Question

如何选择10篇文章而不必运行1个查询来获取每篇文章的翻译（总共11个查询）？我有3张桌子;文化，文章和翻译：

Cultures
id code language
-- ---- ---------
1  en   English
2  no   Norwegian

Articles
id title content      
-- ----- -------------
1  Home  Hello, world!
2  About This is me...
...

Translations
id culture object FK field   value
-- ------- ------ -- ------- ---------------
1  1       Page   1  title   Home
2  1       Page   1  content Hello, world!
3  2       Page   1  title   Hjem
4  2       Page   1  content Hei, verden!
5  1       Page   2  title   About
6  1       Page   2  content This is me...
7  2       Page   2  title   Om
8  2       Page   2  content Dette er meg...
...

非常感谢任何帮助！

编辑：说我想要获取所有文章，翻译成挪威语。这是我的不完整查询（它不会将FK连接到a.id）：

SELECT
    a.id,
    (SELECT tr.value FROM translations tr WHERE tr.object='Page' 
AND field='title' AND tr.culture=2) as title,
    (SELECT tr.value FROM translations tr WHERE tr.object='Page' 
AND tr.field='content' AND tr.culture=2) as content
FROM
    articles a

编辑2：与此相同的问题： Best mysql query for selecting multiple rows that EACH need multiple associative rows from another table

Answer 1

好吧，translations.FK似乎与文章ID相关联。因此，您选择所有文章，并为每篇文章选择所有翻译。

通过此查询，您的应用程序代码将必须解释“标题”/“内容”的内容。

SELECT c.language, a.title, t.field, t.value
FROM articles a 
JOIN translations t ON a.ID = t.FK
JOIN cultures c on t.culture = c.id

通过此查询，您可以获得“标题”和“内容”列

SELECT a.title, t1.value as title, t2.value as content
FROM articles a 
JOIN translations t1 ON a.ID = t1.FK and t1.field = 'title'
JOIN translations t2 ON a.ID = t2.FK and t2.field = 'content'

选择多个翻译文章（记录）

1 个答案: