BUILDING A VIEW in Visual C#

Create ECC200 in Visual C# BUILDING A VIEW

CHAPTER 9 BUILDING A VIEW
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more processing by SQL Server, causing a slowdown in performance. Temper this perceived gain of using an index with the downside of the extra processing required to keep the data up to date in two places for the table and two places for the index for those columns involved in the view. Now that you are aware of the pros and cons of building indexes on views, and how they differ from indexes for tables, it is time to build an index on our view. The aim of this index is to locate a record in the view quickly. We want to be able to find all the products for a customer based on his or her account number. Notice that we are not using CustomerId here. First of all, that column is not within the view, so it is unavailable for selection anyway, but we have to cater to when a customer phones up and supplies the account number. This customer will be unaware of his or her ApressFinancial internal CustomerId. Building the index is very quick and very simple, especially since you already know the basics from building indexes earlier in the book.
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Try It Out: Indexing a View
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1. The view we want to index is vw_CustFinProducts, as we know that was created with SCHEMABINDING. The unique clustered index will be on the AccountNumber, as we know that this will be unique. In a Query Editor query pane, enter the following code: CREATE UNIQUE CLUSTERED INDEX ix_CustFinProds ON CustomerDetails.vw_CustFinProducts (AccountNumber,ProductName) 2. Execute this code. When you do, you might get an error. The error I received was as follows Msg 1935, Level 16, State 1, Line 1 Cannot create index. Object 'vw_CustFinProducts' was created with the following SET options off: 'ANSI_NULLS, QUOTED_IDENTIFIER'. 3. As was mentioned when discussing the options required to index a view, we didn t have these two options set to on. We therefore have to re-create the view. From the Object Explorer, right-click and select Script View As CREATE To New Query Editor Window, as you see in Figure 9-27.
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Figure 9-27. Scripting the view 4. This brings up the code in a new Query Editor pane. Modify the two SET options and add in a DROP VIEW statement so that we can re-create the view. Executing the code should be successful.
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CHAPTER 9 BUILDING A VIEW
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USE [ApressFinancial] GO /****** Object: View [CustomerDetails].[vw_CustFinProducts] Script Date: 08/07/2005 12:31:54 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO DROP VIEW CustomerDetails.vw_CustFinProducts GO CREATE VIEW [CustomerDetails].[vw_CustFinProducts] WITH SCHEMABINDING AS SELECT c.CustomerFirstName + ' ' + c.CustomerLastName AS CustomerName, c.AccountNumber, fp.ProductName, cp.AmountToCollect, cp.Frequency, cp.LastCollected FROM CustomerDetails.Customers c JOIN CustomerDetails.CustomerProducts cp ON cp.CustomerId = c.CustomerId JOIN CustomerDetails.FinancialProducts fp ON fp.ProductId = cp.FinancialProductId GO SET ANSI_NULLS OFF GO SET QUOTED_IDENTIFIER OFF 5. We can then move back to our pane with the CREATE INDEX statement. Executing that code should be successful now as well. The index on a view has now been successfully created. As you can see, there are a number of restrictions, but not to the point that no index can exist. You just have to think about what you are doing, and if you have a query in your view that contains an item from the preceding list and you wish to create an index, you just have to find a way around it.
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This chapter will have given you the confidence, when building your own view, of knowing which options and features of views you wish to use. We have covered what a view is, how views can improve a database s security, how to encrypt your view, building a view using the SQL Server Management Studio and a Query Editor pane, how to join two tables within a view, and indexing a view. Creating a view when there is more than one table to retrieve data from on a regular basis is quite often a sensible solution, even more so when you wish to use views as a method of simplifying the database schema and abstracting the database data into a presentation layer for users. Encrypting views may seem like a good idea to hide even further the schema of your database from potential users; however, do use encrypted views with caution, and always keep a
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