Go! Building a Web Page with a Back-end DB2 Data Server Using Visual Studio
If you have a valid DB2 database connection, you can quickly
build your first ASP.NET Web site that accesses a DB2 data server. In this
section, I will outline how to build a quick Web page based on ASP.NET that quickly
binds all of the rows in the EMPLOYEE table (which resides in the SAMPLE
To build this Web site, perform the following steps:
a new ASP.NET application called QuickDB2WebSite by selecting File-->New Web Site-->ASP.NET Web Site, and clicking OK,
as shown below:
that you're working in the Visual Studio Web Designer mode by right-clicking
the Default.aspx object in your Solution Explorer and selecting the View
Note: If you cannot
see the Solution Explorer, press Ctrl+Alt+L, or select View-->Solution Explorer from the menu bar.
the Default.aspx object in the Solution Explorer, right-click, select Rename,
and type DB2EMPLOYEEWebSite.aspx for
the name of this Web page.
Ctrl+Alt+X to open the Toolbox (or select View-->Solution Toolbox from the menu bar) and
ensure that only the Data section is expanded. At this point, Visual
Studio 2005 should now look similar to this:
a SqlDataSource object from the Toolbox to your designer palette. This
operation adds the SqlDataSource object to your designer palette, at
which point you can configure the object to connect to a DB2 data server, as
Configure Data Source. The Configure Data Source Window opens.
you have an existing connection to a DB2 database in the Server Explorer, click
the Which data connection should your application use to connect to the
database? drop-down list, select the database connection that represents
the SAMPLE database, and click Next.
If you don't have a database
connection, click New Connection and refer to the Addendum: Adding a
DB2 Data Source to the Visual Studio 2005 Server Explorer section at the end
of this article.
Save the Connection String to the Application Configuration File window opens. Accept
the default values for this example. Click Next.
Configure the Select Statement window opens. Select the Specify columns from
a table or view radio button and select the <your_schema>.EMPLOYEE
table in the Name drop-down list, as shown below:
10. Select the * check
box in the Columns window.
You can restrict columns from being
populated in the data grid that you will bind to your Web page by individually not
selecting each of the columns. The * operator has the effect of
selecting all of the columns in the table, as you can see in the SELECT
statement window. This window is refreshed based on the selections you make
in the Columns window (as well as options available on this page more
on this in a bit).
Note: Don't make any
of the changes shown in the remainder of this step; the information here is for
illustrative purposes only. Of course, feel free to go back and experiment with
these options after completing the steps in this article. Try rebuilding the
same Web page using different options to get a good feel for how they work.
The Configure the Select Statement
window has a lot of features and capabilities. For example, you can use an
existing stored procedure to populate the data grid or build a query to
restrict rows in that data grid, which ultimately gets displayed on your Web
page. To perform either of the manual operations, select the Specify a
custom SQL statement or stored procedure radio button. An example of defining
a custom SQL statement is shown below:
You can see in this figure that you
can manually build SELECT, UPDATE, INSERT,
and DELETE statements for your Web page
(something we'll have Visual Studio 2005 do automatically for us in a moment).
You can even leverage encapsulated business logic in your DB2 stored procedures
(which can be written in Java or .NET CLR code, as well as the SQL/PL and other
languages). Also note in the previous figure the integration of the Microsoft
Query Builder into this tool, which can also be used to manually generate
queries to fill your Web site's data grid.
You can also use the WHERE,
ORDER BY, and Advanced buttons to specify additional options that
will apply to the generated query that will be used to populate your Web page's
The WHERE and ORDER BY buttons
allow you to specify restriction predicates on the query, as well as an
ordering mechanism. For example, if you wanted to order the data in your Web
Page by an employee's Job type in descending alphabetical order (Z-->A, a favorite order of mine), for all the
male employees, you could use these buttons, as shown below:
If you use any of these options,
the SQL generated for your Web page will be automatically updated, as shown at
the bottom of the previous figure.
Note: We'll turn our
attention to the Advanced button on this window in the next step.
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