Build Semantic Layer Views for Cassandra Data in APOS Live Data Gateway



Use the CData Connect Cloud and APOS Live Data Gateway to build Semantic Layer Views for Cassandra data.

APOS Live Data Gateway (LDG) serves as a data connection and data transformation solution, facilitating live data connectivity and broadening data source possibilities for SAP Analytics Cloud and other SAP solutions. When integrated with CData Connect Cloud, users have the capability to construct semantic layer views for real-time access to Cassandra data, enabling real-time analytics on Cassandra in a manner akin to working with a relational database.

CData Connect Cloud offers a dedicated SQL Server interface for Cassandra, enabling data querying directly from Cassandra without the need to replicate data to a native database. With pre-optimized data processing capabilities, CData Connect Cloud efficiently directs all supported SQL operations, including filters and JOINs, directly to Cassandra. This harnesses server-side processing to swiftly retrieve the requested Cassandra data.

Configure Cassandra Connectivity for APOS Live Data Gateway

Connectivity to Cassandra from APOS Live Data Gateway is made possible through CData Connect Cloud. To work with Cassandra data from APOS Live Data Gateway, we start by creating and configuring a Cassandra connection.

  1. Log into Connect Cloud, click Connections and click Add Connection
  2. Select "Cassandra" from the Add Connection panel
  3. Enter the necessary authentication properties to connect to Cassandra.

    Set the Server, Port, and Database connection properties to connect to Cassandra. Additionally, to use internal authentication set the User and Password connection properties.

  4. Click Create & Test
  5. Navigate to the Permissions tab in the Add Cassandra Connection page and update the User-based permissions.

Add a Personal Access Token

If you are connecting from a service, application, platform, or framework that does not support OAuth authentication, you can create a Personal Access Token (PAT) to use for authentication. Best practices would dictate that you create a separate PAT for each service, to maintain granularity of access.

  1. Click on your username at the top right of the Connect Cloud app and click User Profile.
  2. On the User Profile page, scroll down to the Personal Access Tokens section and click Create PAT.
  3. Give your PAT a name and click Create.
  4. The personal access token is only visible at creation, so be sure to copy it and store it securely for future use.

Connecting to Cassandra & Creating a Semantic Layer View

After configuring the connection in CData Connect Cloud you are ready to connect to Cassandra in the Live Data Gateway Admin tool and build a semantic layer view in the Live Data Gateway Web UI.

Configuring the Connection to Cassandra

  1. Log into your APOS Live Data Gateway Manager
  2. If you haven't already, update your APOS LDG license file
    1. Click File -> Configurations
    2. Click on the "..." Menu for the License
    3. Select the license file from the APOS team that includes your CData Connect Cloud license
  3. In the APOS Live Data Gateway Manager, click "Add"
  4. In the APOS Live Data Gateway On the Connection tab, configure the connection:
    • Set Data Source to "Database"
    • Set Database to "JDBC Generic"
    • Set Connection String to a connection string similar to the following, using the name of the connection you configured earlier, e.g. jdbc:sqlserver://tds.cdata.com:14333;databaseName=Cassandra1
    • Set Driver Class to "com.CData.connect.Driver" (this should be set by default)
  5. Click Test Connection
  6. Click Save
  7. Give your connection a unique prefix (e.g. "cassandra")
  8. Highlight the newly created connection and click File -> "Approve Users For Web UI"
  9. Approve the appropriate DB users to create views and click "Save"

At this point, we are ready to build our semantic layer view in the Live Data Gateway Web UI.

Creating a Semantic Layer View

  1. In your browser, navigate to the APOS Live Data Gateway Portal
  2. Select a Connection (e.g. "cassandra")
  3. Set User Name and Password to your Connect Cloud username and PAT .
  4. Click "Login"
  5. Once connected, click "Semantic Layer" to create a new semantic layer view
  6. Click "New Semantic Layer View"
  7. Set the Semantic Layer View Prefix and Semantic Layer View Name
  8. Click "Step 2"
  9. Select the table(s) and column(s) you wish to include in your view
  10. Click "Step 3"
  11. Select the Measures from the available table columns
  12. Click "Step 5" (we skipped the "Extra Dimensions" step)
  13. Add any Variable Prompts
  14. Click "Step 6"
  15. Define any Table Joins
  16. Click "Review"
  17. Review you semantic layer view and click "Save"

With the Semantic Layer View created, you are ready to access your Cassandra data through the APOS Live Data Gateway, enabling real-time data connectivity to Cassandra data from SAP Analytics Cloud and other SAP solutions.

Get CData Connect Cloud

To get live data access to 100+ SaaS, Big Data, and NoSQL sources directly from your SQL Server database, try CData Connect Cloud today!

Ready to get started?

Learn more about CData Connect Cloud or sign up for free trial access:

Free Trial