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<P> <asp:Button Text="Delete Customer" OnCli~k=~Button-Clickn Runat="ServerM / > <P>
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Import Namespace="SystemDataM% > Import Namespa~e=~SystemDataOleDb % > <Script R~nat=~Server"> Sub Button-Click( S As Object, e As EventArgs ) Dim custDb As OleDbConnection Dim cmdDeleteCustomers As OleDbCommand custDb = New OleDbConnection( 11PROVIDER=MicrosoftJet0LEDB40;Data Source=c: cust mdbu) cmdDeleteCustomers = New OleDbCommand("1nsert custcontact SET custFirstName = txtCustFirstNameText Where custNumber = @CustNumberu, custDb) cmdDeleteCustomersParametersAddWithVa~ue( wOCustNumber",txtCustNumberText 1 custDb Open( cmdDeleteCustomersExecuteNonQuery~) custDbClose ( ) End Sub </Script> <html> <head>ctitle>New Customer</title></head>
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Throughout this chapter you learned how to create simple queries to perform operations that are common to commercial web sites These queries are created in the event handler in your web page and are sent to the DBMS for processing Commercial web sites typically use complex queries that perform multiple operations such as updating two or more tables whenever a new customer is added to the database
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Complex queries can become rather long, and sending them from the web page to the DBMS is time-consuming Although the time it takes to send the query from the web page to the DBMS might seem fast to us, it can actually slow down processing if you consider that a commercial web site might need to process many requests each second A common way to increase speed is by using a stored procedure A stored procedure is a query that resides in the DBMS and can be called from your web page Think of a stored procedure as a function or procedure (see 7) that is stored in the DBMS
Creating a Stored Procedure
A stored procedure is defined in a query using the Create Procedure statement You can enter the query directly into an interactive software tool provided by the DBMS such as the Microsoft SQL Server Enterprise Manager or Query Analyzer Alternatively, you can execute the query from your application by using the ExecuteNonQuery() function, which is illustrated in examples throughout this chapter It is important to understand that not all DBMSs support stored procedures, and therefore, you'll need to check with the DBMS manufacturer before incorporating stored procedures in your application The Create Procedure statement requires a unique name, SQL statements that are to execute when the stored procedure is called, and a return value if required by your application You'll find that some stored procedures, such as those used to insert a new row into the database, don't require a return value, while others, such as procedures for counting the number of customers, do require one Let's take a look at a simple stored procedure that will count the number of customers there are in the custcontact table We'll call this HowManyCustomers:
Create Procedure HowManyCustomers As Dim intNumCustomers As Integer intNumCustomers = Select Count ( * ) From custcontact Return (iIntNumCustomers)
Statements below the As keyword form the query that you would otherwise run from your application In this example, we declared a variable called intNumCustomers, which then receives the results from the query The Select statement in the query uses the SQL Count() function, which you'll learn more about in the next chapter An asterisk is placed within the parentheses This is a wildcard character that tells the DMBS to use any column to count the number of rows in the table As you'll see in the next chapter, you can replace the
CHAPTER 10 Interacting with Databases
asterisk with a column name As you'll remember from other examples, the From clause specifies the name of the table Return is used to specify the value that is returned to the SQL statement in the web page that called the stored procedure
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