Laravel Multiple Unions

Question

I\'m having an issue adding a query with multiple Unions the \"laravel way\".

The I am trying to accomplish a query equivalent to the one generated by the following:

Answer 1

Your unionAll calls are indeed getting nested. One solution is to create a subquery in the for loop, and then unionAll that subquery to the main query after it's been defined. Then you run get on the whole shebang when you're done, like so:

$ips_list = DB::table('ips')->where('network', '=', '1')->where('used', '=', '0')->limit(5);

for($n = 1; $n < $total_networks; $n++){
    $ip_list_subquery = DB::table('ips')
             ->where('network', '=', $n)
             ->where('used', '=', '0')
             ->limit(5);
    $ips_list = $ips_list->unionAll($ip_list_subquery);
}
$ips = $ips_list->get();

So, effectively, you're chaining the unionAll calls:

$a->unionAll($b)->unionAll($c)->unionAll($d)...

rather than nesting them:

$a->unionAll($b->unionAll($c->unionAll($d...))))

Answer 2

That works but it's too much. You can just use DB::select("ANY RAW Query");

Answer 3

// Use PDO . It is the simplest answer I found after two days of struggling for using complex UNION in Laravel

 $PDO = DB::connection('mysql')->getPdo();

 $billingStmt = $PDO->prepare("

 select * from (SELECT   * 
 FROM     t_statements 
 WHERE    reference_id = $user_id 
 AND      service_provider='FOLDER' 
 AND      bill_name IS NOT NULL 
 ORDER BY bill_name ASC ) AS a 

 UNION ALL 

 SELECT * 
 FROM   ( 
 SELECT   * 
 FROM     t_statements 
 WHERE    reference_id = $user_id 
 AND      service_provider !='FOLDER' 
 AND      bill_name IS NOT NULL 
 ORDER BY (CASE WHEN is_paid = 0 THEN due_date ELSE is_paid END) DESC) b

     ");



        $billingStmt->execute();
        $usersBills = $billingStmt->fetchAll((\PDO::FETCH_ASSOC));
        header('Content-Type: application/json');
        $androidUserBills = json_encode($usersBills); // return results as json 

    return response($androidUserBills);

// JSON response

       [
             {
                  "id": "247",
                  "created_at": "2016-02-23 10:44:33",
                  "updated_at": "2016-02-23 16:58:57",
                  "t_user_account_id": "245",
                  "statement_date": null,
                  "due_date": "0000-00-00 00:00:00",
                  "amount": "0",
                  "is_paid": "0",
                  "is_reminded": "1",
                  "overdue": null,
                  "current_amount": null,
                  "bill_total": "88.5",
                  "bill_id": "zd91NwGU",
                  "bill_name": "Utility",
                  "predecessor": null,
                  "reference_id": "120",
                  "service_provider": "FOLDER",
                  "sp_id": null
                   },

             {
                  "id": "252",
                  "created_at": "2016-02-23 16:29:50",
                  "updated_at": "2016-02-23 16:58:25",
                  "t_user_account_id": "250",
                  "statement_date": null,
                  "due_date": "2016-03-04 17:52:34",
                  "amount": "0",
                  "is_paid": "0",
                  "is_reminded": "1",
                  "overdue": null,
                  "current_amount": null,
                  "bill_total": "88.5",
                  "bill_id": "Lojnc",
                  "bill_name": "Water bill",
                  "predecessor": null,
                  "reference_id": "120",
                  "service_provider": "IWK",
                  "sp_id": "7"
                    }

                    ]