Question

如何在Laravel 5.2中进行此查询：

UPDATE product p
    SET price = ( SELECT price FROM product_price WHERE product_id = p.id AND price > 0 AND inventory > 0 AND active = 1 ORDER BY price desc limit 1)
    SET discounts = ( SELECT discount FROM product_price WHERE product_id = p.id AND price > 0 AND inventory > 0 AND active = 1 ORDER BY price desc limit 1)
    WHERE
    product_state = 1

如何用db运行它？

Answer 1

您可以为这种复杂查询应用原始表达式。以下是官方Laravel Doc上的示例参考：

https://laravel.com/docs/5.5/queries#raw-expressions

Answer 2

我们需要查看您确切的数据库架构和一些数据，以确认，但以下内容应该在正确的轨道上：

use DB; // Ensure we have access to the DB facade

$result = DB::table('product')
    ->where('product_state', '=', 1)
    ->update([
        'price'     => DB::raw('(SELECT price FROM product_price WHERE product_id = product.id AND price > 0 AND inventory > 0 AND active = 1 ORDER BY price desc limit 1)'),
        'discounts' => DB::raw('(SELECT discount FROM product_price WHERE product_id = product.id AND price > 0 AND inventory > 0 AND active = 1 ORDER BY price desc limit 1)')
    ]);

如何在Laravel，子查询中进行更新

2 个答案: