问题描述
想知道如何在 php 和 mysql 数据库中创建标签系统，我最初的想法是在存储文章的表中创建一行，命名标签，并列出用逗号分隔的标签，但我是不知道如何创建一个搜索匹配标签的查询，我不想每次有人点击标签时都查询每篇文章.谁能帮忙?
wondering how i can create a tagging system in php and with a mysql database, my initial thoughts were to create a row in the table where the articles are stored, named tags, and list the tags seperated by commas, but i am not sure how i can create a query that searches for matching tags, i dont want to have to query every article everytime someone clicks a tag. can anyone help?
推荐答案
您正在描述文章和标签之间的多对多关系.您可能希望使用中间联结表来解决这种关系.
You're describing a many-to-many relationship between Articles and Tags. You'd want to use an intermediate junction table to resolve that relationship.
现在，要查找与所选标签匹配的所有文章:
Now, to find all articles that match a selected tag:
SELECT a.article_title
FROM Tag t
INNER JOIN Article_Tag_Xref atx
ON t.tag_id = atx.tag_id
INNER JOIN Article a
ON atx.article_id = a.article_id
WHERE t.tag_name = 'SelectedTagName'
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