1
我有5個表：MySQL的遞歸搜索
library_item
============
id
title
description
index_text
library_item_rel_category
=========================
item_id
category_id
library_category
================
id
parent_id
name
library_item_rel_tag
====================
item_id
tag_id
library_tag
===========
id
name
而且目前我有這個MySQL請求（使用PHP PDO）：
SELECT
i.*,
((
((MATCH (i.title) AGAINST (:terms)) * 5) +
((MATCH (i.description) AGAINST (:terms)) * 4) +
((MATCH (i.index_text) AGAINST (:terms)) * 3) +
(MATCH (i.title, i.description, i.index_text) AGAINST (:terms))
) + IFNULL(c.score, 0) + IFNULL(t.score, 0)) as score
FROM
library_item AS i
LEFT JOIN
(
SELECT
rel_c.item_id,
((MATCH(c.name) AGAINST (:terms)) * 5) AS score
FROM
library_item_rel_category rel_c
INNER JOIN
library_category c ON rel_c.category_id = c.id
WHERE
MATCH(c.name) AGAINST (:terms)
ORDER BY
score DESC
) AS c ON c.item_id = i.id
LEFT JOIN
(
SELECT
rel_t.item_id,
((MATCH(t.name) AGAINST (:terms)) * 5) AS score
FROM
library_item_rel_tag rel_t
INNER JOIN
library_tag t ON rel_t.tag_id = t.id
WHERE
MATCH(t.name) AGAINST (:terms)
ORDER BY
score DESC
LIMIT 1
) AS t ON t.item_id = i.id
WHERE
i.is_archive = 0 AND
((
((MATCH (i.title) AGAINST (:terms)) * 5) +
((MATCH (i.description) AGAINST (:terms)) * 4) +
((MATCH (i.index_text) AGAINST (:terms)) * 3) +
(MATCH (i.title, i.description, i.index_text) AGAINST (:terms))
) + IFNULL(c.score, 0) + IFNULL(t.score, 0)) > 5
GROUP BY
i.id
ORDER BY
score DESC
我想補充匹配父類的能力直到擊中根。在單個查詢中可以使用MySQL嗎？
如果需要，我準備好更改表結構，這是我的第一個遞歸樹。