Beginning ASP.NET 4.5 in CSharp and VB Opsylum

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440 x CHAPTER 12 INTRODUCTION TO DATABASES 12. Once again, clear the SQL pane and then enter and execute the following query by pressing Ctrl+R: SELECT Id, Name FROM Genre WHERE Id = 13 Replace the Id in the WHERE clause with the ID of the row you determined in step 9. You should see the updated row appear. 13. On the Query Designer toolbar, click the Change Type button and choose Delete. SSMS changes the SQL statement so it is now set up to delete the row with an ID of 13: DELETE FROM Genre WHERE (Id = 13) 14. Press Ctrl+R to execute the query and delete the row from the database. Click OK to dismiss the confirmation dialog box. 15. To confirm that the row is really deleted, click the Change Type button once more and choose Select. Then choose one or more columns of the Genre table in the Diagram pane and press Ctrl+R again. You’ll see that this time no rows are returned, confirming that the newly inserted genre has indeed been deleted from the database. How It Works In this short exercise, you carried out all four parts of the CRUD acronym, which gave you a look at the life cycle of data in a SQL Server database from creation to deletion. You started off with an INSERT statement: INSERT INTO Genre (Name, SortOrder) VALUES ('Folk', 15) This creates a new row in the Genre table. As you see in the next section, the Id column of the Genre table is an identity column, which means that each new row gets a new, sequential ID assigned automatically. To retrieve that ID, you used a SELECT statement with an ORDER BY clause that orders the rows on their IDs in descending order, so the most recent ID was put on top of the list. Retrieving the new ID like this in a busy application is not reliable because you may end up with the ID of a row inserted by someone else. You see later in the book how to retrieve the ID in a reliable way, but for the purposes of this exercise, the ORDER BY method works well enough. Armed with the new ID, you executed an UPDATE statement to change the Name and SortOrder of the newly inserted genre. If you want to update only a single column with the UPDATE statement—say you want to change only the Name—you can simply leave out the other columns. For example, the following UPDATE statement changes only the Name, leaving all other columns at their original values: UPDATE Genre SET Name = 'British Folk' WHERE Id = 13 Finally, at the end of the exercise, you executed a DELETE statement to get rid of the new row. It’s always important to specify a WHERE clause when executing a DELETE or an UPDATE statement to stop you from clearing the entire table or from assigning the same value to all rows. DELETE FROM Genre WHERE (Id = 13)
Creating Your Own Tables x 441 This SQL statement simply deletes the row with an ID of 13. If the row exists, it gets deleted. If the row does not exist, no error is raised, but the dialog box in SSMS shows you that zero rows have been affected. The parentheses are not required in this example, but they help in determining precedence when you have multiple conditions in your WHERE clause. Up to this point, you have seen how to work with existing tables in a database. However, it’s also important to understand how to create new tables with relationships yourself. This is discussed in the next section. CREATING YOUR OWN TABLES Creating tables in a SQL Server database is easy using the database tools that are part of SSMS. You see how you can create your own tables in the database after the next section, which briefly introduces you to the data types at your disposal in SQL Server. Data Types in SQL Server Just as with programming languages like Visual Basic .NET and C#, a SQL Server database uses different data types to store its data. SQL Server 2012 supports more than 30 different data types, most of which look similar to the types used in .NET. The following table lists the most common SQL Server data types together with a description and their .NET counterparts. SQL 2012 DATA TYPE DESCRIPTION .NET DATA TYPE bit Stores boolean values in a 0 / 1 format (1 = True, 0 = False). System.Boolean char / nchar Contains fixed-length text. When you store text shorter than the defined length, the text is padded with spaces. The nchar stores the data in Unicode format, which enables you to store data for many foreign languages (at the cost of needing twice as much space in the database). System.String datetime Stores a date and a time in the range 1753/1/1 through 9999/12/31. System.DateTime datetime2 Similar to the datetime type, but with a greater precision and range (from 0001/1/1 through 9999/12/31) System.DateTime date Stores a date without the time element. System.DateTime time Stores a time without the date element. System.TimeSpan decimal Enables you to store large, fractional numbers. System.Decimal float Enables you to store large, fractional numbers. System.Double continues
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BEGINNING ASP.NET 4.5 FOREWORD . .
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BEGINNING ASP.NET 4.5 IN C# AND VB
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—To Niek
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CREDITS Acquisitions Editor Mary Ja
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CONTENTS FOREWORD INTRODUCTION xxxi
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CONTENTS Working with Files in Your
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CONTENTS Not All Controls Rely on V
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CONTENTS Skins 245 Creating a Skin
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CONTENTS Providing Feedback to User
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CONTENTS Single Item Controls 455 P
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CONTENTS Authentication: How Can Yo
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CONTENTS Introducing Bundling and M
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INTRODUCTION TO BUILD EFFECTIVE AND
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INTRODUCTION ‰ Chapter 4, “Work
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INTRODUCTION HOW THIS BOOK IS STRUC
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INTRODUCTION ‰ Code shown for the
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INTRODUCTION FIGURE I-2 The Site fo
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BEGINNING ASP.NET 4.5
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2 x CHAPTER 1 GETTING STARTED WITH
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4Working with ASP.NET Server Contro
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Introduction to Server Controls x 1
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Introduction to Server Controls x 1
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A Closer Look at ASP.NET Server Con
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A Closer Look at ASP.NET Server Con
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Types of Controls x 117 FIGURE 4-4
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Types of Controls x 119 The Smart T
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Types of Controls x 121 } DropDownL
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Types of Controls x 123 Container C
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Types of Controls x 125 Note that t
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Types of Controls x 127 FIGURE 4-12
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Types of Controls x 129 FinishButto
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Types of Controls x 131 FileUpload
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Types of Controls x 133 Validation
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The ASP.NET State Engine x 135 serv
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The ASP.NET State Engine x 137 FIGU
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The ASP.NET State Engine x 139 4. A
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Practical Tips on Working with Cont
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Summary x 143 ⊲ WHAT YOU LEARNED
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146 x CHAPTER 5 PROGRAMMING YOUR AS
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6Creating Consistent Looking Websit
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Consistent Page Layout with Master
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Using a Centralized Base Page x 219
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Themes x 229 With this exported tem
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Themes x 231 Replace Theme with Sty
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Themes x 233 type="text/css" rel=
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Themes x 235 ASP.NET themes are not
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Themes x 237 FIGURE 6-19 How It Wor
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Themes x 239 VB.NET Dim myCookie As
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Themes x 241 FIGURE 6-21 Within the
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Themes x 243 C# preferredTheme.Valu
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Skins x 245 a cookie called Preferr
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Skins x 247 3. In the Extension box
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Practical Tips on Creating Consiste
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Summary x 251 The imaginary CSS cla
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7Navigation WHAT YOU WILL LEARN IN
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Different Ways to Move Around Your
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Using the Navigation Controls x 257
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Programmatic Redirection x 277 Redi
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Programmatic Redirection x 279 How
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Practical Tips on Navigation x 281
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286 x CHAPTER 8 USER CONTROLS advan
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296 x CHAPTER 8 USER CONTROLS ASP.N
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308 x CHAPTER 8 USER CONTROLS This
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312 x CHAPTER 9 VALIDATING USER INP
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10 ASP.NET AJAX WHAT YOU WILL LEARN
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Using ASP.NET AJAX in Your Projects
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Using Web Services and Page Methods
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Practical Ajax Tips x 381 How It Wo
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386 x CHAPTER 11 JQUERY Fortunately
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388 x CHAPTER 11 JQUERY FIGURE 11-1
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490 x CHAPTER 13 DISPLAYING AND UPD
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14 LINQ and the ADO.NET Entity Fram
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Introducing LINQ x 499 surprise tha
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Mapping Your Data Model to an Objec
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Introducing Query Syntax x 507 and
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Introducing Query Syntax x 509 Wher
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Introducing Query Syntax x 511 Firs
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Introducing Query Syntax x 513 diff
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Introducing Query Syntax x 515 Orde
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Using Server Controls with LINQ Que
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Summary x 551 model. Combined with
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15 Working with Data — Advanced T
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Formatting Your Controls Using Styl
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Handling Events x 563 background-im
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Handling Events x 565 4. Make sure
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Handling Events x 567 The PreRender
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Handling Events x 569 Button1_Click
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Handling Events x 571 Select Case e
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Handling Events x 573 The RowDataBo
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Handling Events x 575 These classes
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Handling Events x 577 8. Save all y
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Hand-Coding Data Access Code x 579
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Caching x 589 In all the database e
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Caching x 591 Output Caching With o
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Caching x 593 Programmatic Caching
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Caching x 595 ‰ SummaryLabel ‰
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Caching x 597 } font-style: italic;
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Caching x 599 expiration date, whic
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Summary x 601 EXERCISES 1. Imagine
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16 Security in Your ASP.NET 4.5 Web
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Introducing the Login Controls x 60
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The Role Manager x 627 such as the
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The Role Manager x 629 1 . From wit
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The Role Manager x 631 FIGURE 16-19
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The Role Manager x 633 2. Save and
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The Role Manager x 635 Management s
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The Role Manager x 637 Alternativel
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The Role Manager x 639 } } case Lis
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Summary x 641 SUMMARY You can imple
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17 Personalizing Websites WHAT YOU
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Understanding Profile x 645 In the
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Understanding Profile x 647 You can
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Understanding Profile x 649 5. To t
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Understanding Profile x 651 To defi
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Understanding Profile x 653 press t
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Understanding Profile x 655 10. Dou
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Understanding Profile x 657 1. In M
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Understanding Profile x 659 e As Ev
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Understanding Profile x 661 That’
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Understanding Profile x 663 By clic
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Understanding Profile x 665 sent to
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Understanding Profile x 667 5. From
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Understanding Profile x 669 10. Ent
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Other Ways of Dealing with Profile
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Summary x 675 How It Works Much of
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680 x CHAPTER 18 EXCEPTION HANDLING
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790 x APPENDIX A EXERCISE ANSWERS }
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BConfiguring SQL Server 2012 So far
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Configuring SQL Server 2012 x 795 C
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Configuring SQL Server 2012 x 797 Y
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Configuring SQL Server 2012 x 801 I
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allowAnonymous attribute - ASP.NET
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Basic Settings mode - C# implementi
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ClientID property - complex events
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decimal data type - DynamicEnableDe
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input controls - handling input co
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Label control - logical operators L
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Microsoft Developer Network - New S
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Profile.GetProfile - ReadAllText me
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SQL statement - styling installing,
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text strings - types validation con
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validation controls- ViewState coll
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web services - Where clause flow of
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