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Chip 2005 March
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CMCD0305.ISO
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Grafica
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3dpie
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TemplateScripts
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JSP
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PieAppletDB.jsp
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2004-07-02
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<%@ page import="java.sql.*" %>
<%@ page import="java.util.*" %>
<%@ page import="java.lang.*" %>
<%@ page import="java.io.*" %>
<%
//-------------------------------------------------------------------
//
// This simple JSP is designed to demonstrate how a JSP can be used
// to retrieve data from a database and construct a dynamic page
// containing the graphing applet.
//
// You may freely copy and modify this script to suite your own
// requirements.
//
// For further information visit,
// http://www.jpowered.com/pie_chart/
//
//-------------------------------------------------------------------
// Initialise and set variables
String url = "jdbc:MySQL:///TESTDB"; // URL specifying the JDBC connection to a MySQL database TESTDB.
Connection con = null; // Database connection object
Statement stmt = null; // Statement String
String query; // Query String
int datacount;
ResultSet srs1 = null;
ResultSet srs2 = null;
// Establish the database connection
try {
// Connect to TESTDB
Class.forName("org.gjt.mm.mysql.Driver");
con = DriverManager.getConnection (url,"[DB Username]","[DB Password]");
stmt = con.createStatement();
} // End try
// Error handling
catch(ClassNotFoundException e) {out.println("Could not load database driver: " + e.getMessage());}
catch(SQLException e) {out.println("SQLException caught: " + e.getMessage());}
%>
<html>
<head>
<title>3D Pie Chart</title>
</head>
<body>
<applet code='PiechartApplet.class' archive='Piechart.jar' width='500' height='420'>
<!-- Start Up Parameters -->
<PARAM name='LOADINGMESSAGE' value='Pie Chart Loading - Please Wait.'> <!-- Message to be displayed on Startup -->
<PARAM name='STEXTCOLOR' value='0,0,100'> <!-- Message Text Color-->
<PARAM name='STARTUPCOLOR' value='255,255,255'> <!-- Applet Background color -->
<!-- Property file -->
<PARAM name='chartproperties' value='piepropsdb.txt'>
<!-- Chart Data -->
<%
try {
// Performing SQL query for Product X
query = "Select Value from SalesBar where Year=2004 and Product='X' ORDER BY Month";
srs1 = stmt.executeQuery(query);
// Write out the data for Series 1
datacount = 1;
while (srs1.next()) {
out.println("<param name='data"+datacount+"series1' value='"+srs1.getString("Value")+"'>\n");
datacount++;
}
// Performing SQL query for Product Y
query = "Select Value from SalesBar where Year=2004 and Product='Y' ORDER BY Month";
srs2 = stmt.executeQuery(query);
// Write out the data for Series 2
datacount = 1;
while (srs2.next()) {
out.println("<param name='data"+datacount+"series2' value='"+srs2.getString("Value")+"'>\n");
datacount++;
}
}
// Error handling
catch(SQLException e) {out.println("SQLException caught: " + e.getMessage());}
// All finished so close the database connection
finally {
try {if (con != null) con.close();}
catch (SQLException e) {}
}
%>
</applet>
</body>
</html>