Getting Started with WebSphere Application Server

Chapter 4 – Working with databases 79
2. An editor showing the new JSP file appears as shown in Figure 4.18. Change the title
text to DBDemo.
Figure 4.18 – The generated JSP file
3. In the JSP file, follow these steps to access the data in the database:
a) Import some necessary database access java classes as shown in Listing 4.2.
Listing 4.2 – Import the necessary java classes for database access
b) Initialize a naming context to look up a data source as shown in Listing 4.3. In the
lookup string, java:comp/env/ is the common prefix of the naming space,
jdbc/DataSource is the logical name of the defined data source.
Context initContext = new InitialContext();
DataSource ds =
(DataSource)initContext.lookup("java:comp/env/jdbc/DataSource");
Listing 4.3 - Initializing a naming context and looking up a datasource
c) Open the Web project descriptor file WEB-INF/web.xml, define the logical name
as shown in Listing 4.4.
jdbc/DataSource
javax.sql.DataSource
Container
Shareable
Listing 4.4 - The logical name defined in web.xml
Then open WEB-INF/geronimo-web.xml, add some configurations to map the
logical name to the physical name jdbc/demods as shown in Listing 4.5. The