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DataBind Charts to HPCC Systems Data

Use the standard ADO.NET procedures for databinding to provide bidirectional access to HPCC Systems data from controls in the Visual Studio toolbox. This article demonstrates a graphical approach using wizards in Visual Studio, as well as how to databind with only a few lines of code.

DataBinding enables bidirectional access to data from UI controls. You can use the CData ADO.NET Provider for HPCC Systems to easily databind HPCC Systems data to Windows Forms and Web controls in Visual Studio. This article shows how to use wizards to databind HPCC Systems data to a chart that reflects any changes. The code walk-through section shows how to create a chart in 10 lines of code.

DataBind to a Chart

DataBinding consists of three steps: Instantiate the control, configure the data source, and databind.

Configure the Connection and Select Database Objects

Follow the procedure below to use the Data Source Configuration Wizard to create a chart control and the connection to HPCC Systems. In the wizard, you can select the HPCC Systems entities you want to databind.

  1. In a Windows Forms project, drag and drop a Chart control from the toolbox to the form. In the Data section of the Chart properties, select DataSource and then select Add Project Data Source from the menu.
  2. In the Data Source Configuration Wizard that appears, select Database -> Dataset.
  3. In the Choose Your Data Connection step, click New Connection.
  4. In the Add Connection dialog, click Change to select the CData HPCC Systems Data Source.

    Below is a typical connection string:

    URL=http://127.0.0.1:8510;User=test;password=xA123456;Version=1;Cluster=hthor;

    To connect, set the following connection properties: Set URL to the machine name or IP address of the server and the port the server is running on, for example, https://server:port. The User and Password are required to authenticate to the HPCC Systems cluster specified in the URL. Note that LDAP authentication is not currently supported by our ODBC driver.

    Set Version to the WsSQL Web server version. Note that if you have not already done so, you will need to install the WsSQL service on the HPCC Systems server. The WsSQL Web service is used to interact with the underlying HPCC Systems platform.

    Set Cluster to the target cluster.

    When you configure the connection, you may also want to set the Max Rows connection property. This will limit the number of rows returned, which is especially helpful for improving performance when designing reports and visualizations.

  5. Choose the database objects you want to work with. This example uses the hpcc::test::orders table.

DataBind

After adding the data source and selecting database objects, you can bind the objects to the chart. This example assigns the x-axis to CustomerName and the y-axis to Price.

  1. In the Chart properties, click the button in the Series property to open the Series Collection Editor.
  2. In the Series properties, select the columns you want for the x- and y-axes: Select columns from the menu in the XValueMember and YValueMember properties.

The chart is now databound to the HPCC Systems data. Run the chart to display the current data.

Code Walk-through

DataBinding to HPCC Systems data requires only a few lines of code and can be completed in three easy steps.

  1. Connect to HPCC Systems.
  2. Create the HPCCDataAdapter to execute the query and create a DataSet to be filled with its results.
  3. DataBind the result set to the chart.

Below is the complete code:

HPCCConnection conn = new HPCCConnection("URL=http://127.0.0.1:8510;User=test;password=xA123456;Version=1;Cluster=hthor;"); HPCCCommand comm = new HPCCCommand("SELECT SUM(hpcc::test::orders.Price), hpcc::test::customers.CustomerName FROM hpcc::test::orders INNER JOIN hpcc::test::customers ON hpcc::test::orders.CustomerId=hpcc::test::customers.CustomerId;GROUP BY hpcc::test::customers.CustomerName", conn); HPCCDataAdapter da = new HPCCDataAdapter(comm); DataSet dataset = new DataSet(); da.Fill(dataset); chart1.DataSource = dataset; chart1.Series[0].XValueMember = "CustomerName"; chart1.Series[0].YValueMembers = "Price"; // Insert code for additional chart formatting here. chart1.DataBind();