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，但是这不会发生，我的网站会返回错误。

主要错误在于此查询：

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 = _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中可行，但在MySQL 5.7.10中返回此错误：

Unknown column '_id' in 'where clause'

有人知道如何解决？

感谢。

Answer 1

mysql中有一个错误https://bugs.mysql.com/bug.php?id=79549 你应该重写你的查询。问题在于the_ID是一个别名，并且那些在clausule中没有被删除。

Answer 2

您可以通过更改

来修复它

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

到

(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

mysql版本为5.7.10时查询出错（在mysql 5.6.20中有效）

2 个答案: