DataBind Cassandra Data to the DevExpress Data Grid

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Cassandra ADO.NET Provider

Connect .NET applications with the Cassandra real-time NoSQL cloud database service. Use Apache Cassandra as the big data backend that powers your .NET applications.



Use the CData ADO.NET Provider for Cassandra with the DevExpress Windows Forms and Web controls to provide Cassandra data to a chart.

The CData ADO.NET Provider for Cassandra 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, Port, and Database connection properties to connect to Cassandra. Additionally, to use internal authentication set the User and Password connection properties.

Windows Forms Controls

The code below shows how to populate a DevExpress chart with Cassandra data. The CassandraDataAdapter 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 (CassandraConnection connection = new CassandraConnection( "Database=MyCassandraDB;Port=7000;Server=127.0.0.1;")) { CassandraDataAdapter dataAdapter = new CassandraDataAdapter( "SELECT City, SUM(TotalDue) FROM Customer GROUP BY City", 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[] { "TotalDue" }); 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 Cassandra data. The CassandraDataAdapter 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 (CassandraConnection connection = new CassandraConnection( "Database=MyCassandraDB;Port=7000;Server=127.0.0.1;")) { CassandraDataAdapter CassandraDataAdapter1 = new CassandraDataAdapter("SELECT City, SUM(TotalDue) FROM Customer GROUP BY City", connection); DataTable table = new DataTable(); CassandraDataAdapter1.Fill(table); DevExpress.XtraCharts.Series series = new Series("Series1", ViewType.Bar); WebChartControl1.Series.Add(series); series.DataSource = table; series.ValueDataMembers.AddRange(new string[] { "TotalDue" }); series.ArgumentScaleType = ScaleType.Qualitative; series.ArgumentDataMember = "City"; series.ValueScaleType = ScaleType.Numerical; ((DevExpress.XtraCharts.SideBySideBarSeriesView)series.View).ColorEach = true; }