how to translate this mysql code in laravel - mysql

Question

I get 3 tables in my database. I want to know how to translate this mysql query in laravel. Here is the code:
SELECT item.id, item.libelle, entre.item_id, entre.total AS etotal, entre.prix_unitaire AS eprix, sortie.total AS stotal, sortie.prix_unitaire AS sprix, (entre.total - sortie.total) AS restant
FROM (
SELECT id, libelle
FROM items
WHERE EXISTS (
SELECT *
FROM entrees
WHERE items.id = entrees.item_id
AND date_entree = '23-10-2019'
)
) item
LEFT JOIN (
SELECT item_id, prix_unitaire, sum(total) total
FROM entrees
WHERE date_entree = '23-10-2019'
GROUP BY item_id
) entre ON item.id = entre.item_id
LEFT JOIN (
SELECT item_id, prix_unitaire, sum(total) total
FROM sorties
GROUP BY item_id
) sortie ON entre.item_id = sortie.item_id;
For table entrees enter image description here
For table items enter image description here
For table sortiesenter image description here
So please help me. And if possible explain me the query cause honestly I found it on another forum

Answer 1

First let's break down your query into all the subqueries and then write them all together.
Subquery 1
SELECT id, libelle
FROM items
WHERE EXISTS (
SELECT *
FROM entrees
WHERE items.id = entrees.item_id
AND date_entree = '23-10-2019'
)
Translated to Query Builder:
$subquery1 = DB::table('items')
->select('id', 'libelle')
->whereExists(function ($query) {
$query->from('entrees')
->whereColumn('items.id', 'entrees.item_id')
->where('date_entree', '23-10-2019');
});
// You can verify this by dumping $subquery1->toSql() in the console.
Subquery 2
SELECT item_id, prix_unitaire, sum(total) total
FROM entrees
WHERE date_entree = '23-10-2019'
GROUP BY item_id
Translated to Query Builder:
$subquery2 = DB::table('entrees')
->select('item_id', 'prix_unitaire')
->selectRaw('sum(total) as total')
->where('date_entree', '23-10-2019')
->groupBy('item_id');
// You can verify this by dumping $subquery2->toSql() in the artisan console.
Subquery 3
SELECT item_id, prix_unitaire, sum(total) total
FROM sorties
GROUP BY item_id
Translated to Query Builder:
$subquery3 = DB::table('sorties')
->select('item_id', 'prix_unitaire')
->selectRaw('sum(total) as total')
->groupBy('item_id');
// You can verify this by dumping $subquery3->toSql() in the artisan console.
Now, to put it all together:
$query = DB::table($subquery1, 'item')
->select(
'item.id',
'item.libelle',
'entre.item_id',
'entre.total as etotal',
'entre.prix_unitaire as eprix',
'sortie.total as stotal',
'sotrie.prix_unitaire as sprix'
)
->selectRaw('(entre.total - sortie.total) as restant')
->leftJoinSub($subquery2, 'entre', function ($join) {
$join->on('item.id', '=', 'entre.item_id');
})
->leftJoinSub($subquery3, 'sortie', function ($join) {
$join->on('entre.item_id', '=', 'sortie.item_id');
});
// You can verify this by dumping $query->toSql() in the artisan console.
// To get the results, simply append the ->get() to the $query or do $query->get();
Below is a screen capture of this code being tested in the artisan console. The reason I'm using $db-> instead of DB:: is because I ran the following line before:
$db = DB::connection('mysql');
which makes sure the query is translated to mysql when I use toSql(). Pay it no mind.
Everything I used can be found in the official documentation about queries.