How to query database in flask app using url parameters

I have my flask app and I am able to query the database in a view named 'blog.blade.php', but now to I want to transfer my control from this view to another view called 'viewblog.blade.php' and now I want to query the database in this view using url parameters that I am sending form first view. My problem is, I am getting an error in viewblog.php file.

blog.blade.php

  @foreach($blogs as $blog)

  <div class="col-md-6" style="padding: 25px;">
        <div class="card" style="border: 0;">
            <div class="card-body">
              <h3 class="card-title"><a href="viewblog?blog_id=" target="_blank"></a></h3>
              <p></p>
              <a href="viewblog?blog_id=" class="btn btn-outline-danger" target="_blank">Continue reading...</a>
            </div>
        </div>
    </div>

@endforeach
 </div>

viewblog.blade.php

<div class="row" style="padding: 20px;">
                        
      
     </div>

BlogController.php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use Illuminate\Support\Facades\DB;

use App\Blog;

class BlogController extends Controller

{

    function getBlogs(){
        $blogs =  Blog::All();
        return view("blogs",['blogs'=>$blogs]);
    }

    function viewBlog(Request $req){
        $bid = $req->blog_id;
        $blogs = Blog::select('select * from blogs where id = ' . $bid);
        return view("viewblog",['blogs'=>$blogs]);
    }
}

Blog.php (Blog modal)

namespace App;

use Illuminate\Database\Eloquent\Model;

class Blog extends Model
{
    //
}

source https://stackoverflow.com/questions/69293552/how-to-query-database-in-flask-app-using-url-parameters