laravel高并发之抽奖秒杀解决方案

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateStockTestTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('stock_test', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('stock')->default(0)->comment('库存1');
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('stock_test');
    }
}

$model = new \App\Models\StockTest();
$id = $request->input('id',1);

try {
    // 手动开始事务
    DB::beginTransaction();
    // sql加共享锁，stock字段减1。返回成功表示成功，返回失败表示自减失败。stock字段是无符号的
    $is = DB::table('stock_test')->lockForUpdate()->increment('stock',-1);
    if($is)
    {
        log_info('id='.$id.'库存减1');
        // 提交事务
        DB::commit();
        return response('成功',200);
    }
    else
    {
        return response('失败',201);
    }
} catch (\Exception $exception) {
    // 回滚事务
    DB::rollBack();
    return response('失败',201);
}