当mysql版本为5.7.10时查询中的错误（在mysql 5.6.20中有效）

Question

I needed to migrate to another server host and the MySQL version is different. I asked to change the version, but while this not happen my site return errors.

The main error is in this query:

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

In MySQL 5.6.20 it works, but in MySQL 5.7.10 return this error:

Unknown column '_id' in 'where clause'

Someone knows how to fix?

Thanks.

Answer 1

There is a bug in mysql for that https://bugs.mysql.com/bug.php?id=79549 You should rewrite your query. Problem is in that_ID is an alias and those arent aprooved in where clausule.

Answer 2

You can fix it by changing

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

to

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

The modified query:

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