the row to start processing. 4. Open a fourth connection, and execute the following statements:

USE AdventureWorks2008 ; SELECT * FROM HumanResources.Department (READUNCOMMITTED); SELECT * FROM Sales.SalesPerson;

In this case, SQL Server does not skip anything. It reads all 16 rows from Department, but the row for Department 1 shows the dirty data that you changed in step 1. This data has not yet been committed and is subject to being rolled back. The READUNCOMMITTED hint is probably the least useful because of the availability of row versioning. In fact, anytime you nd yourself needing to use this hint, or the equivalent NOLOCK, you should consider whether you can actually afford the cost of one of the snapshot-based isolation levels.

XML Style Sheets (XSLs) and Transformations (XSLTs)

Summary

In this chapter, you ll create two versions of the same application: a console application and a Microsoft Windows application. You might wonder why you even have to worry about the type of application when you re creating a program. Often the type of application you create depends on the purpose of the application and how users will interact with it. Sometimes your application doesn t need to have a graphical interface. For instance, some applications need to be executed in a script or a batch file, or they don t need a graphical interface because no user usually interacts with the application except for launching it. This type of application is called a console application because everything is displayed in a system console window. You might have heard these types of windows referred to by many different names: a DOS window, a command prompt window, or simply the command window. The most common output in a console application is simple text. Figure 3-1 shows the result of the famous Hello, World application as a console application.

SQL Server lets you manage multiple users simultaneously and ensure that transactions observe the properties of the chosen isolation level. Locking guards data and the internal resources that make it possible for a multiuser system to operate like a single-user system. You can choose to have your databases and applications use either optimistic or pessimistic concurrency control. With pessimistic concurrency, the locks acquired by data modi cation operations block users trying to retrieve data. With optimistic concurrency, the locks are ignored and older committed versions of the data are read instead. In this chapter, we looked at the locking mechanisms in SQL Server, including full locking for data and leaf-level index pages and lightweight locking mechanisms for internally used resources. We also looked at the details of how optimistic concurrency avoids blocking on locks and still has access to data. It is important to understand the issues of lock compatibility and escalation if you want to design and implement high-concurrency applications. You also need to understand the costs and bene ts of the two concurrency models.

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