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The init method will be called whenever the servlet is loaded that is, when the application server is started Because our servlet accesses the database, we need to create a connection to the database Given the fact that creating a connection takes time (it is actually one of the operations that consumes the longest amount of time to perform), it makes sense that we open the connection during servlet startup (when no users are waiting on this operation) We also do other things that need to happen only once, such as reading the property files and setting all constants to be used later in the actual processing Note that the database connection is performed through a simplistic connection class, which is shown next Normally, when using WebSphere, you use a connection retrieved from a connection pool, as opposed to having the servlet manage the connections This functionality is covered at length in 18

Part III:

conditioning interpreting the information received from the sensors, translating analog data to digital form (A/D conversion), and doing the reverse (D/ A conversion) for outgoing commands Digital information, both incoming and outgoing, requires interpretation but not conversion The IFID does not replace any of the local loop control devices Each device connected to the IFID is called a point In present technology, the IFID has been superceded by the DDC

4 Click OK The default name of the variable is String 1To change the default to a more descriptive name, in the Properties pane, click in the Name property, and specify a new name In this example, we use Evaluate Gross Profit Margin % The name in the Variables work area is changed, as shown next:

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package bookwebspherechapter22; import javasql*; public class DBConnection { static Connection conn = null; static String aURL; static String aUserName; static String aPassword; 377

5 In the work area, under the Values box, click Add The Add dialog displays 6 In the Value box, type a name for the value to be added to the variable that was created In this example, we add Excellent as a value to the Evaluate Gross Profit Margin % variable

A direct digital controller (DDC) is a small computer which takes the place of one or more local loop controllers, together with many of the switches and relays associated with those controllers Sensors and controlled devices remain and must be connected to the direct digital controller through a real-time interface so that the controller can deal with events as they happen The direct digital controller is shown schematically in Fig 864 Note that it is similar to an IFID and can function in a manner similar to an IFID when connected to a central console The direct digital controller contains most of or all the software formerly associated with the central console, so that the central console may no longer be needed All the direct digital controllers in a system, building, or complex can be connected to a common bus through which they can communicate with one another A central console can also be connected to the bus and can be used for data acquisition, monitoring, and display and for operator interface In some sys-

public static void init(String url, String userName, String password) { // Load the JDBC driver if (conn == null) { try { DriverManagerregisterDriver(new oraclejdbcdriverOracleDriver()); } catch (Exception e) { Systemerrprintln("Could not load driver "); eprintStackTrace(); } aURL = url; aUserName = userName; aPassword = password; } } public static Connection createConnection() { try { // Establish the connection to the database conn = DriverManagergetConnection(aURL, aUserName, aPassword); } catch (Exception e) { Systemerrprintln("Could not create connection " + egetMessage()); eprintStackTrace(); conn = null; } return conn; } public static Connection getConnection() { Connection toRet = null; if (conn == null) toRet = createConnection(); else toRet = conn; return toRet; } 378

9:

Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website

7 Click OK 8 Repeat steps 5 and 6 to add other values to the variable In this example, we add Average and Poor values Our Values work area now contains the three values, as shown here:

} This example uses the Java Database Connectivity (JDBC) thin driver from Oracle; make sure your WebSphere server has access to this class either by having the JDBC driver registered as a JDBC Resource in the Administrator console or by updating the classpath of the Web module you are using for deploying this servlet If you don't perform either of these actions, you will get an exception while trying to register the servlet with the application server Of course, if you're using a different database, the respective JDBC driver should be used Servicing the Request The next step is to build the method that will do all the work Since we want the service to be available in the most flexible way, we implement the doGet method of the servlet This method accepts a number of arguments from the request object and proceeds to build the configuration tree The code for the method is shown here: public void doGet( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { responsesetContentType("text/html"); PrintWriter out (responsegetOutputStream()); = new PrintWriter

Expression Definition of the variable 9 From the Page Explorer, navigate to the report page 10 In the work area, click on the list column body for which you want to set the conditional style We are using Gross Profit % column for this example 11 In the Properties pane, click the Style Variable property and then click the ellipsis The Style Variable window displays 12 From the Variable list, select the variable that you created 13 Click OK In the Properties pane, the name of the variable displays in the Style Variable property

tems, set points and other software variables can be reset from the central console The variables can also be reset at the direct digital controller Most direct digital controllers are special-purpose microcomputers, designed for control purposes A typical controller can connect to 12 to 24 points, although some are larger Local display and access varies greatly, depending on the manufacturer

String nodeKey = requestgetParameter("nodeKey"); String rootSerialId = requestgetParameter("serialsT"); String rootPartId = requestgetParameter("partId"); String rootPartDesc = requestgetParameter("partDesc"); String rootRevision = requestgetParameter("rev"); String quantity = requestgetParameter("qty"); outprintln("<html>"); outprintln("<head><title>Configuration View</title></head>"); outprintln("<body>"); outprintln("<applet code=\"TreeApplet\" width=\"250\" height=\"300\"" + "archive=\"Treemenujar\">" outprintln("<param name=\"nodeOffset\" value=\"25\">"); outprintln("<param name=\"image1\"" + "value=\"closed|/IconImages/closedfoldergif\">"); outprintln("<param name=\"image2\" + "value=\"open|/IconImages/openfoldergif\">"); outprintln("<param name=\"image3\" + "value=\"document|/IconImages/documentgif\">"); 379

14 From the Condition Explorer tab, click one of the values under your variable The Explorer Bar turns green, as shown next, indicating that any changes you make apply only to the selected variable value

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