从MySQL数据库中读取SmartGWT ScatterPlot Chart的数据

Question

我正在创建一个smartgwt散点图，但我无法让它读取mysql数据库中的数据并显示出来。部分代码如下：

ScatterPlotChart.java

public class ScatterPlotChart {
    private static FacetChart scatterPlot;
    private static Facet metric;
    private static Facet patient;
    private static DynamicForm typeForm;
    private static SelectItem linesTypeItem;
    public static VStack scatterChartStack;

    public static VStack getScatterPlot() {     
        scatterPlot = new FacetChart();
        scatterPlot.setData(ResultGrid.dataRecords);
        scatterPlot.setID("scatterPlotChart");

        metric = new Facet();
        metric.setValues(new FacetValue("y"), new FacetValue("x"));
        metric.setInlinedValues(true);
        metric.setId("metric");

        patient = new Facet();
        patient.setId("patientID");

        scatterPlot.setFacets(metric, patient);
        scatterPlot.setValueProperty("y");
        scatterPlot.setChartType(ChartType.SCATTER);
        scatterPlot.setTitle("Scatter Plot");
        scatterPlot.setShowScatterLines(true);
        scatterPlot.setDataLineType(DataLineType.SMOOTH);

        scatterChartStack = new VStack(15);
        scatterChartStack.setWidth100();
        scatterChartStack.setHeight(400);
        scatterChartStack.addMembers(scatterPlot);
        scatterChartStack.setVisible(false);

        return scatterChartStack;
    }
}

ResultGrid.java

public class ResultGrid {
    public static ListGrid resultGrid;
    public static Record[] dataRecords;

    public static ListGrid getResultGrid() {

        resultGrid = new ListGrid();
        resultGrid.setAutoFetchData(true);
        resultGrid.setShowAllRecords(true);
        resultGrid.setCanEdit(false);
        resultGrid.setShowRecordComponents(true);          
        resultGrid.setShowRecordComponentsByCell(true);
        resultGrid.setDataSource(DataSource.get("sampledb"));

        dataRecords = resultGrid.getRecords();

        return resultGrid;
    }
}

ResultGrid.java是用于在数据库中显示数据的listgrid，ScatterPlotChart.java用于绘制散点图。在ResultGrid.java中，我有ListGridFields，也设置了字段。我通过dataRecords传递的数据库记录数组。请帮忙！