angelorigo's avatar

How to use DB::connection()->enableQueryLog();

Hi,

I try to use DB::connection()->enableQueryLog();

I need to see the query that eloquent creates, but the error message was "cannot be resolved to a type".

Do i need import some class ? how can i enable query logs ?

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4 replies
LaryAI's avatar
Level 58

To enable query logging in Laravel using DB::connection()->enableQueryLog();, you need to ensure that you are using the correct namespace and methods. Here's a step-by-step guide to help you achieve this:

  1. Import the DB Facade: Make sure you have imported the DB facade at the top of your PHP file. This is necessary to use the DB class methods.

  2. Enable Query Logging: Use the enableQueryLog() method to start logging queries.

  3. Retrieve the Query Log: After executing your queries, you can retrieve the log using getQueryLog().

Here's an example of how you can implement this:

<?php

use Illuminate\Support\Facades\DB;

// Enable query logging
DB::connection()->enableQueryLog();

// Execute your queries
$users = DB::table('users')->get();

// Retrieve the query log
$queryLog = DB::getQueryLog();

// Output the query log
dd($queryLog);

Explanation:

  • Importing the DB Facade: The use Illuminate\Support\Facades\DB; line ensures that you can use the DB facade in your file.

  • Enabling Query Logging: DB::connection()->enableQueryLog(); starts the logging of all queries that are executed.

  • Executing Queries: You can perform any database operations after enabling the query log.

  • Retrieving the Query Log: DB::getQueryLog(); returns an array of all the queries that have been executed since the logging was enabled.

  • Outputting the Log: dd($queryLog); is used to dump and die, which will output the query log to the screen for inspection.

Make sure your application is in a development environment when using query logging, as it can have performance implications in a production environment.

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angelorigo's avatar

Hi @Sinnbeck ,

At composer.json there is a line with : "barryvdh/laravel-debugbar" : "^2.4", at require-dev section, also the APP_DEBUG is set to true into the .env.dev file.

Following the docs i run php artisan vendor:publish --provider="Barryvdh\Debugbar\ServiceProvider".

How can i check if Debugbar is already installed ? and how to use ? i try : Debugbar::info($solicitacao); and the message was : "message": "Class 'App\Services\Debugbar' not found",

Sinnbeck's avatar

@angelorigo No need to call anything manually. If you are unsure if its installed just run composer update, to have composer install everything again. And if APP_DEBUG is set to true, the bar will show up on any blade page automatically (red square in the lower right corner)

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