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DataBind Spark Data to the DevExpress Data Grid

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

The CData ADO.NET Provider for Spark 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.

SparkSQL への接続

SparkSQL への接続を確立するには以下を指定します。

  • Server:SparkSQL をホストするサーバーのホスト名またはIP アドレスに設定。
  • Port:SparkSQL インスタンスへの接続用のポートに設定。
  • TransportMode:SparkSQL サーバーとの通信に使用するトランスポートモード。有効な入力値は、BINARY およびHTTP です。デフォルトではBINARY が選択されます。
  • AuthScheme:使用される認証スキーム。有効な入力値はPLAIN、LDAP、NOSASL、およびKERBEROS です。デフォルトではPLAIN が選択されます。

Databricks への接続

Databricks クラスターに接続するには、以下の説明に従ってプロパティを設定します。Note:The needed values can be found in your Databricks instance by navigating to 'Clusters', selecting the desired cluster, and selecting the JDBC/ODBC tab under 'Advanced Options'.

  • Server:Set to the Server Hostname of your Databricks cluster.
  • Port:443
  • TransportMode:HTTP
  • HTTPPath:Set to the HTTP Path of your Databricks cluster.
  • UseSSL:True
  • AuthScheme:PLAIN
  • User:'token' に設定。
  • Password:Set to your personal access token (value can be obtained by navigating to the User Settings page of your Databricks instance and selecting the Access Tokens tab).

Windows Forms Controls

The code below shows how to populate a DevExpress chart with Spark data. The SparkSQLDataAdapter 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 (SparkSQLConnection connection = new SparkSQLConnection( "Server=127.0.0.1;")) { SparkSQLDataAdapter dataAdapter = new SparkSQLDataAdapter( "SELECT City, Balance FROM Customers", 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[] { "Balance" }); 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 Spark data. The SparkSQLDataAdapter 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 (SparkSQLConnection connection = new SparkSQLConnection( "Server=127.0.0.1;")) { SparkSQLDataAdapter SparkSQLDataAdapter1 = new SparkSQLDataAdapter("SELECT City, Balance FROM Customers", connection); DataTable table = new DataTable(); SparkSQLDataAdapter1.Fill(table); DevExpress.XtraCharts.Series series = new Series("Series1", ViewType.Bar); WebChartControl1.Series.Add(series); series.DataSource = table; series.ValueDataMembers.AddRange(new string[] { "Balance" }); series.ArgumentScaleType = ScaleType.Qualitative; series.ArgumentDataMember = "City"; series.ValueScaleType = ScaleType.Numerical; ((DevExpress.XtraCharts.SideBySideBarSeriesView)series.View).ColorEach = true; }
 
 
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