How can I convert many statement mysql dinamis to laravel eloquent? - php

Question

Mysql query like this :
SET #sql_dinamis = (
SELECT GROUP_CONCAT(
DISTINCT CONCAT(
'SUM( IF(id_barang=', id_barang, ',jml_bk,0) ) AS br',
id_barang
)
)
FROM barang_keluar
);
SET #SQL = CONCAT(
'SELECT month(tgl_keluar) as m, ',#sql_dinamis,'
FROM barang_keluar
WHERE month(tgl_keluar) and year(tgl_keluar)=2019
GROUP BY month(tgl_keluar)'
);
PREPARE stmt FROM #sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
I want to convert it to Laravel Eloquent, but I'm confused. Because there exist many statement. There exist PREPARE, EXECUTE, SET, DEALLOCATE etc. You can see query above.
How can I convert it to Laravel Eloquent?

Answer 1

You don't need to manually prepare statements (PREPARE, EXECUTE, DEALLOCATE) in Laravel since the Query Builder calls PDO::prepare, PDO::bindValue and PDO::execute behind the scenes.
You will be responsable for escaping/sanitizing the input however.
You can achieve this query by using a few raw methods with the query builder.
After some experimentation, I found out the real sql query created by your code is something like this:
SELECT
month(tgl_keluar) as m,
SUM(IF(id_barang=1,jml_bk,0)) AS br42,
SUM(IF(id_barang=2,jml_bk,0)) AS br48,
SUM(IF(id_barang=3,jml_bk,0)) AS br13,
SUM(IF(id_barang=4,jml_bk,0)) AS br14,
.
.
.
SUM(IF(id_barang=n-1,jml_bk,0)) AS brn-1
SUM(IF(id_barang=n,jml_bk,0)) AS brn
FROM barang_keluar
WHERE month(tgl_keluar) AND year(tgl_keluar)=2019
GROUP BY month(tgl_keluar)
To translate this into the query builder, we'll need 2 queries:
/**
* Equivalent to
*
* SELECT
* id_barang
* FROM barang_keluar;
*/
$ids_barang = DB::table('barang_keluar')
->select('id_barang')
->get();
/**
* Equivalent to
*
* SELECT
* month(tgl_keluar) as m,
* FROM barang_keluar
* WHERE month(tgl_keluar) AND year(tgl_keluar)=2019
* GROUP BY `m`;
*/
// Pass year as a variable if you want. You can also hardcode it
$year = 2019;
$query = DB::table('barang_keluar')
->selectRaw('month(tgl_keluar) as m')
->whereRaw('month(tgl_keluar) and year(tgl_keluar)=?', [$year])
->groupBy('m');
Since we didn't call ->get(), we can still add to the query.
// Now, we add all the `SUM()` statements.
foreach ($ids_barang as $row) {
$query->selectRaw("sum(if(eme_id=?,eme_empresa_id,0)) as br{$row->id_barang}", [$row->id_barang]);
}
// And finally, get the query results
$results = $query->get();
You can verify this produces the query by dumping $query->>toSql().