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Read article →DataBind HarperDB Data to the DevExpress Data Grid
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HarperDB ADO.NET Provider
Rapidly create and deploy powerful .NET applications that integrate with HarperDB.
Use the CData ADO.NET Provider for HarperDB with the DevExpress Windows Forms and Web controls to provide HarperDB data to a chart.
The CData ADO.NET Provider for HarperDB implements standard ADO.NET data access components that can be used with third-party controls. The standard ADO.NET process for databinding can be followed to enable bidirectional access to live data from UI controls. In this article we show how to use the CData components to databind to the DevExpress Windows Forms and Web controls; you will databind to a chart that displays current data.
Set the Server, User, and Password connection properties to connect to HarperDB. Set UseSSL to secure connections with TLS/SSL.
Windows Forms Controls
The code below shows how to populate a DevExpress chart with HarperDB data. The HarperDBDataAdapter binds to the Series property of the chart control. The Diagram property of the control defines the x- and y-axes as the column names.
using (HarperDBConnection connection = new HarperDBConnection(
"Server=127.0.0.1;User=admin;Password=1234;")) {
HarperDBDataAdapter dataAdapter = new HarperDBDataAdapter(
"SELECT City, CompanyName FROM Customers WHERE Country = 'US'", connection);
DataTable table = new DataTable();
dataAdapter.Fill(table);
DevExpress.XtraCharts.Series series = new DevExpress.XtraCharts.Series();
chartControl1.Series.Add(series);
series.DataSource = table;
series.ValueDataMembers.AddRange(new string[] { "CompanyName" });
series.ArgumentScaleType = DevExpress.XtraCharts.ScaleType.Qualitative;
series.ArgumentDataMember = "City";
series.ValueScaleType = DevExpress.XtraCharts.ScaleType.Numerical;
chartControl1.Legend.Visibility = DevExpress.Utils.DefaultBoolean.False;
((DevExpress.XtraCharts.SideBySideBarSeriesView)series.View).ColorEach = true;
}
Web Controls
The code below shows how to populate a DevExpress Web control with HarperDB data. The HarperDBDataAdapter binds to the Series property of the chart; the Diagram property defines the x- and y-axes as the column names.
using DevExpress.XtraCharts;
using (HarperDBConnection connection = new HarperDBConnection(
"Server=127.0.0.1;User=admin;Password=1234;"))
{
HarperDBDataAdapter HarperDBDataAdapter1 = new HarperDBDataAdapter("SELECT City, CompanyName FROM Customers WHERE Country = 'US'", connection);
DataTable table = new DataTable();
HarperDBDataAdapter1.Fill(table);
DevExpress.XtraCharts.Series series = new Series("Series1", ViewType.Bar);
WebChartControl1.Series.Add(series);
series.DataSource = table;
series.ValueDataMembers.AddRange(new string[] { "CompanyName" });
series.ArgumentScaleType = ScaleType.Qualitative;
series.ArgumentDataMember = "City";
series.ValueScaleType = ScaleType.Numerical;
((DevExpress.XtraCharts.SideBySideBarSeriesView)series.View).ColorEach = true;
}
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