2

这个问题与我在关于库存控制应用程序的原始问题中建议的模式有关。

我正在尝试创建一个 MySQL 查询，为特定项目提供当前库存。

查询正在运行，但我想知道是否有更有效的方法来获取我需要的信息。

SELECT 's'.*,
    'v1'.'attribute_id' AS 'att1',
    'v1'.'value' AS 'val1'
    'v2'.'attribute_id' AS 'att2',
    'v2'.'value' AS 'val2'
FROM 'eav_ev' AS 'ev1'
INNER JOIN 'stock' AS 's' ON s.id = ev1.stock_id
INNER JOIN 'eav_ev' AS 'ev2' ON ev1.stock_id = ev2.stock_id
INNER JOIN 'eav_value' AS 'v1' ON v1.id = ev1.value_id
INNER JOIN 'eav_value' AS 'v2' ON v2.id = ev2.value_id
WHERE (ev1.entity_id = '45')
    AND (ev1.value_id <> ev2.value_id)
    AND (s.total > 0)
GROUP BY 'ev1'.'stock_id'
ORDER BY 'ev1'.'value_id' ASC

这会返回一些类似的东西

array (1) {
    [0] => array(5) {
        ["stock_id"] => "2"
        ["att1"] => "3"
        ["val1"] => "M12"
        ["att2"] => "4"
        ["val2"] => "45"
    }
}

看起来很乱，但我可怜的大脑无法想出更好的东西。

有什么建议么？

4

1 回答 1

0

如果您首先存储属性列表，attribute_id AS att1您也可以使用而不是使用。value AS attribute_X您可以简单地缓存查询，之后您可以在 1 个清除查询中选择所有需要的数据。

假设您首先获取了属性 ID 列表（即SELECT attribute_id FROM eav_value），请选择以下选项：

SELECT
    v1.value_id AS attribute_1 -- (or whatever the ID was fetched in the first query)
    v2.value_id AS attribute_2 -- (or whatever the second ID was fetched in the first query)
...
于 2010-08-10T03:46:37.313 回答