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Get the Report →DataBind Charts to Databricks Data
Use the standard ADO.NET procedures for databinding to provide bidirectional access to Databricks 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 facilitates two-way interaction with data through UI controls. Using the CData ADO.NET Provider for Databricks streamlines the process of binding Databricks data to Windows Forms and Web controls within Visual Studio. In this article, we will demonstrate using wizards to establish a binding between Databricks data and a chart that dynamically updates. Additionally, the code walk-through section will guide you through the creation of a chart using just 10 lines of code.
About Databricks Data Integration
Accessing and integrating live data from Databricks has never been easier with CData. Customers rely on CData connectivity to:
- Access all versions of Databricks from Runtime Versions 9.1 - 13.X to both the Pro and Classic Databricks SQL versions.
- Leave Databricks in their preferred environment thanks to compatibility with any hosting solution.
- Secure authenticate in a variety of ways, including personal access token, Azure Service Principal, and Azure AD.
- Upload data to Databricks using Databricks File System, Azure Blog Storage, and AWS S3 Storage.
While many customers are using CData's solutions to migrate data from different systems into their Databricks data lakehouse, several customers use our live connectivity solutions to federate connectivity between their databases and Databricks. These customers are using SQL Server Linked Servers or Polybase to get live access to Databricks from within their existing RDBMs.
Read more about common Databricks use-cases and how CData's solutions help solve data problems in our blog: What is Databricks Used For? 6 Use Cases.
Getting Started
Binding Data to a Chart
DataBinding to a Chart consists of three steps: Instantiate the control, configure the data source, and databind.
Configure the Connection and Select Database Objects
To create a chart control and establish a connection to Databricks, follow the steps outlined below using the Data Source Configuration Wizard. Within the wizard, you'll have the option to choose the specific Databricks entities you wish to bind to.
- 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.
- In the Data Source Configuration Wizard that appears, select Database -> Dataset.
- In the Choose Your Data Connection step, click New Connection.
In the Add Connection dialog, click Change to select the CData Databricks Data Source.
Below is a typical connection string:
Server=127.0.0.1;Port=443;TransportMode=HTTP;HTTPPath=MyHTTPPath;UseSSL=True;User=MyUser;Password=MyPassword;
To connect to a Databricks cluster, set the properties as described below.
Note: The needed values can be found in your Databricks instance by navigating to Clusters, and selecting the desired cluster, and selecting the JDBC/ODBC tab under Advanced Options.
- Server: Set to the Server Hostname of your Databricks cluster.
- HTTPPath: Set to the HTTP Path of your Databricks cluster.
- Token: Set to your personal access token (this value can be obtained by navigating to the User Settings page of your Databricks instance and selecting the Access Tokens tab).
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.
- Choose the database objects you want to work with. This example uses the Customers 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 City and the y-axis to CompanyName.
- In the Chart properties, click the button in the Series property to open the Series Collection Editor.
- 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 Databricks data. Run the chart to display the current data.
Code Walk-through
DataBinding to Databricks data requires only a few lines of code and can be completed in three easy steps.
- Connect to Databricks.
- Create the DatabricksDataAdapter to execute the query and create a DataSet to be filled with its results.
- DataBind the result set to the chart.
Below is the complete code:
DatabricksConnection conn = new DatabricksConnection("Server=127.0.0.1;Port=443;TransportMode=HTTP;HTTPPath=MyHTTPPath;UseSSL=True;User=MyUser;Password=MyPassword;");
DatabricksCommand comm = new DatabricksCommand("SELECT City, CompanyName FROM Customers WHERE Country = 'US'", conn);
DatabricksDataAdapter da = new DatabricksDataAdapter(comm);
DataSet dataset = new DataSet();
da.Fill(dataset);
chart1.DataSource = dataset;
chart1.Series[0].XValueMember = "City";
chart1.Series[0].YValueMembers = "CompanyName";
// Insert code for additional chart formatting here.
chart1.DataBind();