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The Model A program, shown in Listing 11-1, is designed to execute queries that do not return a ResultSet It is organized into the ModelA() constructor and the main() The main() creates an instance of the ModelA object called sql1, which causes the execution of the constructor The constructor begins by creating three String objects These are url, userId, and password The url is assigned the URL of the database In this example, the JDBC/ODBC bridge is used to connect to the CustomerInformation database Of course, the URL used in your J2ME application replaces the URL in Model A and will represent the JDBC driver and database that are specific to your J2ME component Likewise, the database used with your J2ME application may or may not require a user ID and password If these are required, they will undoubtedly be different from the user ID and password used in Model A The first try {} block in Model A uses the ClassforName() method to load the JDBC driver into the Java Virtual Machine (JVM) You will probably need to replace the driver used in Model A with the appropriate JDBC driver for your J2ME component Once the JDBC driver is loaded, the getConnection() method is called to open a connection to the database using the url, userID, and password String objects The getConnection() method returns a Connection object called database, which is declared above the definition of the constructor Two catch {} blocks follow the first try {} block and are used to trap exceptions that occur while the driver is loaded and a connection is established with the database You can change the text of messages shown in Model A that are displayed when an exception is caught to a message that is more conducive to your programming style and J2ME requirements The second try {} block in Model A contains a comment You should replace this try {} block with the try {} that appears in the section of this chapter that describes the task you want performed by the J2ME component You ll notice as you read through this chapter that the try {} block within each section references a Statement object called DataRequest, which is declared as a private member of the ModelA class The second try {} block is followed by a catch {} block that traps SQL exceptions that occur during the execution of the query in the second try {} block.

E XPERT GROUP I NSIGHT Of all the elements of JavaServer Faces that the Expert Group debated,

(const T, P )

the request processing lifecycle was the one that had the most input from the widest range of members and evolved the most over the development of the specification For example, initially, the view description was required to be in a separate XML file, in addition to the JSP page This requirement was lifted with the invention of the ViewHandler class, which came about during discussions of the lifecycle

Anytime a database connection is closed, you should first check for a null value on the Connection object If the connection is no longer valid, the close() method will throw a NullPointerException

This requirement has a number of consequencesEquation (1230),rearranged and written for a binary system, becomes:

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In short, the request processing lifecycle performs all of the necessary back-end processing for which one would otherwise have to write his or her own code The lifecycle directs the processing of incoming request parameters, and it manages a server-side set of UI components and synchronizes them to what the user sees in a client browser It also satisfies follow-up requests for images, style sheets, scripts, and other kinds of resources required to complete the rendering of the UI

Listing 11-1 A model J2ME application that doesn t retrieve information from a database (Model A) import javasql*; public class ModelA { private Connection Database; private Statement DataRequest; public ModelA () { String url = "jdbc:odbc:CustomerInformation"; String userID = "jim"; String password = "keogh"; try { ClassforName( "sunjdbcodbcJdbcOdbcDriver"); Database = DriverManagergetConnection(url,userID,password); } catch (ClassNotFoundException error) { Systemerrprintln("Unable to load the JDBC/ODBC bridge" + error); Systemexit(1); } catch (SQLException error) { Systemerrprintln("Cannot connect to the database "+ error); if(Database != null) { try { Databaseclose(); } catch(SQLException er){} } Systemexit(2); } try { // insert example code here } catch ( SQLException error ) { Systemerrprintln("SQL error" + error); if(Database != null) { try { Databaseclose(); } catch(SQLException er){} } Systemexit(3); }

Figure 1411 Gibbs-energy change of mixing Curve I, complete miscibility; curve II, two phases between a, and , 6

In contrast to other more traditional Web technologies, ranging from CGI and Java servlets to frameworks like Struts, the request processing lifecycle performs a majority of the common server-side Web development tasks automatically in a well-defined, event-based way With frameworks such as Struts, where some of the request processing is more formalized in code with Form Beans and Struts Actions, the actual processing of the data is still done at a lower level compared to JSF The Struts programming model provides less of an abstraction

3:

and Hence, equivalent to Eq (1465), stability requires:

11:

from the servlet API than that provided by JSF For example, in Struts, you can define a Form Bean that represents the properties of your submitted form:

Further, for a binary mixture Eq (126) is:

if(Database != null) { try { Databaseclose(); } catch(SQLException er){} } } public static void main ( String args [] ) { final ModelA sql1 = new ModelA (); Systemexit ( 0 ) ; } }

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