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Detailed solution: Use laravel to solve the inventory overflow problem
- 藏色散人forward
- 2021-06-08 15:15:122499browse
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="https://img.php.cn/upload/article/000/000/020/b3a44af246aab48e87b85467ea9f1568-1.png" 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
/**
* 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]);The above is the detailed content of Detailed solution: Use laravel to solve the inventory overflow problem. For more information, please follow other related articles on the PHP Chinese website!
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