Codeigniter - 忽略子查询中的值

Question

我不知道我的查询出错了，但是dateread的值被忽略了，而且我得到了

  

错误消息：未定义属性：stdClass :: $ dateread。

SELECT `id`.`id`, `id`.`name`, `id`.`deleted`, `id`.`filepath`, `id`.`createddate`, (SELECT createddate as dateread FROM documents_users iu WHERE id.id = iu.docs_id AND iu.users_id = 2346)
FROM (`documents` AS id)
JOIN `documents_years` AS iy ON `id`.`id` = `iy`.`docs_id`

有人可以帮忙吗？“

Answer 1

只需更新您的查询，然后在完成sub_query之后获取$dateread的值，您需要定义dateread，而不是在sub_query中，否则它将是 (SELECT createddate FROM documents_users iu WHERE id.id = iu.docs_id AND iu.users_id = 2346)

SELECT `id`.`id`, `id`.`name`, `id`.`deleted`, `id`.`filepath`, `id`.`createddate`,
(SELECT createddate FROM documents_users iu WHERE id.id = iu.docs_id AND iu.users_id = 2346) as dateread
FROM (`documents` AS id)
JOIN `documents_years` AS iy ON `id`.`id` = `iy`.`docs_id`