Convert to Laravel Query - laravel

Question

I have query for query data. That is document.
"SELECT
zk_z_hako * CASE WHEN zk_n_iri> 0 THEN zk_n_iri ELSE 1 END
+ zk_z_bara
- ifnull(
sum(
ns_hako
* CASE WHEN zk_n_iri> 0 THEN zk_n_iri ELSE 1 END
* CASE WHEN ns_tr_kbn in (0,6) OR ( ns_tr_kbn = 1 AND ns_ns_kbn = 7) THEN 1
WHEN ns_tr_kbn in (1,7) THEN (-1)
ELSE 0
END
+ ns_bara
* CASE WHEN ns_tr_kbn in (0,6) OR ( ns_tr_kbn = 1 AND ns_ns_kbn = 7) THEN 1
WHEN ns_tr_kbn in (1,7) THEN (-1)
ELSE 0
END )
,0 ) AS TOTAL_BARA
FROM t_table1
LEFT JOIN t_table2
ON ns_kno = zk_kno
AND ns_show_flg = 0
AND ns_ymd > 'Date param'
WHERE zk_kno = Value param;
So I am not a master of Laravel. Now I need to convert this query for work with laravel. Anyone can help me?
And i have to try this query.
$squery = 'zk_z_hako * CASE WHEN zk_n_iri> 0 THEN zk_n_iri ELSE 1 END
+ zk_z_bara
ifnull(
sum(
ns_hako
* CASE WHEN zk_n_iri> 0 THEN zk_n_iri ELSE 1 END
* CASE WHEN ns_tr_kbn in (0,6) OR ( ns_tr_kbn = 1 AND ns_ns_kbn = 7) THEN 1
WHEN ns_tr_kbn in (1,7) THEN (-1)
ELSE 0
END
+ ns_bara
* CASE WHEN ns_tr_kbn in (0,6) OR ( ns_tr_kbn = 1 AND ns_ns_kbn = 7) THEN 1
WHEN ns_tr_kbn in (1,7) THEN (-1)
ELSE 0
END )
,0 ) AS TOTAL_BARA ';
$param1= '20160310';
$param2= '1972640100';
$results = DB::table('table1')
->select($squery)
->leftJoin('table2', function($join) use ($param1)
{
$join->on('table1.ns_kno', '=', 'table2.zk_kno');
$join->on('table1.ns_show_flg', '=', DB::raw(0));
$join->on('ns_ymd','>',DB::raw("'".$param1."'"));
})
->where('zk_kno', DB::raw($param2))
->toSql()
But it's return sql
"select `zk_z_hako` as `CASE` from `t_zaikmst` left join `t_nsyutrn` on `t_nsyutrn`.`ns_kno` = `t_zaikmst`.`zk_kno` and `t_nsyutrn`.`ns_show_flg` = 0 and `ns_ymd` > '20160310' where `zk_kno` = 1972640100"
i don't sure it true.

Answer 1

If you want to make custom select than you need to use raw queries as select parameter like this:
->select(\DB::raw($squery))