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, when paired with the ADO.NET Provider for Presto (or any of 200+ other ADO.NET Providers), 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 and any source supported by the CData ADO.NET Providers.

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

Follow the steps below to begin producing secure Presto OData services:

Deploy

The API Server runs on your own server. On Windows, you can deploy using the stand-alone server or IIS. On a Java servlet container, drop in the API Server WAR file. See the help documentation for more information and how-tos.

The API Server is also easy to deploy on Microsoft Azure, Amazon EC2, and Heroku.

Connect to Presto

After you deploy the API Server and the ADO.NET Provider for Presto, provide authentication values and other connection properties needed to connect to Presto by clicking Settings -> Connections and adding a new connection in the API Server administration console.

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.

You can then choose the Presto entities you want to allow the API Server to access by clicking Settings -> Resources.

Authorize API Server Users

After determining the OData services you want to produce, authorize users by clicking Settings -> Users. The API Server uses authtoken-based authentication and supports the major authentication schemes. Access can also be restricted based on IP address: Connections from all addresses except localhost are blocked by default, so you will need to allow connections from Google's servers for this article. You can authenticate as well as encrypt connections with SSL.

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