对于CMS系统,我试图在文章关系中优雅地搜索用户提供的网址。
我有两个表:一个包含文章(cms_article
),另一个包含文章的特定语言内容(cms_content
)。
因此cms_article
中的1行可以在cms_content
中有多个tupples,因为它代表文章的不同语言表示。
reference
列也可以嵌套不同的文章,该列引用cms_article
中的id列。如果它是顶级文章,则此cms_article.ref
= NULL
表格:
cms_article id | ref | published
cms_content cid | aid | lang | url | browserTitle | content | etc etc
从这两个表中我想创建一个可用于查找URL的视图。所以我想为cms_article
中的每个给定的tupple构建一个totalURL字段,每个父/ ref作为URL的一部分。
例如,让我们回顾一下这个页面/文章的结构:
AID English Dutch More languages
1 /Products /Producten
4 /Products/Product-2 /Producten/Product-2
7 /Products/Product-2/screenshots /Producten/Product-2/afbeeldingen
34 /Products/Product-2/pricing /Producten/Product-2/prijzen
12 /Products/Product-5 /Producten/Product-5
6 /About-us /Over-ons
每行代表cms_article
关系中的文章和1个元组。网址字段来自相应的cms_content.url
字段。
如何将每个元组的totalURL聚合为一个视图,以便生成如下视图:
cms_view :
aid = article ID = integer
lang = language = NL|EN|...
totalURL = agregated URL = /products/product-2/pricing
对于上面的例子,它必须生成下表:
1 | EN | /Products
1 | NL | /Producten
4 | EN | /Products/Product-2
4 | NL | /Producten/Product-2/afbeeldingen
etc etc
当然,我可以遍历cms_content
中的每个元组,并在PHP中找到引用(并为每个级别和每个元组重复一次)。但是,由于这给服务器带来了很大的压力,我正在寻找一个像视图一样优雅的SQL解决方案。
修改
这是我走了多远,我觉得我很亲密。寻求解决方案:将url
和parentURL
合并到一个字段中。以及如何深入三个层次。
SELECT
a.id AS aid, c.lang, a.ref,
c.url,
(
SELECT c2.url
FROM cms_content AS c2
WHERE c2.aid = a.ref
AND
c2.lang = c.lang
) AS parentURL
FROM cms_content AS c
LEFT JOIN cms_article AS a ON c.aid = a.id
WHERE a.domain = 'some.url'
AND a.published =1
ORDER BY aid
答案 0 :(得分:0)
如果您了解所有语言,则可以连接子查询。
示例:
SELECT
aid
, CONCATENATE(
CASE WHEN (SELECT langcode FROM cms_article x WHERE a.aid = x.aid AND language = 'EN')
THEN
CONCATENATE(
(SELECT langcode FROM cms_article x WHERE a.aid = x.aid AND language = 'EN')
, '|')
ELSE ''
END,
CASE WHEN (SELECT langcode FROM cms_article x WHERE a.aid = x.aid AND language = 'DU')
THEN
CONCATENATE(
(SELECT langcode FROM cms_article x WHERE a.aid = x.aid AND language = 'DU')
, '|')
ELSE ''
END) as language
, CONCATENATE(
CASE WHEN (SELECT totalUrl FROM cms_article x WHERE a.aid = x.aid AND language = 'EN')
THEN
CONCATENATE(
(SELECT totalUrl FROM cms_article x WHERE a.aid = x.aid AND language = 'EN')
, '|')
ELSE ''
END,
CASE WHEN (SELECT totalUrl FROM cms_article x WHERE a.aid = x.aid AND language = 'DU')
THEN
CONCATENATE(
(SELECT totalUrl FROM cms_article x WHERE a.aid = x.aid AND language = 'DU')
, '|')
ELSE ''
END) as agregatedUrl
FROM cms_content a