[英]Multiple series Issue in line chart using JDBCCategoryDataset
我想添加多個系列以在Java應用程序中使用JFreeChart
創建折線圖。 我從數據庫中檢索值,並使用這些值生成圖表。 但是,此時圖表上僅顯示一條線。 任何人都可以幫助同時顯示到行中嗎?
try{
String query = "SELECT hardware, SUM(Quantity) FROM request_1v2 where date "
+ "between '"+txt1+"' and '"+txt2+"'group by hardware";
String querys = "SELECT hardware, SUM(Quantity) FROM request_1v2 where date "
+ "between '"+txt5+"' and '"+txt6+"'group by hardware";
JDBCCategoryDataset dataset1 = new JDBCCategoryDataset(dbConnection.dbConnector());
dataset1.executeQuery(query);
JDBCCategoryDataset dataset2 = new JDBCCategoryDataset(dbConnection.dbConnector());
dataset2.executeQuery(querys);
System.out.println(dataset1);
JFreeChart chart = ChartFactory.createLineChart("Hardware booked out between "+txt1+" and "+txt2+"", "Hardware", "Number", dataset1, PlotOrientation.VERTICAL, false, true, true);
ChartPanel chartPanel = new ChartPanel(chart);
panel.removeAll();
panel.add(chartPanel, BorderLayout.CENTER);
panel.validate();
JFreeChart chart1 = ChartFactory.createLineChart("Hardware booked out between "+txt5+" and "+txt6+"", "Hardware", "Number", dataset2, PlotOrientation.VERTICAL, false, true, true);
ChartPanel chartPanel1 = new ChartPanel(chart1);
panel_1.removeAll();
panel_1.add(chartPanel1, BorderLayout.CENTER);
panel_1.validate();
String sql = "select * from request_1v2 where Date between '"+txt1+"' and '"+txt2+"' order by date desc";
PreparedStatement pst = connection.prepareStatement(sql);
pst=connection.prepareStatement(sql);
ResultSet rs = pst.executeQuery();
table.setModel(DbUtils.resultSetToTableModel(rs));
}catch (Exception e){
JOptionPane.showConfirmDialog(null, e);
}
JDBCCategoryDataset
指定“第一列將是類別名稱,其余列的值(每個列代表一個系列)”。 要獲得兩個系列,您需要選擇三個屬性。 它應該是可以使用別名,在單個查詢來區分引用同一個表,如建議在這里 ,可能是這樣的:
SELECT hardware, SUM(t1.quantity) AS Series1, SUM(t2.quantity) AS Series2
FROM request_1v2 t1, request_1v2 t2
WHERE t1.date BETWEEN …
另外,您可以將兩個數據集合並到新的CategoryDataset
並使用它來創建單個圖表。
DefaultCategoryDataset dcd = new DefaultCategoryDataset();
for (int i = 0; i < dataset1.getColumnCount(); i++) {
dcd.addValue(dataset1.getValue(dataset1.getRowKey(0), dataset1.getColumnKey(i)),
dataset1.getRowKey(0), dataset1.getColumnKey(i));
dcd.addValue(dataset2.getValue(dataset2.getRowKey(0), dataset2.getColumnKey(i)),
dataset2.getRowKey(0), dataset1.getColumnKey(i));
}
JFreeChart chart = ChartFactory.createLineChart(…, dcd, …);
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