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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. vb.net qr code reader NET QR Code Barcode Reader - KeepAutomation.com
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NET developers solve this problem, RasterEdge designs this powerful and multi- functional barcode reading and scanning SDK. Using this VB . NET QR Code ... After you create a class that implements Runnable, you will instantiate an object of type Thread from within that class Thread defines several constructors The one that we will use is shown here: Thread(Runnable threadOb, String threadName) In this constructor, threadOb is an instance of a class that implements the Runnable interface This defines where execution of the thread will begin The name of the new thread is specified by threadName After the new thread is created, it will not start running until you call its start( ) method, which is declared within Thread In essence, start( ) executes a call to run( ) The start( ) method is shown here: void start( ) Here is an example that creates a new thread and starts it running: vb.net qr code reader free ByteScout Barcode Reader SDK - VB . NET - Decode QR Code ...
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NET developers solve this problem, RasterEdge designs this powerful and multi- functional barcode reading and scanning SDK. Using this VB . NET QR Code ... // Create a second thread class NewThread implements Runnable { Thread t; NewThread() { // Create a new, second thread t = new Thread(this, "Demo Thread"); Systemoutprintln("Child thread: " + t); tstart(); // Start the thread } // This is the entry point for the second thread public void run() { try { for(int i = 5; i > 0; i--) { Systemoutprintln("Child Thread: " + i); Threadsleep(500); } } catch (InterruptedException e) { Systemoutprintln("Child interrupted"); } Systemoutprintln("Exiting child thread"); } } class ThreadDemo { public static void main(String args[]) { new NewThread(); // create a new thread try { for(int i = 5; i > 0; i--) { Systemoutprintln("Main Thread: " + i); Threadsleep(1000); } } catch (InterruptedException e) { 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 Dreamweaver provides reports to help you locate errors Validation reports ensure your site meets the W3C standards The Link Checker report displays information about internal and external links and orphaned files Use the Target Browser Check to check your site against different browsers Part I: Systemoutprintln("Main thread interrupted"); } Systemoutprintln("Main thread exiting"); } } 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); } 1 Define report, Validation report, Link Checker report, orphaned file, Target Browser Check 2 Explain how reports can help you maintain a more efficient and effective Web site Inside NewThread s constructor, a new Thread object is created by the following statement: t = new Thread(this, "Demo Thread"); 3 Draw Conclusions Why should you do a Target Browser Check 4 Compare and Contrast How are a Target Browser Check and a Link Checker report similar and different from each other 11: vb.net qr code reader free VB . NET QR Code Reader SDK to read, scan QR Code ... - OnBarcode
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