sequence id increment with date - laravel - php

Question

I'm trying to create an increment number licence with the current date of the year + an increment number but i really don't know how to do this i know MYSQl does not support sequences but i would like to know if there is a way to solve the problem
here my controller
public function create(){
$licence = new Licence ;
$licence ->num_licence = Carbon::now()->year -- i would like here to put the current year like 2017 with a random unique number to get the format like 20170001 for exemple !
...
how to acheice this? thanks in advance :)

Answer 1

you can use uniqid function with current year as prefix.
public function create(){
$licence = new Licence ;
$num_liscence_exist=true;
while($num_liscence_exist){
$num_liscence=uniqid(Carbon::now()->year);
if (!Liscence_Table::where('num_liscence', '=',"'".$num_liscence."'")->exists()) {
$liscence->num_liscence=$num_liscence;
$num_liscence_exist=false;
}
}
}

Answer 2

Generate the random id using uniqid() and concatenate with date:
public function create(){
$liscence=new Liscence();
$year = Carbon::now()->year;
$liscence->num_liscence= $year. uniqid();
$liscence->save();
}

Answer 3

using uniqid() get unique number or also you can use time stamp with it:
$liscence=new Liscence();
$year = Carbon::now()->year;
$liscence->num_liscence= $year. strtoupper(uniqid()) . Carbon::now()->timestamp;
$liscence->save();
Will look like : 2017ABC011486543961

Answer 4

A sequence needs to be stored somewhere so I doubt there's a sensible pure-PHP solution. But since you're already using MySQL there's no reason to not use it. I'd create a database table for that, something like:
CREATE TABLE licence_sequence (
sequence_year YEAR NOT NULL,
next_value INT UNSIGNED NOT NULL DEFAULT 1,
PRIMARY KEY (sequence_year, next_value)
)
ENGINE=InnoDB;
(Ugly sequence_year name was chosen to avoid having to quote it every time.)
You then have to manage this from code, including:
Ensuring you have rows for every year as you need them (this can be as simple as populating data for all years for next century).
Ensuring you don't assign the same value to different items.
A rough overview of stuff to consider:
You can (and should) make your licence number a unique index to avoid dupes.
You can use transactions to avoid unnecessary gaps. Transaction should wrap all the operations involved:
Get next sequence number
Save it into new licence
Increment next number
You need to ensure atomic operations in a multi-tasking environment. This is the hardest part. I've been lately being playing with MySQL named locks and they seem to work correctly.