Detailed solution: Use laravel to solve the inventory overflow problem

The following tutorial column of laravel will introduce to you several solutions to using laravel to solve inventory overflow. I hope it will be helpful to friends in need!

                                                                                                               

Database fields

1. Error demonstration

    /**
     * 错误示范
     * Create by Peter Yang
     * 2021-06-08 10:57:59
     * @return string
     */
    function test1()
    {

        //商品id
        $id = request()->input('id');

        $product = Product::where('id', $id)->firstOrFail();

        if ($product->num decrement('num');

        return "success";

    }

Use go to simulate concurrency

package mainimport (
    "fmt"
    "github.com/PeterYangs/tools/http"
    "sync")func main() {

    client := http.Client()

    wait := sync.WaitGroup{}

    for i := 0; i <p>View inventory in the database</p><p><img src="/static/imghwm/default1.png" data-src="https://img.php.cn/upload/article/000/000/020/b3a44af246aab48e87b85467ea9f1568-1.png?x-oss-process=image/resize,p_40" class="lazy" alt="Detailed solution: Use laravel to solve the inventory overflow problem"><br><strong>The inventory has exceeded</strong></p><h2>
<span class="header-link octicon octicon-link">##2.redis atomic lock</span><pre class="brush:php;toolbar:false">    /**
     * redis原子锁
     * Create by Peter Yang
     * 2021-06-08 11:00:31
     */
    function test2()
    {
        //商品id
        $id = request()->input('id');

        $lock = \Cache::lock("product_" . $id, 10);

        try {

            //最多等待5秒，5秒后未获取到锁，则抛出异常
            $lock->block(5);

            $product = Product::where('id', $id)->firstOrFail();

            if ($product->num decrement('num');

            return 'success';

        }catch (LockTimeoutException $e) {

            return '当前人数过多';

        } finally {

            optional($lock)->release();
        }
    }

Stock is normal

##3.mysql pessimistic lock

    /**
     * mysql悲观锁
     * Create by Peter Yang
     * 2021-06-08 11:00:47
     */
    function test3()
    {

        //商品id
        $id = request()->input('id');

        try {
            \DB::beginTransaction();
            $product = Product::where('id', $id)->lockForUpdate()->first();

            if ($product->num decrement('num');

            \DB::commit();

            return "success";

        } catch (\Exception $exception) {

        }

    }

Stock is normal

##4.mysql optimistic lock

    /**
     * mysql乐观锁
     * Create by Peter Yang
     * 2021-06-08 11:00:47
     */
    function test4()
    {

        //商品id
        $id = request()->input('id');

        $product = Product::where('id', $id)->first();

        if ($product->num num]);

        if (!$res) {

            return '当前人数过多';

        }

        return 'success';


    }

Inventory normal

Optimize optimistic lock

Modify the inventory sql to

\DB::update('UPDATE `product` SET num = num -1 WHERE id = ? AND num-1 >= 0', [$id]);

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