Extend Google Sheets with Presto Data

Make calls to the API Server from Google Apps Script.

Interact with Presto data from Google Sheets through macros, custom functions, and add-ons. The CData API Server enables connectivity to Presto data from cloud-based and mobile applications like Google Sheets. The API Server is a lightweight Web application that produces OData services for Presto.

Google Apps Script can consume these OData services in the JSON format. This article shows how to create a simple add-on that populates a Google Spreadsheet with Customer data and, as you make changes, executes updates to 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

Set Up the API Server

If you have not already done so, download the CData API Server. Once you have installed the API Server, follow the steps below to begin producing secure Presto OData services:

Connect to Presto

To work with Presto data from Google Sheets, we start by creating and configuring a Presto connection. Follow the steps below to configure the API Server to connect to Presto data:

First, navigate to the Connections page.
Click Add Connection and then search for and select the Presto connection.
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.
After configuring the connection, click Save & Test to confirm a successful connection.

Configure API Server Users

Next, create a user to access your Presto data through the API Server. You can add and configure users on the Users page. Follow the steps below to configure and create a user:

On the Users page, click Add User to open the Add User dialog.
Next, set the Role, Username, and Privileges properties and then click Add User.
An Authtoken is then generated for the user. You can find the Authtoken and other information for each user on the Users page:

Creating API Endpoints for Presto

Having created a user, you are ready to create API endpoints for the Presto tables:

First, navigate to the API page and then click Add Table .
Select the connection you wish to access and click Next.
With the connection selected, create endpoints by selecting each table and then clicking Confirm.

Gather the OData Url

Having configured a connection to Presto data, created a user, and added resources to the API Server, you now have an easily accessible REST API based on the OData protocol for those resources. From the API page in API Server, you can view and copy the API Endpoints for the API:

Retrieve Presto Data

Open the Script Editor from your spreadsheet by clicking Tools -> Script Editor. In the Script Editor, add the following function to populate a spreadsheet with the results of an OData query:



function retrieve(){
  var url = "https://MyUrl/api.rsc/Customer?select=Id,FirstName,LastName,Id";
  var response = UrlFetchApp.fetch(url,{
    headers: {"Authorization": "Basic " + Utilities.base64Encode("MyUser:MyAuthtoken")}
  }); 
  var json = response.getContentText();
  var sheet = SpreadsheetApp.getActiveSheet();
  var a1 = sheet.getRange('a1');
  var index=1;
  var customer = JSON.parse(json).value;

  var cols = [["Id","FirstName","LastName","Id"]]; 
  sheet.getRange(1,1,1,4).setValues(cols);

  row=2;
  for(var i in customer){
    for (var j in customer[i]) {
      switch (j) {
        case "Id":
          a1.offset(row,0).setValue(account[i][j]);
          break;
        case "FirstName":
          a1.offset(row,1).setValue(account[i][j]);
          break;
        case "LastName":
          a1.offset(row,2).setValue(account[i][j]);
          break;
        case "Id":
          a1.offset(row,3).setValue(account[i][j]);
          break;
      }      
    }
    row++;
  }
}

Follow the steps below to add an installable trigger to populate the spreadsheet when opened:

Click Resources -> Current Project's Triggers -> Add a New Trigger.
Select retrieve in the Run menu.
Select From Spreadsheet.
Select On open.

After closing the dialog, you are prompted to allow access to the application.

Post Changes to Presto Data

Add the following function to post changes to cells back to the API Server:



function buildReq(e){
  var sheet = SpreadsheetApp.getActiveSheet();
  var changes = e.range;
  var id = sheet.getRange(changes.getRow(),1).getValue();
  var col = sheet.getRange(1,changes.getColumn()).getValue();
  
  var url = "http://MyServer/api.rsc/Customer("+id+")";
  var putdata = "{\"@odata.type\" : \"CDataAPI.Customer\",  \""+col+"\": \""+changes.getValue()+"\"}";;
  UrlFetchApp.fetch(url,{
    method: "put",
    contentType: "application/json",
    payload: putdata,
    headers: {"Authorization": "Basic " + Utilities.base64Encode("MyUser:MyAuthtoken")}
  });

}

Follow the steps below to add the update trigger:

Click Resources -> Current Project's Triggers.
Select buildReq in the Run menu.
Select From Spreadsheet.
Select On edit.

You can test the script by clicking Publish -> Test as Add-On. Select the version, installation type, and spreadsheet to create a test configuration. You can then select and run the test configuration.

As you make changes to cells, the API Server executes updates to Presto data.

Ready to get started?

Learn more or sign up for a free trial:

CData API Server