查询生成器laravel中的算术运算 [英] arithmetic operations in query builder laravel
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问题描述
我想在laravel 5.4的查询构建器中对该查询进行预设置
i want to prerform this query in query builder of laravel 5.4
select title, price, price*tauxDiscount/100 as newPrice
from products p, hasdiscount pd, discounts d
WHERE p.idProd = pd.idProd
and d.idDiscount = pd.idDiscount
and now() BETWEEN dateStart and dateEnd
所以我写这个
$products = DB::table('products')
->join('hasDiscount', 'products.idProd', '=', 'hasDiscount.idProd')
->join('discounts', 'discounts.idDiscount', '=', 'hasDiscount.idDiscount')
->select('products.*', '(products.price * discounts.tauxDiscount / 100) as newPrice')
->get();
但是他显示了这个错误
[SQLSTATE[42S22]: Column not found: 1054 Unknown column '(products.price
* discounts.tauxDiscount / 100)' in 'field list' (SQL: select
`products`.*, `(products`.`price * discounts`.`tauxDiscount / 100)` as
`newPrice` from `products` inner join `hasDiscount` on
`products`.`idProd` = `hasDiscount`.`idProd` inner join `discounts` on
`discounts`.`idDiscount` = `hasDiscount`.`idDiscount`)][1]
推荐答案
您需要使用原始表达式:
You need to use raw expression like that :
$products = DB::table('products')
->join('hasDiscount', 'products.idProd', '=', 'hasDiscount.idProd')
->join('discounts', 'discounts.idDiscount', '=', 'hasDiscount.idDiscount')
->select(DB::raw('products.*,(products.price * discounts.tauxDiscount/100) as newPrice'))
->get();
https://laravel.com/docs/5.4/queries#raw-expressions
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