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In Oracle, the DBA_USERS table describes all users (in Oracle, user is semantically equivalent to a schema ) of the database. To save space, I have edited the output. $ sqlplus system/password SQL*Plus: Release 10.2.0.1.0 - Production on Sun Sep 25 00:11:49 2005 Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production SQL> select username from dba_users; USERNAME ----------MGMT_VIEW SYS SYSTEM DBSNMP SYSMAN XDB SCOTT ...ANONYMOUS ... HR 27 rows selected.

Step 2: Preparing the JavaBean (Example 1)

Suppose you want to convert the ResultSet into a java.util.List of a specific bean class. Here you specify the bean class to be AnimalBean, as shown next. The DbUtils package s ResultSetHandler class converts a ResultSet into a java.util.List of beans. public class AnimalBean { private int id; private String name; public AnimalBean() { } public void setName(String name) { this.name = name; } public String getName() { return this.name; } public void setId(int id) { this.id = id; } public int getId() { return this.id; } }

You want to manipulate array elements for tasks like applying serial numbers to them, converting them to uppercase, and other tasks similar to these.

Step 3: Using BeanListHandler (Example 1)

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import java.io.PrintWriter; import java.io.IOException; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.List; import java.util.ArrayList; import jcb.util.DatabaseUtil; import jcb.db.VeryBasicConnectionManager; public class GetCatalogs extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Connection conn = null; try { String dbVendor = request.getParameter("vendor").trim(); String outputFormat = request.getParameter("format").trim(); conn = VeryBasicConnectionManager.getConnection(dbVendor); List<String> catalogs = getCatalogs(conn); if (outputFormat.equals("xml")) { printXML(response, catalogs); } else { printHTML(response, catalogs); } } catch(Exception e) { printError(response, e.getMessage()); } finally { DatabaseUtil.close(conn); } } // end doGet private static void printHTML(HttpServletResponse response, List<String> tables) throws Exception { response.setContentType("text/html"); PrintWriter out = response.getWriter(); StringBuilder buffer = new StringBuilder();

This shows how to use BeanListHandler: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 import org.apache.commons.dbutils.DbUtils; import org.apache.commons.dbutils.QueryRunner; import org.apache.commons.dbutils.handlers.BeanListHandler; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.util.List; public class DbUtils_UseBean_MySQL { public static void main(String[] args) { Connection conn = null; String jdbcURL = "jdbc:mysql://localhost/octopus"; String jdbcDriver = "com.mysql.jdbc.Driver"; String user = "root"; String password = "root"; try { DbUtils.loadDriver(jdbcDriver); conn = DriverManager.getConnection(jdbcURL, user, password); QueryRunner qRunner = new QueryRunner(); System.out.println("MySQL: begin using BeanListHandler..."); List beans = (List) qRunner.query(conn, "select id, name from animals_table", new BeanListHandler(AnimalBean.class)); for (int i = 0; i < beans.size(); i++) { AnimalBean bean = (AnimalBean) beans.get(i); bean.print(); } System.out.println("DbUtils_UseBean_MySQL: end."); } catch (SQLException e) { // handle the exception e.printStackTrace(); } finally { DbUtils.closeQuietly(conn); } } }

Let s assume an HTML file that has a heading element to display the message Members of my Group are along with an empty paragraph element, as shown here: <body> <h3> Members of my Group are </h3> <p></p> </body>

Step 4: Running the Test Program (Example 1)

buffer.append("<html><body><table border=1 cellspacing=0 cellpadding=0>"); buffer.append("<TR><TH>Catalogs</TH></TR>"); for (int i=0; i < tables.size(); i++) { buffer.append("<TR><TD>"); buffer.append(tables.get(i)); buffer.append("</TD></TR>"); } buffer.append("</table></body></html>"); out.println(buffer.toString()); } private static void printXML(HttpServletResponse response, List<String> catalogs) throws Exception { response.setContentType("text/xml"); PrintWriter out = response.getWriter(); StringBuilder buffer = new StringBuilder(); buffer.append("< xml version=\"1.0\" encoding=\"ISO-8859-1\" >"); buffer.append("<catalogs>"); for (int i=0; i < catalogs.size(); i++) { buffer.append("<name>"); buffer.append(catalogs.get(i)); buffer.append("</name>"); } buffer.append("</catalogs>"); out.println(buffer.toString()); } private static void printError(HttpServletResponse response, String message) { try { PrintWriter out = response.getWriter(); StringBuffer buffer = new StringBuffer(); buffer.append("<html><body>"); buffer.append(message); buffer.append("</body></html>"); out.println(buffer); } catch(Exception ignore) { } } /** * Get Catalogs: Retrieves the catalog names available in * this database. The results are ordered by catalog name. *

This blank paragraph element will display names taken from an array, with serial numbers applied. The jQuery code to display the array elements along with the serial number is as shown here: $(document).ready(function() { var members = [ "John", "Steve", "Ben", "Damon", "Ian" ]; members = $.map(members, function(n,i){ return(i+1+"."+n); }); $('p').html(members.join("<br />")); });

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