我想上传一个pdf文件到mysql使用laravel

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=your_database
DB_USERNAME=your_username
DB_PASSWORD=your_password

php artisan make:migration create_pdfs_table --create=pdfs

<?php

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

class CreatePdfsTable extends Migration
{
    public function up()
    {
        Schema::create('pdfs', function (Blueprint $table) {
            $table->id();
            $table->string('filename');
            $table->string('path');
            $table->timestamps();
        });
    }

    public function down()
    {
        Schema::dropIfExists('pdfs');
    }
}

<form action="/upload" method="POST" enctype="multipart/form-data">
    @csrf
    <input type="file" name="pdf_file">
    <button type="submit">上传</button>
</form>

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class UploadController extends Controller
{
    public function upload(Request $request)
    {
        if ($request->hasFile('pdf_file')) {
            $file = $request->file('pdf_file');
            $path = $file->store('pdfs');
            
            // 将文件信息保存到数据库
            $pdf = new \App\Models\Pdf;
            $pdf->filename = $file->getClientOriginalName();
            $pdf->path = $path;
            $pdf->save();
            
            return '文件上传成功！';
        }
        
        return '未选择文件！';
    }
}

<?php

use Illuminate\Support\Facades\Route;

Route::post('/upload', 'UploadController@upload');