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The next step is to create an instance of the connection class First, declare a variable that references the instance, and second, create the instance and assign it to the variable as shown here:
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Dim conMyDb As SqlConnection conMyDb = New ~ql~onnection(~Server=localhost;uid=myID;pwd=m~assword; database=mydatabaseM)
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We need to create an instance of the SqlConnection class and pass the constructor of the SqlComection class information it needs to link to the DBMS The constructor creates the instance of a class There are three pieces of information that you must provide The first is the location of the server that contains the DBMS This is the URL of the server or localhost if the DBMS resides on your computer For this example, we're assuming that you have the database on your local computer The next two pieces of information are needed to log onto the DBMS These are user ID (uid) and the password (pwd) These are assigned by directly interacting with the DBMS In a business environment, the database administrator is the person who assigns logon information to everyone The last piece of information is the name of the database You'll remember from 2 that the DBMS maintains many databases, each having its own unique name You must identify the database that you want to link to by assigning the database name to the database parameter when you create an instance of the SqlConnection class The SqlConnection constructor returns a reference to the instance to the variable You then use the variable to access functions and attributes of the class One of the first of these is called the Open() function, which opens the database connection as shown here:
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conMyDb Open ( )
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Now let's put these statements together to create an ASPNET web page that accesses the customer database We'll show two examples The first is for Microsoft SQL Server, and the second is for Microsoft Access Notice that the connection to the database is made in the Page-Load subroutine Each time the page is loaded, the ASPNET engine establishes a connection with the database
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Import Namespace="SystemDataSqlClient~ % > <Script Runat="Servern> Sub Page-Load Dim custDb As SqlConnection custDb = New SqlConnection(~Server=localhost;uid=myID;pwd=m~assword; database=customeru) custDb Open ( ) End Sub </Script>
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CHAPTER 10 Interacting with Databases
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Here is the example for linking to Microsoft Access You'll notice a few differences between this example and the preceding example The first is that we're importing the SysternDataOleDb namespace, which enables us to use the OleDb classes that are needed to interact with Microsoft Access Another difference is in the OleDbConnection constructor Notice that there are two parameters The first is Provider, which is the name of the DBMS OleDB is the provider of MicrosoftJetOLEDB40, which Microsoft Access is associated with The second parameter is Datasource, which is the location and name of the database In this example the database is located on the C: drive and is called custmdb The other parts of the example are identical to the preceding example
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<%@ Import Name~pace=~SysternDataOleDb~> % <Script Runat="ServerM> Sub Page-Load ( S As Object, e As EventArgs ) Dim custDb as OleDbConnection custDb = New OleDbConnection(~Provider=MicrosoftJetJetOLEDB4O;DataSource=c:custm&' ) custDb Open ( End Sub </Script>
Creating a Database and Tables
Before continuing, it is important to create a database and at least one table in order to work through examples in this chapter You should install a DBMS (see 9) It is beyond the scope of this book to explain how to install a DBMS Most DBMSs have a user interface that you can use to create a database and tables In the next chapter we'll show you how to create these using a query from within your application For now, you'll need to create a database You can call it MyBusiness And then create the following table and call it custContact Here are the column definitions:
Insert these rows so that you'll be able to retrieve them when you send a query to the DBMS in examples throughout this chapter
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