How to query azure SQL from node.js server - node.js

Question

I'm having some trouble with querying my DB on azure sql (I am very new to sql). I'm following the steps on https://learn.microsoft.com/en-us/azure/sql-database/sql-database-connect-query-nodejs, but it only includes tutorial steps on how to read tables, not manipulate them. I am trying to do INSERT and DELETE requests on my Node.js server, but I am getting a request error in one of the node modules, which makes me think that I'm going about requesting the operations wrong.
Here's some code:
var Connection = require('tedious').Connection;
var Request = require('tedious').Request;
// Create connection to database
var config =
{
userName: 'user_name',
password: 'password',
server: 'server_name',
options:
{
database: '_dbname'
, encrypt: true
}
}
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();
}
}
//this works fine, it's for initially loading the data from the database
function queryDatabase() {
console.log('\nReading rows from the Table...');
let obj = {};
let objs = [];
let request;
// Read all rows from table
request = new Request(
"SELECT * FROM [dbo].[TABLE_NAME]",
function (err, rowCount, rows) {
console.log('-- Done');
}
);
//this is for when an admin adds content to the app, SQL table not changing,
//node.js throws error
socket.on('add item', item => {
let index = getCollectionIndexById(item.id);
collections[index].items.push(item.item);
io.sockets.emit('add item', item);
request = new Request(`INSERT INTO [dbo].[TABLE_NAME](Id, attr1, attr2, attr3, attr4)
VALUES (`
+ item.id + ','
+ item.item.attr2 + ','
+ item.item.attr3 + ','
+ item.item.attr4 + ','
+ null, function (err, rowCount, rows) {
if (err) throw err;
console.log('> requested db to insert item');
});
connection.execSql(request);
console.log('> item sent to app');
});
//for when the admin removes content from the app, same error
socket.on('rm item', item => {
collections[getCollectionIndexById(item.id)].items.splice(item.index, 1);
io.sockets.emit('rm item', { "id": item.id, index: item.index });
request = new Request(`DELETE FROM [dbo].[TABLE_NAME] WHERE Id= `
+ item.id + ` AND attr1= ` + item.item.attr1, function (err, rowCount, rows) {
if (err) throw err;
console.log('> requested db to remove item')
});
connection.execSql(request);
console.log('> sent request to remove item');
});
The exact error msg is RequestError: Incorrect syntax near 'esse'., and its in one of the node modules called tedious in request.js.
So in summary, if anyone knows of a way to query Azure SQL Db's to make inserts and deletes, any help is appreciated!

Answer 1

You missed ) in the 'insert' SQL. Also, you'd need to set string value with single quotes of course.
Change the following lines of code
request = new Request(`INSERT INTO [dbo].[TABLE_NAME](Id, attr1, attr2, attr3, attr4)
VALUES (`
+ item.id + ','
+ item.item.attr2 + ','
+ item.item.attr3 + ','
+ item.item.attr4 + ','
+ null, function (err, rowCount, rows) {
if (err) throw err;
console.log('> requested db to insert item');
});
connection.execSql(request);
to
request = new Request(`INSERT INTO [dbo].[TABLE_NAME](Id, attr1, attr2, attr3, attr4) VALUES ('${item.id}', '${item.item.attr2}', '${item.item.attr3}', '${item.item.attr4}' null)`, function (err, rowCount, rows) {
if (err) throw err;
console.log('> requested db to insert item');
});
connection.execSql(request);

Answer 2

You will find an example here of how to INSERT records on a table using NodeJs and queryRaw.
conn.queryRaw("INSERT SalesLT.Product (Name, ProductNumber, StandardCost, ListPrice, SellStartDate) OUTPUT INSERTED.ProductID VALUES ('SQL Server Express 102', 'SQLEXPRESS 102', 0, 0, CURRENT_TIMESTAMP)", function (err, results)
You can use queryRaw also to DELETE records on a table.
Hope this helps.