来自不同 sql 表的个性化 php 输出

Question

我正在创建一个通知页面，其中 显示的通知有 4 种类型

1) someone liked your post
2) someone shared your post
3) someone added you as a friend
4) someone commented your post

我已经获得了每个语句的 sql 代码，但我仍然不知道如何在单个 while($a=sql_array()){} 循环中混合所有内容，我知道我应该按日期使用 UNION 和 ORDER，但是如何发布个性化输出对于显示的每种类型的通知

DESIRED OUTPUT

A liked your page
B comment your post
C liked your page
D comment your post
E added you as a friend
F liked your page
G comment your post
H shared your post
I added you as a friend
J shared your post
K shared your post
L liked your page
M added you as a friend
N shared your post
O added you as a friend
P liked your page
Q comment your post
R added you as a friend
S added you as a friend
T comment your post
D liked your page

我有 6 张桌子

table_users
table_posts 
table_likes
table_shares
table_comments
table_community

每种类型的通知都遵循相同的模式

 SELECT u.`name`, p.post, p.date as OrderDate
  FROM likes (next shares, next, comments, community)
    LEFT JOIN Users as u on likes.id_liker=u.id_user
    LEFT JOIN Users as v on likes.liked_user_id=v.id_user
    LEFT JOIN Posts as p on likes.liked_post_id=p.id_post
         WHERE likes.liked_user_id=3

所以我使用由OrderDate 排序的UNION，他们检索结果但没有个性化类型的通知。我正在尝试总结，因为这是巨大的。

Answer 1

所以你想以不同的方式格式化这些事件？这就像在输出中添加一个鉴别器字段一样简单

SELECT "like", u.`name`, p.post, p.date as OrderDate FROM likes ...
UNION
SELECT "share", u.`name`, p.post, p.date as OrderDate FROM shares ...

现在在您的应用程序中，您可以根据第一列的值选择不同的格式。