1: Process the order
public function oneSecondSnap()
{
$user_id = 1;
$goods_id = 1;
$number = 1;
$sql = "select count as number from food where id ='$goods_id' ";//Unlock the data of goods_id='$goods_id' and sku_id='$sku_id' in the ih_store data at this time is locked (Note 3), Other transactions must wait for this transaction to commit before executing
$row = DB::select($sql);
if ($row[0]->number > 0) {//High concurrency will lead to oversold
$order_sn = $this->build_order_no();
//Generate orders
$sql = "insert into orders(user_id,food_id,order_id)
values('$user_id','$goods_id','$order_sn')";
$order_rs = DB::insert($sql);
// stock reduction
$sql = "update food set count = count - " . $number . " where id = '$goods_id'";
$store_rs = DB::update($sql);
Log::info('Inventory reduction succeeded');
} else {
Log::info('Not enough stock');
}
}
/**
* Generate unique order
*/
public function build_order_no()
{
return date('ymd') . substr(implode(NULL, array_map('ord', str_split(substr(uniqid(), 7, 13), 1))), 0, 8);
}
2: Use jmeter to open multi-threaded access test
For specific operations, please check https://blog.csdn.net/qq_29099209/article/details/79998731
3: View analysis results
Set the product to 10 and initiate 20 threads to request the purchase in 0.1 seconds, and found that the product was oversold
4: Solutions
https://blog.csdn.net/nuli888/article/details/51865401