data matrix code c# BUILDING A VIEW in Visual C#

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CHAPTER 9 BUILDING A VIEW
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Note Even with WITH CHECK OPTION defined, if the data is modified directly in the table, it won t be
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verified against any views defined with the underlying tables. Also, if the view uses TOP, then WITH CHECK OPTION cannot be defined.
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The final possible option, VIEW_METADATA, exposes the view s metadata if you are calling the view via ODBC, OLE DB, etc. in other words, from a program that is external to SQL Server. Now that you are aware of the basic syntax for creating a view, the next example will take this knowledge and build a new view for the database.
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Creating a View: A Query Editor pane
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Another method for creating views is by using T-SQL code in a Query Editor pane, in my experience the fastest and best option. This can be a faster method for building views than using SQL Server Management Studio, especially as you become more experienced with T-SQL commands. This section will demonstrate the T-SQL syntax required to create a view, which you will soon see is very straightforward. The SELECT statement forms the basis for most views, so this is where most of the emphasis is placed when developing a view. By getting the SELECT statement correct and retrieving the required data, it can then be easily transformed into a view. This is how the view in the following example is created, so let s look at building a view using T-SQL and a Query Editor pane. In the following example, we will create a view that returns a list of transactions for each customer with some customer information.
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Try It Out: Creating a View in a Query Editor pane
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1. Ensure that SQL Server a Query Editor pane is running and that there is an empty Query Editor pane. First of all, let s get the T-SQL correct. We need to link in three tables, the CustomerDetails.Customers table to get the name and address, the TransactionDetails.Transactions table so we can get a list of transactions for the customer, and finally the TransactionDetails.TransactionTypes table so that each transaction type has its full description. The code is as follows: SELECT c.AccountNumber,c.CustomerFirstName,c.CustomerOtherInitials, tt.TransactionDescription,t.DateEntered,t.Amount,t.ReferenceDetails FROM CustomerDetails.Customers c JOIN TransactionDetails.Transactions t ON t.CustomerId = c.CustomerId JOIN TransactionDetails.TransactionTypes tt ON tt.TransactionTypeId = t.TransactionType ORDER BY c.AccountNumber ASC, t.DateEntered DESC 2. Once done, execute the code by pressing F5 or Ctrl+E, or clicking the execute button.
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CHAPTER 9 BUILDING A VIEW
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3. We can now wrap the CREATE VIEW statement around our code. Execute this code to store the view in the ApressFinancial database. As there is an ORDER BY clause, we need to add to the query a TOP statement, so we have TOP 100 Percent. CREATE VIEW CustomerDetails.vw_CustTrans AS SELECT TOP 100 PERCENT c.AccountNumber,c.CustomerFirstName,c.CustomerOtherInitials, tt.TransactionDescription,t.DateEntered,t.Amount,t.ReferenceDetails FROM CustomerDetails.Customers c JOIN TransactionDetails.Transactions t ON t.CustomerId = c.CustomerId JOIN TransactionDetails.TransactionTypes tt ON tt.TransactionTypeId = t.TransactionType ORDER BY c.AccountNumber ASC, t.DateEntered DESC This view is a straightforward view with no ENCRYPTION or SCHEMABINDING options. The one complication within the view concerns the ORDER BY clause: one of the stipulations for this view is that it returns the data of financial transactions with the most recent transaction first. Therefore, an ORDER BY statement is required on the DateEntered column to return the records in descending order. To avoid receiving an error message when building the view, it has been necessary to place a TOP option within the SELECT statement; in the case of the example, a TOP 100 PERCENT statement has been chosen so that all the records are returned. The remainder of the SELECT statement syntax is very straightforward.
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Creating a View: SCHEMABINDING
The following example will bind the columns used in the view to the actual tables that lie behind the view, so that if any column contained within the view is modified, an error message will be displayed and the changes will be canceled. The error received will be shown so that we can see for ourselves what happens. First of all, let s build the view before going on to discuss the background. This view is going to list products for customers, therefore linking the Customers.CustomerProducts, and CustomerDetails.FinancialProducts tables.
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