Azure Functions Database Connection String

Question

How do I add or access an app.config file in Azure functions to add a database connection string?

If you\'re not supposed to add an app.config

Answer 1

Below worked for me both locally & in Azure for an http trigger function that queries cosmos db

added Microsoft.Azure.WebJobs.Extensions.CosmosDB nuget package reference to project

connection string settings:

local.settings.json

{
  "ConnectionStrings": {
    "CosmosDBConnection": "AccountEndpoint=foobar;"
  }
}

in Azure portal > function apps > platform features > configurations > Application settings > New application settings > Name: CosmosDBConnection Value: AccountEndpoint=foobar; update > save

sample c# Azure function

public static async Task Run(
           [HttpTrigger(AuthorizationLevel.Anonymous, "get")] HttpRequest req,
           [CosmosDB(databaseName:"dbName",
                     collectionName:"collectionName",
                     ConnectionStringSetting = "CosmosDBConnection")] DocumentClient documentClient, 
           ILogger log){
             .....
           }