Is it possible for Node.js to execute individual database operations within a single function atomically?

As I delve into writing database queries that operate on node js, a puzzling thought has been lingering in my mind. There seems to be a misunderstanding causing confusion.

If node is operating in a single-threaded capacity, then it follows that all function calls will execute consecutively. Despite this, if multiple clients are accessing the same node server, there will still exist a race condition determining which requests get queued first. However, given that each request is processed sequentially, does this imply that all database operations carried out are atomic within a singular request?

For instance, consider wanting to 1) tally the number of columns matching a specific value in a table and 2) insert a new row if the count exceeds 10. (Although feasible in one SQL query, let's assume they are executed separately for illustration purposes. It may seem simplistic, yet serves its purpose.) Utilizing a transaction ensures accuracy by preventing unexpected changes in column counts. Now, contemplating crafting a function executing both queries without a transaction - would this setup guarantee functioning as intended in the node environment?

javascriptdatabasenode.jstransactions

Answer №1

It appears that your goal is to initiate a count as your initial call, followed by inserting data in the callback of this first call.

Due to the asynchronous nature of JavaScript and node.js, once you have initiated the count and are awaiting a response, other operations can take place concurrently. This means that another insert operation triggered by a different user request could be processed before the one tied to the initial count.

In some scenarios, this can lead to incorrect assumptions about the dataset size when working with inserts linked to specific calls. However, understanding this behavior will help clarify any uncertainties you may have.

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