mysql - mysql版本为5.7.10时查询出错(在mysql 5.6.20有效)

Question

我需要迁移到另一台服务器主机，MySQL 版本不同。我要求更改版本，但虽然这没有发生，但我的网站返回错误。

主要错误在此查询中:

SELECT p.*
FROM product p INNER JOIN
     account a
     ON a.id = p.account_id INNER JOIN
     supplier s
     ON a.id = s.account_id
 WHERE p.status = 1 AND a.type = 'supplier' AND
       s.id IN (SELECT supplier_id FROM supplier_location WHERE location_id IN (SELECT _id FROM (SELECT @r AS _id, (SELECT @r := parent_id FROM location WHERE id = _id) AS parent_id FROM (SELECT @r := 3523) vars, location h WHERE @r <> 0) T1 ) ) AND
       p.name LIKE '%nira%'
ORDER BY p.category_id, p.account_id, p.name ASC

在 MySQL 5.6.20 中它可以工作，但在 MySQL 5.7.10 中返回此错误:

Unknown column '_id' in 'where clause'

有人知道怎么解决吗？

谢谢。

Answer 1

您可以通过更改来修复它

(SELECT @r := parent_id FROM location WHERE id = _id)

至

(SELECT @r := parent_id FROM location WHERE id = @r)

修改后的查询:

SELECT p.*
FROM product p INNER JOIN
     account a
     ON a.id = p.account_id INNER JOIN
     supplier s
     ON a.id = s.account_id
 WHERE p.status = 1 AND a.type = 'supplier' AND
       s.id IN (SELECT supplier_id FROM supplier_location WHERE location_id IN (SELECT _id FROM (SELECT @r AS _id, (SELECT @r := parent_id FROM location WHERE id = @r) AS parent_id FROM (SELECT @r := 3523) vars, location h WHERE @r <> 0) T1 ) ) AND
       p.name LIKE '%nira%'
ORDER BY p.category_id, p.account_id, p.name ASC