修改app/Providers/AppServiceProvider.php

use Illuminate\Support\Facades\DB;

public function boot()
{
    DB::listen(

        function ($sql) {
            // $sql is an object with the properties:
            //  sql: The query
            //  bindings: the sql query variables
            //  time: The execution time for the query
            //  connectionName: The name of the connection

            // To save the executed queries to file:
            // Process the sql and the bindings:
            foreach ($sql->bindings as $i => $binding) {
                if ($binding instanceof \DateTime) {
                    $sql->bindings[$i] = $binding->format('\'Y-m-d H:i:s\'');
                } else {
                    if (is_string($binding)) {
                        $sql->bindings[$i] = "'{$binding}'";
                    }
                }
            }
            // Insert bindings into query
            $query = str_replace(array('%', '?'), array('%%', '%s'), $sql->sql);
            $query = vsprintf($query, $sql->bindings);

            //print_r($query);
        }
    );

}