Node JS Synchronous database call - node.js

Question

I have a problem using Node JS when making synchronous calls.. Here's my problem:
I have the following code:
async.doWhilst(function(callback) {
//some code
callback();
}, function() {
//make a database call and based on the results I should
//return true to continue looping or false to stop here
}, function(err) {
//do some things when the loop finishes
})
The problem is when calling the database it is asynchronous call and the loop continues before even returning the proper value.
Thank you alot for your comments, I have solved the problem by move the database call to the loop code like this:
var results = []
async.doWhilst(function(callback) {
//some code
sequelize.query('some query').success(function(result) {
results = result;
callback();
});
}, function() {
//use the results variable that is fetched from the database
//return true to continue looping or false to stop here
}, function(err) {
//do some things when the loop finishes
})

Answer 1

You can have Sequelize return once the data has actually returned using this method:
return sequelize
.query("Database query here")
.success(function(result) {
//Do something with result here
else {
//Return error
}
});

Answer 2

Hope the following can help:
(function iterate() {
executeDatabaseCall(..., function(e,r) {
if (...conditions to continue looping are verified...)
iterate();
else
...manage the end of loop...
});
})();

Answer 3

If you really want to use sync call, you can use this library :
https://github.com/luciotato/waitfor
It'll permit you to make sync call using :
var syncDataReceived = wait.forMethod(collection,'insert',{data:toinsert});

Answer 4

I have solved the problem by move the database call to the loop code like this:
var results = []
async.doWhilst(function(callback) {
//some code
sequelize.query('some query').success(function(result) {
results = result;
callback();
});
}, function() {
//use the results variable that is fetched from the database
//return true to continue looping or false to stop here
}, function(err) {
//do some things when the loop finishes
})