在 mysql - laravel 中删除后保持发票顺序

Question

Whenever a user is inserting an invoice on our laravel app, it numbers the respective invoice. so if they enter the first invoice ever, then it will be invoice 1, second invoice will be invoice 2 and so on

The number (1, 2, 3, ..., x) is basically the id (which is the primary key of the invoices table). But now let's say that there are 30 invoices and he wants to delete the 25th one, the next one that will be inserted won't be number 25, it will be 31, because it creates a new record in the table, and it should be 25 because that's the one that's missing

My question is, how can I automatically set the next number of the invoice to be the first one that's missing? I have a feeling that I should create a new column which indicates the number of the invoice. This is the code that's creating the invoice:

        $invoice = new \App\Models\Invoice();
        $invoice->provider_id = $request->input('provider-select');
        $invoice->number = $request->input('document-number');
        $invoice->document_date = $request->input('document-date');
        $invoice->due_date = $request->input('due-date');
        $invoice->discount_procent = $request->input('discount-procent');
        $invoice->discount_value = $request->input('discount-value');
        $invoice->total = $request->input('total-value');
        $invoice->insertion_date = $request->input('insertion-date');
        $invoice->save();

Should I create a new column called numbering and assign each invoice a number in ascending order, and when one invoices gets delete, to detected the one that's missing and then assign the next invoice with the number and filter them by numerotate and not by id ?

Answer 1

Yes,rather you should make a new field. You should not touch the primary key handling.

You can make a new field,let's say sequence . Before inserting the new data check the missing sequence in invoice table and assign it to that sequence.

EDIT - If you want to generate year wise sequence, you need to maintain a year column and for retrieve records use both sequence and year column.