Introducing Spring Framework

Chapter 9 ■ Adding Persistence to Your Spring Application
Listing 9-4 shows new elements used in JDBC, so let’s talk about them.
• You added a DataSource class. It provides all the necessary information to connect to a
database engine like username, password, driver, and URL.
• You added a Connection class. It establishes a connection to the database, in this case to the
HSQLDB engine.
• You added a Statement class. With this class you can create all SQL related calls (INSERT,
DELETE, UPDATE, SELECT).
• You added a ResultSet class. It will return the result of the executed query.
You can see that the DataSource is being injected, so you need to provide all the information about the database
you are going to use. Listing 9-5 shows the XML configuration that holds your bean definitions.
Listing 9-5. mydocuments-jdbc-context.xml
In Listing 9-5, you got rid of the whole bean definitions. Finally! The Spring Framework provides a manager
(DriverManagerDataSource class) for the DataSource that will be injected in the DocumentDAO implementation. Also,
you can see that you are using the namespace (as a property holder) to use a jdbc.properties file
(see Listing 9-6).
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