Beginning Microsoft SQL Server 2008 ... - S3 Tech Training

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Chapter 10: Views Editing Views in the Management Studio Modifying your view in the Management Studio is as easy as creating it was. The only real difference is that you need to navigate to your specific view and right-click it — then choose Modify, and you’ll be greeted with the same friendly query designer that we used with our query when it was created. Auditing: Displa ying Existing Code 316 What do you do when you have a view, but you’re not sure what it does? The first option should be easy at this point — just go into the Management Studio like you’re going to edit the view. Go to the Views sub-node, select the view you want to edit, right-click, and choose Modify View. You’ll see the code behind the view complete with color-coding. Unfortunately, we don’t always have the option of having the Management Studio around to hold our hand through this stuff (we may be using a lighter weight tool of some sort. The bright side is that we have two reliable ways of getting at the actual view definition: ❑ sp_helptext ❑ The sys.modules metadata function Using sp_helptext is highly preferable, as when new releases come out, it will automatically be updated for changes to the system tables. There is, arguably, a third option: directly accessing the syscomments system table. Microsoft has been warning for a couple of releases now about not using system tables directly. As of this writing, syscomments is still there, but the results that come out of it when you run a query have some bogus information in them. They may work fine for you, but, given that Microsoft has been recommending against using syscomments for a while now, it probably makes sense to move on to the more “approved” methods. Let’s run sp_helptext against one of the views we created in our AdventureWorks2008 database earlier in the chapter — YesterdaysOrders_vw: EXEC sp_helptext YesterdaysOrders_vw; SQL Server obliges us with the code for the view: Text ----------------------------------------------------------------------- CREATE VIEW YesterdaysOrders_vw AS SELECT sc.AccountNumber, soh.SalesOrderID, soh.OrderDate, sod.ProductID, pp.Name, sod.OrderQty, sod.UnitPrice, sod.UnitPriceDiscount * sod.UnitPrice * sod.OrderQty AS TotalDiscount, sod.LineTotal
FROM Sales.Customer AS sc INNER JOIN Sales.SalesOrderHeader AS soh ON sc.CustomerID = soh.CustomerID INNER JOIN Sales.SalesOrderDetail AS sod ON soh.SalesOrderID = sod.SalesOrderID INNER JOIN Production.Product AS pp ON sod.ProductID = pp.ProductID WHERE CAST(soh.OrderDate AS Date) = CAST(DATEADD(day,-1,GETDATE()) AS Date) Now let’s try it the other way — using the sys.sql_modules metadata function. The only major hassle with using this function is that all the objects are coded in object IDs. Object IDs are SQL Server’s internal way of keeping track of things. They are integer values rather than the names that you’re used to for your objects. In general, they are outside the scope of this book, but it is good to realize they are there, as you will find them used by scripts you may copy from other people or just bump into them later in your SQL endeavors. Fortunately, you can get around this by using the OBJECT_ID() function: SELECT * FROM sys.sql_modules WHERE object_id = OBJECT_ID(‘dbo.YesterdaysOrders_vw’); Again, you get the same block of code (indeed, all sp_helptext does is run what amounts to this same query). Note that, by default, the Results in Text option in the Query window limits the results from any individual column to just 256 characters, so running the previous sys.sql_modules query may get you a truncated version of the text for the view. If you look at it in grid mode, the limit is 64k, so everything comes through. You can change the maximum number of characters per column by going to Tools ➪ Options ➪ Query Results ➪ SQL Server ➪ Results to Text and changing the appropriate setting. Protecting Code: Encr ypting V iews If you’re building any kind of commercial software product, odds are that you’re interested in protecting your source code. Views are the first place we see the opportunity to do just that. All you have to do to encrypt your view is use the WITH ENCRYPTION option. This one has a couple of tricks to it if you’re used to the WITH CHECK OPTION clause: ❑ WITH ENCRYPTION goes after the name of the view, but before the AS keyword ❑ WITH ENCRYPTION does not use the OPTION keyword Chapter 10: Views 317
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Programmer to Programmer Get more
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Beginning Microsoft SQL Ser ver® 2
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Beginning Microsoft SQL Ser ver® 2
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About the Author Experiencing his f
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Acknowledgments Over the years, the
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Contents Chapter 2:T ools of the T
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Contents xviii The CREATE Statement
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Contents xx Correlated Subqueries 1
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Contents xxii SORT_IN_TEMPDB 280 ON
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Contents xxiv Control-of-Flow State
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Contents xxvi How the SQL Ser ver L
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Contents Chapter 16: A Brief XML Pr
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Contents Chapter 19: Pla ying Admin
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Introduction The beginning user wil
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Introduction ❏ We show file names
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Introduction xxxvi ❏ Understand t
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Chapter 1: RDBMS Basics: What Makes
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Chapter 2: Tools of the Trade 22 My
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Chapter 2: Tools of the Trade ❑ S
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Chapter 2: Tools of the Trade 26 Ke
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Chapter 2: Tools of the Trade 28 Th
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Chapter 2: Tools of the Trade 30 lo
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Chapter 2: Tools of the Trade 32 3.
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Chapter 2: Tools of the Trade 34 Fi
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Chapter 2: Tools of the Trade Figur
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Chapter 2: Tools of the Trade Note
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Chapter 2: Tools of the Trade bcp i
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3 The Foundation Statements of T-SQ
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asic SELECT statement. Fire up the
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Now let’s try taking a little bit
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very few of your tables will have s
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Operator Example Usage Effect ALL,
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Chapter 3: The Foundation Statement
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WHERE SalesOrderID IN (43660, 43670
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AVG This one is for computing avera
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efore, but remove the two AS keywor
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You’ll get a result that is a bit
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What if we want to place conditions
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Let’s say, for example, that we w
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City varchar(20) NOT NULL, State ch
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for it in the INSERT statement. For
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And sure enough, we get back the on
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Chapter 4: JOINs 82 returned is in
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Chapter 4: JOINs 84 Using an INNER
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Chapter 4: JOINs 86 Uh, oh — this
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Chapter 4: JOINs How It Works Unlik
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Chapter 4: JOINs If we were to look
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Chapter 4: JOINs 92 What I’m tryi
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Chapter 4: JOINs 16 Mountain-500 Si
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Chapter 4: JOINs 96 Let’s use thi
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Chapter 4: JOINs 98 vendor. We’re
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Chapter 4: JOINs 100 Somehow, we lo
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Chapter 4: JOINs Try It Out FULL JO
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Chapter 4: JOINs Every time I teach
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Chapter 4: JOINs JOIN Sales.Special
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Chapter 4: JOINs Figure 4-1 As alwa
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Chapter 4: JOINs 110 CREATE TABLE U
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Chapter 4: JOINs There are two diff
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Chapter 5: Creating and Altering Ta
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Chapter 6: Constraints At a more sp
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Chapter 6: Constraints We can then
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Chapter 6: Constraints A table can
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Chapter 6: Constraints FOREIGN KEY
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Chapter 6: Constraints How It Works
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Chapter 6: Constraints Cascading Ac
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Chapter 6: Constraints 166 This is
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Chapter 6: Constraints 168 FROM Ord
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Chapter 6: Constraints 170 Let’s
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Chapter 6: Constraints CHECK Constr
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Chapter 6: Constraints Defining a D
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Chapter 6: Constraints Ignoring Bad
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Chapter 6: Constraints Try running
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Chapter 6: Constraints Rules and De
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Chapter 6: Constraints Dropping Rul
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Chapter 6: Constraints 184 Restrict
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7 Adding More to Our Queries When I
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Building a Nested Subquery A nested
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While this works just fine, queries
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We’ll go back to the AdventureWor
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❑ Aliases are used in both querie
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Now let’s see this at work in our
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So let’s take this now and apply
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This join-based syntax, for example
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IF NOT EXISTS (SELECT ‘True’ FR
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The conversions can actually get a
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there are no other roll up records
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GROUP BY soh.OrderDate, sod.Product
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OUTPUT $action, inserted.Year, inse
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The long-standing, traditional view
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8 Being Normal: Normalization and O
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Chapter 8: Being Normal: Normalizat
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9 SQL Ser ver Storage and Index Str
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Page Splits When a page becomes ful
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Page 309 and 310: Navigating the Tree Figure 9-4 As I
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Chapter 12: Stored Procedures Creat
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Chapter 12: Stored Procedures Dropp
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Chapter 12: Stored Procedures Suppl
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Chapter 12: Stored Procedures Confi
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Chapter 12: Stored Procedures Now,
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Chapter 12: Stored Procedures SQL S
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Chapter 12: Stored Procedures Sproc
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Chapter 12: Stored Procedures When
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Chapter 12: Stored Procedures 400 @
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Chapter 12: Stored Procedures I’d
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Chapter 12: Stored Procedures There
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13 User-Defined Functions Well, her
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types!), except for BLOBs, cursors,
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We get back the same set as with th
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AS RETURN (SELECT BusinessEntityID,
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in your relational database. These
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AS BEGIN ( EmployeeID int NOT NULL,
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So, as you can see, we can actually
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Despite being schema-bound, this on
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14 Transactions and Locks This is o
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we are unable or do not want to com
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Figure 14-1 Data needed Data in cac
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Transaction 4 This transaction wasn
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Oops — problem!!! Transaction 2 h
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The only cure for this is setting y
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Exclusive Locks Exclusive locks are
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Also: ❑ The Sch-S is compatible w
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The syntax for switching between th
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As with most things in life, howeve
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purchased. Process 2 records sales;
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Chapter 14: Transactions and Locks
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Chapter 15: Triggers the world’s
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Chapter 15: Triggers WITH ENCRYPTIO
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Chapter 15: Triggers FOR|AFTER The
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Chapter 15: Triggers 458 To illustr
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Chapter 15: Triggers 460 IF EXISTS
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Chapter 15: Triggers ❑ Feeding de
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Chapter 15: Triggers Trigger Firing
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Chapter 15: Triggers Like regular t
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Chapter 15: Triggers The COLUMNS_UP
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Chapter 15: Triggers This is the sa
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Chapter 15: Triggers 472 we have th
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Chapter 16: A Brief XML Primer So,
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Chapter 16: A Brief XML Primer Figu
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Chapter 16: A Brief XML Primer Elem
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Chapter 16: A Brief XML Primer ❑
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Chapter 16: A Brief XML Primer 482
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Chapter 16: A Brief XML Primer Name
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Chapter 16: A Brief XML Primer The
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Chapter 16: A Brief XML Primer 2. W
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Chapter 16: A Brief XML Primer SQL
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Chapter 16: A Brief XML Primer So,
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Chapter 16: A Brief XML Primer If,
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Chapter 16: A Brief XML Primer Note
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Chapter 16: A Brief XML Primer RAW
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Chapter 16: A Brief XML Primer AUTO
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Chapter 16: A Brief XML Primer EXPL
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Chapter 17: Reporting for Duty, Sir
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19 Playing Administrator And so, he
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❑ Write the information to the ev
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Creating Jobs and Tasks Using Manag
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Let’s go ahead and move on to the
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Figure 19-8 Figure 19-9 Chapter 19:
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Figure 19-11 Figure 19-12 Chapter 1
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Backup and Reco very No database-dr
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❑ Differential: This might be ref
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❑ Simple: Under this model, the t
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The older DBCC commands are still s
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many rows inserted over time and th
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Chapter 19: Playing Administrator T
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Appendix A: System Functions In add
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Appendix A: System Functions @@TOTA
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Appendix A: System Functions CHECKS
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Appendix A: System Functions SUM Th
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Appendix A: System Functions The de
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Appendix A: System Functions @@REMS
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Appendix A: System Functions Cert_I
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Appendix A: System Functions Encryp
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Appendix A: System Functions @@FETC
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Appendix A: System Functions CURREN
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Appendix A: System Functions SYSDAT
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Appendix A: System Functions GetRoo
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Appendix A: System Functions The ex
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Appendix A: System Functions RAND T
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Appendix A: System Functions ❑ IN
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Appendix A: System Functions ❑ Is
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Appendix A: System Functions FILEGR
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Appendix A: System Functions INDEX_
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IsCheckCnst IsConstraint IsDefault
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Appendix A: System Functions OBJECT
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Appendix A: System Functions The qu
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Appendix A: System Functions The SU
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Appendix A: System Functions ASCII
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Appendix A: System Functions The ch
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Appendix A: System Functions UNICOD
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Appendix A: System Functions NULLIF
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Appendix A: System Functions Text a
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ABS function A ABS function, 611 AC
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closing tags closing tags, XML docu
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cryptographic functions (continued)
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defects defects. See well formed XM
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EXPLICIT option EXPLICIT option bas
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IGNORE_DUP_KEY option (CREATE INDEX
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LOWER function LOWER function, 635
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online transaction-processing (OLTP
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query results query results alphabe
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scripts (continued) creating with M
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state state, basics of, 391 stateme
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transactions (continued) COMMIT TRA
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View Builder View Builder (Manageme
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