I need to query the Appian database (MariaBD) from my KPIs application. What would be the best way to do it? Does Appian have any webservice available?
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Appian has an object called Web API specifically designed for this case. You can create a rule to query the data in Appian and expose the result of query using web API as a HTTP response. Which will be response to your KPI application's HTTP request.