Getting Startedwith pureQuery

Chapter 10 – Inline Programming Style 187
application. Most of the “In practice” sections ask you to add a line or two of pureQuery
code to either the class or the interface. Look for the comments that say TODO: Add
pureQuery code here. to know where to add the code.
10.2.2 In practice: Create a Data object in the displayLogin() method
The Human Resources Manager application creates a single instance of Data in the
displayLogin() method and passes that instance to other methods, as required.
Finally, before the application exits, it closes the instance of Data. Modify the
displayLogin() method so that it creates and closes an instance of Data.
10.2.2.1 Add code to the displayLogin() method to create the Data object
Since we are using the inline programming style, we need a getData method that does
not take a Class interfaceClass parameter. We will be using a database, and we
want pureQuery to create a connection by using the DataSource object that is in
hrm.HRMDataSourceFactory, so we need a method that has a
javax.sql.DataSource parameter. We choose the method shown in Listing 10.2.
DataFactory.getData (DataSource ds)
Listing 10.2 - The getData method that we will use to create an instance of Data
The displayLogin() method contains a declaration for a variable named data. Add
code that creates an instance of Data and assigns the result to data. Look for a comment
that says TODO: Add pureQuery code here. to know where you need to add the new
code. Listing 10.3 shows the updated version of the code.
// Get the DataSource, and use it to create an instance of Data.
DataSource dataSource = HRMDataSourceFactory.getDataSourceForApplication
();
data = DataFactory.getData (dataSource);
Listing 10.3 - Add code to the displayLogin() method that creates an instance of
Data
10.2.2.2 Close the Data object when your application no longer needs it
Modify the finally block in displayLogin() to close the instance of Data. This
closes the java.sql.Connection object that pureQuery created for the instance of
Data. Listing 10.4 shows the code that you need to add.
// Close the instance of Data. This closes the
// database connection that it contains.
if (null != data) {
data.close ();
}
Listing 10.4 - Add code to the displayLogin() method that closes the instance of
Data