MySQL user-defined variables in Node.js mysql module - mysql

Question

I was wondering whether MySQL user-defined variables will work using Node.js mysql module. The example below highlight exactly what I want to achieve using a transaction:
connection.beginTransaction(err => {
if (err) { throw err; }
connection.query('INSERT INTO user SET = ?', {id: 12, username: 'name'}, (err, results) => {
if (err) {
return connection.rollback(function() {
throw error;
});
}
connection.query('SELECT #user_id:=userID FROM user WHERE username = ?', ['name'], (err, results) => {
if (err) {
return connection.rollback(function() {
throw error;
});
}
connection.query('INSERT INTO authentication SET `userID` = #user_id, ?', {password: 'userpassword'}, (err, results) => {
if (err) {
return connection.rollback(function() {
throw error;
});
}
connection.commit(err => {
if (err) {
return connection.rollback(function() {
throw err;
});
}
console.log('success!');
});
});
});
});
});
You might be wondering, why not use the result of the second query in the third query. The transaction function is wrapped inside a utility function that accepts queries as an argument to be executed using transaction.
If the above code sample doesn't work, please is there a concise way to achieve this. Thank you.

Answer 1

After running the code sample it failed not because of MySQL variable in the second query. This code sample is what works for me:
connection.beginTransaction(err => {
if (err) { throw err; }
connection.query('INSERT INTO user (id, username) VALUES(?, ?)', [12, 'name'], (err, results) => {
if (err) {
return connection.rollback(function() {
throw error;
});
}
connection.query('SELECT #user_id:=userID FROM user WHERE username = ?', ['name'], (err, results) => {
if (err) {
return connection.rollback(function() {
throw error;
});
}
connection.query('INSERT INTO authentication (id, password) VALUES (#user_id, ?), ['userpassword'], (err, results) => {
if (err) {
return connection.rollback(function() {
throw error;
});
}
connection.commit(err => {
if (err) {
return connection.rollback(function() {
throw err;
});
}
console.log('success!');
});
});
});
});
});