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Making It Real 89 tor/J driver will be located and pulled into the application. Once the object has been created, a windowClosing event is attached to exit the application when the user clicks the window s close button. Two methods are called on the object. The first is init(), which builds a connection to the database, and the second is buildGUI(), which handles the construction of the GUI presentation. Figure 5.3 Our GUI when first executed. The init() Method The init() method is quite simple: It creates a Connection object and attempts to communicate with the MySQL database server. If a connection is successful, an object variable is instantiated to hold the Connection. A try/catch block is used to grab any errors in the connection attempt and to exit the application appropriately. The buildGUI() Method The vast majority of the work for the application occurs in the buildGUI() method. In Figure 5.3 you see that we have several GUI components to build and place on the GUI frame. The most important is the list in the upper-left corner, which holds all of the account numbers from our acc_acc table on the MySQL database. A user will click one of these account numbers and click on the Get Account button to pull all of the information for the one account and display it in the text boxes on the screen. Our goal in this discussion isn t to provide details on the use of Java GUI components but to describe how those components interact with Connector/J to pull information from the database. Building a JList with Account Numbers Our GUI will contain a JList component, a JButton, and five JTextFields. First, we create the JList with all of the account numbers currently in the acc_acc database table. A JList requires a Model; to populate it we ve chosen to use a vector. In the buildGUI() method, the code begins by instantiating a new Vector object. A try/catch block is entered, and SQL code executes a SELECT of just the acc_id column from the acc_acc table. Next, a loop is used to pull each of
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