Connect to Azure SQL DB from a Azure Functions in JS - azure

Question

I am trying to connect to my Azure SQL DB from an azure function written in nodeJS. I have set the connection strings in the application settings and it still does not work. I used ODBC key for connection settings. Did anyone try this? Below is the sample code for my function
var Connection = require('tedious').Connection;
var Request = require('tedious').Request;
// Create connection to database
const config = process.env["sqldb_connection"];
var connection = new Connection(config);
// Attempt to connect and execute queries if connection goes through
connection.on('connect', function(err)
{
if (err)
{
console.log(err)
}
else
{
queryDatabase()
}
}
);
function queryDatabase()
{ console.log('Reading rows from the Table...');
// Read all rows from table
request = new Request(
"SELECT ORG_ID,ORG_NAME FROM org",
function(err, rowCount, rows)
{
console.log(rowCount + ' row(s) returned');
process.exit();
}
);
request.on('row', function(columns) {
columns.forEach(function(column) {
console.log("%s\t%s", column.metadata.colName, column.value);
});
});
connection.execSql(request);
}
I am getting an error saying
Exception while executing function: Functions.HttpTriggerJS2. mscorlib: The given key was not present in the dictionary.

Answer 1

Run the npm install tedious command in the Kudu remote execution console under D:\home\site\wwwroot.
In Azure Functions, all of your code should be put inside the module.exports function.
You should use context.log() instead of console.log().
You really don't have to set the connection settings string in Application settings of the function.
You should inform the runtime when your code has finished by calling context.done().
The following code works for me:
var Connection = require('tedious').Connection;
var Request = require('tedious').Request;
module.exports = function (context, req) {
context.log('JavaScript HTTP trigger function processed a request.');
var config = {
userName: '<userName>',
password: '<password>',
server: '<AzureSQLDBName>.database.windows.net',
// If you're on Windows Azure, you will need this:
options:
{
database: 'your DB',
encrypt: true
}
};
var connection = new Connection(config);
connection.on('connect', function(err) {
if (err) {
context.log(err);
context.res = {
status: 500,
body: "Unable to establish a connection."
};
context.done();
} else {
executeStatement();
}
});
function executeStatement() {
request = new Request("select 42, 'hello world'", function(err, rowCount) {
if (err) {
context.log(err);
context.res = {
status: 500,
body: "Failed to connect to execute statement."
};
context.done();
} else {
context.log(rowCount + ' rows');
}
});
request.on('row', function(columns) {
columns.forEach(function(column) {
context.log(column.value);
});
context.done();
});
connection.execSql(request);
}
};
For more information, see Azure Functions JavaScript developer guide.