Laravel welsprekend - Is er een manier om Hint toe te voegen vóór SELECT?

U kunt de klasse PostgresConnection en de klasse PostgresGrammar overschrijven om uw eigen logica toe te voegen aan de methode compileSelect in de klasse PostgresGrammar.

class PostgresConnection extends \Illuminate\Database\PostgresConnection
{
    /**
     * @return \Illuminate\Database\Grammar|\Illuminate\Database\Query\Grammars\PostgresGrammar
     */
    protected function getDefaultQueryGrammar()
    {
        return $this->withTablePrefix(new PostgresGrammar());
    }
}

class PostgresGrammar extends \Illuminate\Database\Query\Grammars\PostgresGrammar
{
    /**
     * Compile a select query into SQL.
     *
     * @param  \Illuminate\Database\Query\Builder $query
     *
     * @return string
     */
    public function compileSelect(Builder $query)
    {
        $sql = parent::compileSelect($query);
        return '/*+ IndexScan(users) */' . $sql;
    }
}

Als u een serviceproviderklasse moet definiëren, is het erg belangrijk om deze serviceprovider te registreren vóór Illuminate\Database\DatabaseServiceProvider::class

class DatabasePostgresServiceProvider extends ServiceProvider
{
    /**
     * 此外，在 Illuminate\Database\DatabaseServiceProvider::class 之前注册此服务提供程序非常重要
     *
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        Connection::resolverFor('postgres', function ($connection, $database, $prefix, $config) {
            // Use your own defined PostgresConnection class here.
            return new PostgresConnection($connection, $database, $prefix, $config);
        });
    }
}

Geconfigureerd in config/app.php

'providers' => [
        // .... 
        DatabasePostgresServiceProvider::class,
        Illuminate\Database\DatabaseServiceProvider::class,

    ],