搜索表whitin字符串php

Question

我有3张桌子

我向我的数据库提交了一个帖子：" Hello #Today is an illusion"，它创建了下一个：

table_post: id_post  | post
                3       Hello #Today is an illusion

table_hashtags: id_hashtag  | hashtag
                    1          #Today

 table_hashtags_relation: id_relation  | id_hashtags  | id_post
                                1           1               3   

它会保留主题标签#today id_hashtag=1并将其与帖子编号3相关联

如果我将帖子编辑为："Hello #Tomorrow is an illusion"，则会将#tomorrow保存为id_hashtag=2，并将其与第3号帖子相关联。

如何在编辑后的帖子中首先搜索#today以删除它？ （并删除它的关系），以便表格结果如下？

table_post: id_post  | post
                3       Hello #Tomorrow is an illusion

table_hashtags: id_hashtag  | hashtag
                    2          #Tomorrow

table_hashtags_relation: id_relation  | id_hashtags  | id_post
                                2           2               3   

Answer 1

您可以使用id_post查询从table_hashtag_relation检索所有id_relation ..然后您可以查询从table_hashtag中提取所有hashtag ...然后删除所需的＃标签。