Calling Azure SQL from Azure Functions node.js - azure

Question

I'm trying to use tedious library to inject simple insert from the incoming body. No error is thrown, but context.logs placed inside the functions are not displaying in logs. As a result in DB I have row with NULL values instead of what is passed. Any idea what am I doing wrong?
Is there any other library/method of accessing the Azure DB from Azure Functions or I am stuck with Tedious?
Of course I could probably use Azure Logic App but its more expensive to run than Azure Functions.
var Connection = require('tedious').Connection;
var Request = require('tedious').Request;
var TYPES = require('tedious').TYPES;
var globalheaders = {
Id: '1233',
Name: 'Ant',
Payment: "2019-10-09",
Type: 'Fixed cost',
Value: 156,
Cycle: '1',
Frequency: 'month'
}
module.exports = async function (context, req) {
context.log('JavaScript HTTP trigger function processed a request.');
globalheaders = req.body;
context.log(globalheaders);
var config = {
server: '********.database.windows.net', //update me
authentication: {
type: 'default',
options: {
userName: '*******', //update me
password: '*******' //update me
}
},
options: {
// If you are on Microsoft Azure, you need encryption:
encrypt: true,
database: 'cashmandb' //update me
}
};
var connection = new Connection(config);
await connection.on('connect', function(err) {
if (err) {
context.log(err);
context.res = {
status: 500,
body: "Unable to establish a connection."
};
context.done();
} else {
context.log('before execution');
executeStatement();
}
});
context.log('connection executed')
async function executeStatement() {
request = new Request("INSERT dbo.cost (Id, Name, Payment, Type, Value, Cycle, Frequency) OUTPUT INSERTED.Id VALUES (#Id, #Name, #Payment, #Type, #Value, #Cycle, #Frequency);", function(err) {
if (err) {
context.log(err);}
});
context.log('executestatement')
request.addParameter('Id', TYPES.NChar,globalheaders.id);
request.addParameter('Name', TYPES.NVarChar , globalheaders.name);
request.addParameter('Payment', TYPES.Date, globalheaders.payment);
request.addParameter('Type', TYPES.NVarChar,globalheaders.type);
request.addParameter('Value', TYPES.Int,globalheaders.value);
request.addParameter('Cycle', TYPES.NChar,globalheaders.cycle);
request.addParameter('Frequency', TYPES.NChar,globalheaders.frequency);
request.on('row', function(columns) {
columns.forEach(function(column) {
if (column.value === null) {
context.log('NULL');
} else {
context.log("Product id of inserted item is " + column.value);
}
});
});
await connection.execSql(request);
}
context.done();
};

Answer 1

Try this :
var Connection = require('tedious').Connection;
var Request = require('tedious').Request;
var TYPES = require('tedious').TYPES;
module.exports = async function (context, req) {
context.log('JavaScript HTTP trigger function processed a request.');
var config = {
server: 'xxxx.database.windows.net', //update me
authentication: {
type: 'default',
options: {
userName: 'xxx', //update me
password: 'xxx' //update me
}
},
options: {
// If you are on Microsoft Azure, you need encryption:
encrypt: true,
database: 'xxx' //update me
}
};
var connection = new Connection(config);
await connection.on('connect', function(err) {
if (err) {
context.log(err);
context.res = {
status: 500,
body: "Unable to establish a connection."
};
context.done();
} else {
executeStatement(req.body);
}
});
async function executeStatement(globalheaders) {
request = new Request("INSERT dbo.cost (Id, Name, Payment, Type, Value, Cycle, Frequency) OUTPUT INSERTED.Id VALUES (#Id, #Name, #Payment, #Type, #Value, #Cycle, #Frequency);", function(err) {
if (err) {
context.log(err);}
});
request.addParameter('Id', TYPES.NChar,globalheaders.Id);
request.addParameter('Name', TYPES.NVarChar , globalheaders.Name);
request.addParameter('Payment', TYPES.Date,globalheaders.Payment);
request.addParameter('Type', TYPES.NVarChar,globalheaders.Type);
request.addParameter('Value', TYPES.Int,globalheaders.Value);
request.addParameter('Cycle', TYPES.NChar,globalheaders.Cycle);
request.addParameter('Frequency', TYPES.NChar,globalheaders.Frequency);
request.on('row', function(columns) {
columns.forEach(function(column) {
if (column.value === null) {
context.log('NULL');
} else {
context.log("Product id of inserted item is " + column.value);
}
});
});
await connection.execSql(request);
}
context.done();
};
Test result on local :
Data has been insetted into Azure SQL DB successfully:

Answer 2

I believe the problem here is that you are mixing async/await and context.done(). You should just use 1 of the 2 as required.
Also, I believe tedious doesn't support async/await in the first place. So, removing the that and just having context.done() should do.

Answer 3

After long battle it appears that for some reason Azure Functions prefers adressing the property by value string:
request.addParameter('Id', TYPES.NChar,globalheaders['Id']);
request.addParameter('Name', TYPES.NVarChar , globalheaders['Name']);
request.addParameter('Payment', TYPES.Date, globalheaders['Payment']);
request.addParameter('Type', TYPES.NVarChar,globalheaders['Type']);
request.addParameter('Value', TYPES.Int,globalheaders['Value']);
request.addParameter('Cycle', TYPES.NChar,globalheaders['Cycle']);
request.addParameter('Frequency', TYPES.NChar,globalheaders['Frequency']);
After changing to this everything started to work

Answer 4

The correct way to achieve it is by using sync code. Tedious uses event based programming paradigm and do not support async programming paradigms. So to explicitly mark the completion of azure function we use context.done() method. So the right code would be as follows:
var Connection = require('tedious').Connection;
var Request = require('tedious').Request;
var TYPES = require('tedious').TYPES;
module.exports = function (context, req) {
context.log('JavaScript HTTP trigger function processed a request.');
var config = {
server: 'xxxx.database.windows.net', //update me
authentication: {
type: 'default',
options: {
userName: 'xxx', //update me
password: 'xxx' //update me
}
},
options: {
// If you are on Microsoft Azure, you need encryption:
encrypt: true,
database: 'xxx' //update me
}
};
var connection = new Connection(config);
connection.connect();
connection.on('connect', function(err) {
if (err) {
context.res = {
status: 500,
body: "Unable to establish a connection."
};
context.done();
} else {
executeStatement(req.body);
}
});
function executeStatement(globalheaders) {
request = new Request("INSERT dbo.cost (Id, Name, Payment, Type, Value, Cycle, Frequency) OUTPUT INSERTED.Id VALUES (#Id, #Name, #Payment, #Type, #Value, #Cycle, #Frequency);", function(err) {
if (err) {
context.log(err);}
});
request.addParameter('Id', TYPES.NChar,globalheaders.Id);
request.addParameter('Name', TYPES.NVarChar , globalheaders.Name);
request.addParameter('Payment', TYPES.Date,globalheaders.Payment);
request.addParameter('Type', TYPES.NVarChar,globalheaders.Type);
request.addParameter('Value', TYPES.Int,globalheaders.Value);
request.addParameter('Cycle', TYPES.NChar,globalheaders.Cycle);
request.addParameter('Frequency', TYPES.NChar,globalheaders.Frequency);
request.on('row', function(columns) {
columns.forEach(function(column) {
if (column.value === null) {
context.log('NULL');
} else {
context.log("Product id of inserted item is " + column.value);
}
});
});
request.on("requestCompleted", function (rowCount, more) {
connection.close();
context.res = {
status: 200, /* Defaults to 200 */
body: JSON.stringify(result),
headers: {
' Content-Type': 'application/json'
}
};
context.done();
});
connection.execSql(request);
}
};