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URL: https://www.cdata.com/kb/tech/presto-cloud-apos.rst

⇱ Build Semantic Layer Views for Presto Data in APOS Live Data Gateway

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

👁 Dibyendu Datta
Dibyendu Datta
Lead Technology Evangelist
Use the CData Connect AI and APOS Live Data Gateway to build Semantic Layer Views for Presto 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 AI, users have the capability to construct semantic layer views for real-time access to Presto data, enabling real-time analytics on Presto in a manner akin to working with a relational database.

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

About Presto Data Integration

Accessing and integrating live data from Trino and Presto SQL engines has never been easier with CData. Customers rely on CData connectivity to:

  • Access data from Trino v345 and above (formerly PrestoSQL) and Presto v0.242 and above (formerly PrestoDB)
  • Read and write access all of the data underlying your Trino or Presto instances
  • Optimized query generation for maximum throughput.

Presto and Trino allow users to access a variety of underlying data sources through a single endpoint. When paired with CData connectivity, users get pure, SQL-92 access to their instances, allowing them to integrate business data with a data warehouse or easily access live data directly from their preferred tools, like Power BI and Tableau.

In many cases, CData's live connectivity surpasses the native import functionality available in tools. One customer was unable to effectively use Power BI due to the size of the datasets needed for reporting. When the company implemented the CData Power BI Connector for Presto they were able to generate reports in real-time using the DirectQuery connection mode.


Getting Started


Configure Presto Connectivity for APOS Live Data Gateway

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

  1. Log into Connect AI, click Sources, and then click Add Connection
    2. 👁 Adding a Connection
  2. Select "Presto" from the Add Connection panel
    3. 👁 Selecting a data source
  3. Enter the necessary authentication properties to connect to Presto.

    Set the Server and Port connection properties to connect, in addition to any authentication properties that may be required.

    To enable TLS/SSL, set UseSSL to true.

    Authenticating with LDAP

    In order to authenticate with LDAP, set the following connection properties:

    • AuthScheme: Set this to LDAP.
    • User: The username being authenticated with in LDAP.
    • Password: The password associated with the User you are authenticating against LDAP with.

    Authenticating with Kerberos

    In order to authenticate with KERBEROS, set the following connection properties:

    • AuthScheme: Set this to KERBEROS.
    • KerberosKDC: The Kerberos Key Distribution Center (KDC) service used to authenticate the user.
    • KerberosRealm: The Kerberos Realm used to authenticate the user with.
    • KerberosSPN: The Service Principal Name for the Kerberos Domain Controller.
    • KerberosKeytabFile: The Keytab file containing your pairs of Kerberos principals and encrypted keys.
    • User: The user who is authenticating to Kerberos.
    • Password: The password used to authenticate to Kerberos.
    👁 Configuring a connection (Salesforce is shown)
  4. Click Save & Test
  5. Navigate to the Permissions tab in the Add Presto Connection page and update the User-based permissions. 👁 Updating permissions

Add a Personal Access Token

When connecting to Connect AI through the REST API, the OData API, or the Virtual SQL Server, a Personal Access Token (PAT) is used to authenticate the connection to Connect AI. It is best practice to create a separate PAT for each service to maintain granularity of access.

  1. Click on the Gear icon () at the top right of the Connect AI app to open the settings page.
  2. On the Settings page, go to the Access Tokens section and click Create PAT.
  3. Give the PAT a name and click Create. 👁 Creating a new PAT
  4. The personal access token is only visible at creation, so be sure to copy it and store it securely for future use.

With the connection configured and a PAT generated, you are ready to connect to Presto data in the APOS Live Data Gateway.

Connecting to Presto & Creating a Semantic Layer View

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

Configuring the Connection to Presto

  1. Log into your APOS Live Data Gateway Manager 👁 Logging into the APOS LDG 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 AI 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=Presto1
    • Set Driver Class to "com.CData.connect.Driver" (this should be set by default)
    👁 Configuring the Connection (Salesforce is shown).
  5. Click Test Connection
  6. Click Save
  7. Give your connection a unique prefix (e.g. "presto")
  8. Highlight the newly created connection and click File -> "Approve Users For Web UI" 👁 Approving Users For Web UI.
  9. Approve the appropriate DB users to create views and click "Save" 👁 Configuring which DB users can create views.

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. "presto")
  3. Set User Name and Password to your Connect AI username and PAT .
  4. Click "Login" 👁 Connecting from the Web UI (Salesforce is shown).
  5. Once connected, click "Semantic Layer" to create a new semantic layer view
  6. Click "New Semantic Layer View" 👁 Adding a new semantic layer view.
  7. Set the Semantic Layer View Prefix and Semantic Layer View Name 👁 Setting the semantic layer view prefix and name.
  8. Click "Step 2"
  9. Select the table(s) and column(s) you wish to include in your view 👁 Selecting table(s) and column(s).
  10. Click "Step 3"
  11. Select the Measures from the available table columns 👁 Selecting the measure(s).
  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" 👁 Saving the semantic layer view.

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

Get CData Connect AI

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