Hi folks!
I'm working on a webshop prototype which makes use of mongodb for product
catalouge, users and orders, redis for sessions and mysql for the inventory.
I want to use mysql transactions to make sure that, if a order is placed,
the inventory stock is changed accordingly.
So started writing the code, messed around with it but was left behind with
one problem:
for (lineitem in lineitems) {
transaction.query("SELECT n from inventory WHERE productId = ?",
[lineitem], function (err, rows) {
if (err)
transaction.rollback();
var newN = rows[0].n - lineitems[lineitem].quantity;
if (newN >= 0) {
transaction.query("UPDATE inventory SET n = ? WHERE productId =
?", [newN, lineitem], function (err) {
if (err){
transaction.rollback();
console.log(err);
}
//here I want to commit if *all* updates were successfull!!!
});
}
})
}
As you can see I want to do a conditional update. If the number of items in
stock is bigger or equal to the number of items in the order, the number of
items in stock should be decreased accordingly. This two steps need to be
atomic. In addition, I want to do this conditional updates for all items in
the shopping cart. If it fails for one item, the whole transaction should
roll back.
I hope my problem has become clear and there is someone out there who could
help me ;)
Kind regards!
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