为什么我的 DB::getQueryLog() 数组在 Laravel 5 中为空？

Empty DB::getQueryLog() Array in Laravel 5: Resolving the Issue

Laravel 5's query log is disabled by default, resulting in an empty array when calling DB::getQueryLog(). To rectify this issue, explicitly enable the query log using any of the following methods:

• Programmatically Enable Query Log:

  DB::enableQueryLog();
  print_r(DB::getQueryLog());

• Register Event Listener:

  DB::listen(
    function ($sql, $bindings, $time) {
        // Process and store query log data
    }
  );

Additional Tips:

• Multiple DB Connections:
  Enable and retrieve query logs for specific connections:

  DB::connection('my_connection')->enableQueryLog();
  print_r(
   DB::connection('my_connection')->getQueryLog()
  );

• Middleware Approach:
  Enable query logging in middleware's handle method and retrieve logs in the terminate method:

  class BeforeAnyDbQueryMiddleware
  {
    // Enable query logging before DB operations
    public function handle($request, Closure $next)
    {
        DB::enableQueryLog();
        return $next($request);
    }
  
    // Retrieve query log after DB operations
    public function terminate($request, $response)
    {
        dd(DB::getQueryLog());
    }
  }

• CLI Execution:
  Enable query logging in the artisan.start event:

  $app['events']->listen('artisan.start', function(){
    \DB::enableQueryLog();
  });

Memory Considerations:

Laravel stores query logs in memory. To avoid excessive memory usage:

• Enable query logging only for debugging.

• Use the following code to enable query logging only in the development environment:

  if (App::environment('local')) {
    // The environment is local
    DB::enableQueryLog();
  }

References:

• [Laravel Query Logging](https://laravel.com/docs/5.0/database#query-logging)

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