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nested elements of the list items (that have unordered list items in them) invisible. That is, we make all the list items that have unordered list items in them appear in collapsed mode. To apply the expansion functionality, we attach a click event to each of the list items (that has an unordered list item in it), one by one. In the event handler, we check whether the list item on which the click event has occurred has the style rule plusimageapply applied to it. If it does, we display the hidden contents of the list item. We then remove the style properties of style rule plusimageapply and apply the style properties of the style rule minusimageapply to replace the plus icon with the minus icon for the expanded list items. If the list item that was clicked has a minus icon on its left that is, if the style rule plusimageapply is not applied to it we hide the nested contents. We also remove the style properties of style rule minusimageapply and apply the style properties of the style rule plusimageapply to replace the minus icon with the plus icon for the list items that is in collapsed mode (we need to collapse the list item that has the minusimageapply style rule applied on it and is clicked). Initially, the list items will appear in collapsed mode with a plus icon on their left, as shown in Figure 7-19.

Figure 9-7. Invoking GetExportedKeys for MySQL (XML output)

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package jcb.bcm; import java.sql.*; /** * This client demonstrates the Basic Connection Management * (BCM package) using the data source name, user, password, * and database name. These values override the default values. */ public class TestConnectionFactory3 { // the only reference to the ConnectionManager static ConnectionManager cm = null; public static void main(String[] args){ Connection conn1 = null; Connection conn2 = null; Connection conn3 = null; try{ // get the only instance of ConnectionManager cm = cm.getInstance(); // get Oracle connection and override the default values conn1 = cm.getConnection(ConnectionManager.DATA_SOURCE_ORACLE, "scott", "tiger", "scorpian"); System.out.println("oracle connection="+conn1); // get a connection to an Access database using JDBC-ODBC // NOTE: the odbc data source is registered by // Microsoft's ODBC Data Source Administrator conn2 = cm.getConnection(ConnectionManager.DATA_SOURCE_ODBC, null, null, "northwind"); System.out.println("odbc connection="+conn2); // get a connection to MySQL database conn3 = cm.getConnection(ConnectionManager.DATA_SOURCE_MYSQL, "root", "root", "snipit"); System.out.println("odbc connection="+conn3); } catch(Exception e){ // handle the exceptions e.printStackTrace(); } finally{ // close all connections DatabaseUtil.close(cm); DatabaseUtil.close(conn1); DatabaseUtil.close(conn2); DatabaseUtil.close(conn3); } } }

This is the output: $ javac TestConnectionFactory3.java $ java jcb.bcm.TestConnectionFactory3 Connection not created. Opening connection phase... Connecting to 1 database... Connection successful.. oracle connection=oracle.jdbc.driver.OracleConnection@106082 Connection not created. Opening connection phase... Connecting to 3 database... Connection successful.. odbc connection=sun.jdbc.odbc.JdbcOdbcConnection@1006d75 Connection not created. Opening connection phase... Connecting to 2 database... Connection successful.. odbc connection=com.mysql.jdbc.Connection@95c083 Closing connection

Figure 7-19. Two list items in collapsed mode When you select the plus icon (or the list item itself), it will be expanded to show the nested unordered list in it, and the plus icon will be replaced with the minus icon, as shown in Figure 7-20. The list item Assam has an unordered list item in it, and that is why it has a plus icon on its left.

Figure 9-8. Invoking GetExportedKeys for Oracle (XML output)

The BCM package has the following features: The ConnectionManager is implemented as a singleton pattern. The ConnectionFactory is an abstract class, and it is implemented as a singleton pattern. Connection objects are instantiated by the following arguments: Database user Database user s password Database name The BCM package has three specific factory classes that provide connections (note that each specific connection factory will create one connection, at most, and it will reuse connections as needed): OracleConnectionFactory (creates Oracle Connection objects) MysqlConnectionFactory (creates Oracle Connection objects) OdbcConnectionFactory (creates JDBC-ODBC Connection objects)

Figure 7-20. Contents of first list item displayed when clicked When you select the plus icon of the Assam list item, it will be expanded to show the hidden list items in it, and the plus icon will be replaced with the minus icon.

The purpose of ConnectionManager is to manage connections supplied by the ConnectionFactory class. The ConnectionManager is extensible, and you may add data sources. The ConnectionFactory is responsible for delivering connections to the ConnectionManager class (the ConnectionManager class manages only those connection created by the ConnectionFactory class). package jcb.bcm; import java.sql.*; /** * This class manages database connections. * This is a "singleton" class. A singleton * class is a class with only one object for

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