I'm trying to implement a personalized news aggregator. I have to save user's preferred news sources in db. Should I store all the news sources liked by a user as JSON string and then decode it after retrieving?
我正在尝试实现一个个性化的新闻聚合器。我必须在db中保存用户喜欢的新闻源。我应该将用户喜欢的所有新闻源存储为JSON字符串，然后在检索后进行解码吗?
feeds | user
提要|用户
or have individual column for each news source(no of news sources would be around 200)?
或者每个新闻源都有单独的专栏(没有新闻源会在200左右)?
feed_name1 | feed_name2 | ..... | user
1 个解决方案
#1
2
Sounds like a many-to-many situation. A solution that used a person table, a newsfeed table, and a person_newsfeed table might be appropriate. There are lots of articles on line about this and any good database theory book (or Something like Oracle: The Complete Reference) should cover this in detail.
听起来像是多对多的情况。使用person表、newsfeed表和person_newsfeed表的解决方案可能是合适的。有很多关于这方面的文章，任何好的数据库理论书籍(或者类似Oracle:完整的引用)都应该详细介绍。
This article is a pretty good (but very short) summary: http://www.databaseprimer.com/pages/relationship_xtox/
这篇文章是一个很好的总结(但非常简短):http://www.databaseprimer.com/pages/relationship_xtox/
Oracle8 The Complete Reference covers this around page 35 with the worker, skill, workerskills example during their discussion of third normal form.
Oracle8完整的参考文献涵盖了第35页的工人，技能，工人技能的例子，在他们讨论的第三个正常形式。
#1
2
Sounds like a many-to-many situation. A solution that used a person table, a newsfeed table, and a person_newsfeed table might be appropriate. There are lots of articles on line about this and any good database theory book (or Something like Oracle: The Complete Reference) should cover this in detail.
听起来像是多对多的情况。使用person表、newsfeed表和person_newsfeed表的解决方案可能是合适的。有很多关于这方面的文章，任何好的数据库理论书籍(或者类似Oracle:完整的引用)都应该详细介绍。
This article is a pretty good (but very short) summary: http://www.databaseprimer.com/pages/relationship_xtox/
这篇文章是一个很好的总结(但非常简短):http://www.databaseprimer.com/pages/relationship_xtox/
Oracle8 The Complete Reference covers this around page 35 with the worker, skill, workerskills example during their discussion of third normal form.
Oracle8完整的参考文献涵盖了第35页的工人，技能，工人技能的例子，在他们讨论的第三个正常形式。