Why is My Laravel 5 Query Log Empty?

Mystery of the Empty Query Log in Laravel 5: DB::getQueryLog() Unveiled

When attempting to retrieve the query log using DB::getQueryLog(), developers may encounter an unexpected outcome: an empty array. This puzzling behavior stems from query logging being disabled in Laravel 5 by default.

Enabling Query Logging

To access the query log, you need to explicitly enable it:

• Calling DB::enableQueryLog(): This activates query logging for all DB connections.
• Registering an Event Listener: Register a listener to receive detailed information about each executed query.

Considerations

1. Multiple DB Connections: If your application uses multiple database connections, specify the connection to log, e.g., DB::connection('my_connection')->enableQueryLog().
2. Enabling Location: Determine the most appropriate location to enable query logging. For HTTP requests, consider middleware; for CLI commands, an artisan.start event listener.
3. Memory Consumption: Be mindful of potential memory consumption when storing queries in memory. For debugging purposes, consider enabling logging only in development environments.

Retrieving Query Log

Once enabled, you can retrieve the query log by calling DB::getQueryLog(). This returns an array containing the following data:

• SQL statement
• Bindings (if any)
• Execution time

Additional Resources

For further information, reference the Laravel documentation: https://laravel.com/docs/5.0/database#query-logging

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