recipe db继续......
类别
cid | category_name
1 | desserts
2 | cakes
3 | biscuits
配方
id | recipe_name
1 | black forest cake
2 | angel cake
3 | melting moments
4 | croquembouche
5 | crepes suzette
成分
iid | ingredient_code | ingredient_name | ingredient_brand
1 | abc201 | self-raising flour | white wings
2 | abc202 | milk | pura
3 | abc203 | chocolate | plaistock
4 | abc204 | baking powder | mackenzie
5 | abc205 | plain flour | white wings
6 | abc206 | eggs | free range
recipe_categories
recipe_id | category_id
1 | 1
4 | 1
5 | 1
1 | 2
2 | 2
3 | 3
4 | 3
recipe_ingredients
recipe_id | ingredient_id
1 | 1
2 | 1
4 | 1
1 | 2
2 | 2
3 | 2
5 | 2
1 | 3
2 | 3
1 | 4
3 | 5
4 | 5
正如ozatomic所建议的那样,我正在使用以下查询:
SELECT A.recipe_name, GROUP_CONCAT(ingredient_name) AS ingredient_names
FROM recipes A
LEFT JOIN recipe_ingredients B ON A.id = B.recipe_id
LEFT JOIN ingredients C ON B.ingredient_id = C.iid
LEFT JOIN recipe_categories D ON A.id = D.recipe_id
LEFT JOIN categories E ON D.category_id = E.cid
WHERE category_id = <search_id>
GROUP BY id
问题是,我意识到我将需要在成分表中添加其他字段,例如ingredient_code和ingredient_brand,这意味着我无法使用GROUP_CONCAT列出成分,因为我需要输出以下内容网(仍然按类别):
black forest cake:
abc201 white wings self-raising flour
abc202 pura milk
abc203 plaistock chocolate
croquembouche:
abc201 white wings self-raising flour
abc204 white wings plain flour
crepes suzette:
abc202 pura milk
abc205 white wings plain flour
abc206 free range eggs
我觉得我要么必须使用两个查询来实现这一点,要么使用foreach循环。哪个最好,我该怎么做呢?
编辑:我还需要能够使用html标签或输入div或其他任何内容来格式化结果。
答案 0 :(得分:0)
answer I gave when you asked this yesterday仍然适用。 :)
你确实需要整理一个列表并在其上循环以提取您正在寻找的确切数据。