Using FusionCharts with JSP > Creating Drill-down charts
In our previous example, we had used FusionCharts to plot a chart using data stored in database. We'll now extend that example itself to create a drill-down chart which can show more information.
If you recall from previous example, we were showing the sum of factory output in a pie chart as under:
<%@ include file="../Includes/DBConn.jsp"%>
<%@ page import="java.sql.Statement"%>
<%@ page import="java.sql.ResultSet"%>
<%@ page import="java.sql.Date"%>
<HTML>
<HEAD>
<TITLE>FusionCharts - Database and Drill-Down Example</TITLE>
<SCRIPT LANGUAGE="Javascript" SRC="../../FusionCharts/FusionCharts.js"></SCRIPT>
</HEAD>
<BODY>
<%
/*
In this example, we show how to connect FusionCharts to a database.
For the sake of ease, we've used a database with just contains two tables,
which are linked to each other.
*/
//Database Objects - Initialization
Statement st1=null,st2=null;
ResultSet rs1=null,rs2=null;
String strQuery="";
//strXML will be used to store the entire XML document generated
String strXML="";
//We also keep a flag to specify whether we've to animate the chart or not.
//If the user is viewing the detailed chart and comes back to this page, he shouldn't
//see the animation again.
String animateChart=null;
animateChart = request.getParameter("animate");
//Set default value of 1
if(null==animateChart||animateChart.equals("")){
animateChart = "1";
}
//Generate the chart element
strXML = "<chart caption='Factory Output report' subCaption='By Quantity'
pieSliceDepth='30' showBorder='1' formatNumberScale='0' numberSuffix=' Units'
animation='" + animateChart + "'>";
//Query to retrieve data
strQuery = "select * from Factory_Master";
st1=oConn.createStatement();
rs1=st1.executeQuery(strQuery);
String factoryId=null;
String factoryName=null;
String totalOutput="";
String strDataURL="";
while(rs1.next()) {
factoryId=rs1.getString("FactoryId");
factoryName=rs1.getString("FactoryName");
strQuery = "select sum(Quantity) as TotOutput from Factory_Output where
FactoryId=" + factoryId;
st2=oConn.createStatement();
rs2 = st2.executeQuery(strQuery);
if(rs2.next()){
totalOutput=rs2.getString("TotOutput");
}
// Encoding the URL since it has a parameter
strDataURL = encodeDataURL("Detailed.jsp?FactoryId="+factoryId,"false",response);
//Generate <set label='..' value='..'/>
strXML += "<set label='" + factoryName + "' value='" +totalOutput+ "'
link='"+strDataURL+"' />";
//Close recordset
rs2=null;
st2=null;
}
//Finally, close <chart> element
strXML += "</chart>";
//close resultset,statement,connection
try {
if(null!=rs1){
rs1.close();
rs1=null;
}
}catch(java.sql.SQLException e){
//do something
System.out.println("Could not close the resultset");
}
try {
if(null!=st1) {
st1.close();
st1=null;
}
}catch(java.sql.SQLException e){
//do something
System.out.println("Could not close the statement");
}
try {
if(null!=oConn) {
oConn.close();
oConn=null;
}
}catch(java.sql.SQLException e){
//do something
System.out.println("Could not close the connection");
}
//Create the chart - Pie 3D Chart with data from strXML
String chartCode = createChart("../../FusionCharts/Pie3D.swf", "",
strXML, "FactorySum", 600, 300, false, false);
%>
<%=chartCode%>
</BODY>
</HTML>
As you can see in the code above, we're doing the following:
- Include FusionCharts.js JavaScript class and FusionCharts.asp , to enable easy embedding of FusionCharts.
- We then include DBConn.jsp, which gives the connection to our Access database.
- Thereafter, we generate the XML data document by iterating through the resultset. We store the XML data in strXML variable. To each <set> element, we add the link attribute, which points to Detailed.jsp - the page that contains the chart to show details. We pass the factory id of the respective factory by appending it to the link. We finally URL Encode the link, which is a very important step.
- Finally, we create the chart using createChart() method and pass strXML as dataXML and render the chart.
Let's now shift our attention to Detailed.jsp page.
<%@ include file="../Includes/DBConn.jsp"%>
<%@ page import="java.sql.Statement"%>
<%@ page import="java.sql.ResultSet"%>
<%@ page import="java.text.SimpleDateFormat"%>
<HTML>
<HEAD>
<TITLE>FusionCharts - Database and Drill-Down Example</TITLE>
<SCRIPT LANGUAGE="Javascript" SRC="../../FusionCharts/FusionCharts.js"></SCRIPT>
</HEAD>
<BODY>
<%
/*This page is invoked from Default.jsp. When the user clicks on a pie
slice in Default.jsp, the factory Id is passed to this page. We need
to get that factory id, get the information from database and then show
a detailed chart.
*/
//First, get the factory Id
String factoryId=null;
//Request the factory Id from parameters
factoryId = request.getParameter("FactoryId");
String chartCode="";
if(null!=factoryId){
ResultSet rs=null;
String strQuery;
Statement st=null;
java.sql.Date date=null;
java.util.Date uDate=null;
String uDateStr="";
String quantity="";
String strXML="";
//Generate the chart element string
strXML = "<chart palette='2' caption='Factory " +factoryId +" Output '
subcaption='(In Units)' xAxisName='Date' showValues='1' labelStep='2' >";
//Now, we get the data for that factory
strQuery = "select * from Factory_Output where FactoryId=" +factoryId;
st=oConn.createStatement();
rs = st.executeQuery(strQuery);
while(rs.next()){
date=rs.getDate("DatePro");
quantity=rs.getString("Quantity");
if(date!=null) {
uDate=new java.util.Date(date.getTime());
// Format the date so that the displayed date is easy to read
SimpleDateFormat sdf=new SimpleDateFormat("dd/MM");
uDateStr=sdf.format(uDate);
}
strXML += "<set label='" +uDateStr+"' value='" +quantity+"'/>";
}
//Close <chart> element
strXML +="</chart>";
//close resultset,statement,connection
try {
if(null!=rs){
rs.close();
rs=null;
}
}catch(java.sql.SQLException e){
//do something
System.out.println("Could not close the resultset");
}
try {
if(null!=st) {
st.close();
st=null;
}
}catch(java.sql.SQLException e){
//do something
System.out.println("Could not close the statement");
}
try {
if(null!=oConn) {
oConn.close();
oConn=null;
}
}catch(java.sql.SQLException e){
//do something
System.out.println("Could not close the connection");
}
//Create the chart - Column 2D Chart with data from strXML
chartCode=createChart("../../FusionCharts/Column2D.swf", "",
strXML, "FactoryDetailed", 600, 300, false, false);
}
%>
<%=chartCode%>
<BR>
<a href='Default.jsp?animate=0'>Back to Summary</a> <BR>
</BODY>
</HTML>
In this page, we're:
- Including FusionCharts.js JavaScript class and FusionCharts.jsp , to enable easy embedding of FusionCharts.
- Requesting the factory id for which we've to show detailed data. This data was sent to us as querystring, as a part of pie chart link.
- We get the requisite data for this factory from database and then convert it into XML using string concatenation.
- Finally, we create a Column 2D chart using createChart() method to show detailed data and render it.
When you now run the app, you'll see the detailed page as under:
