php - 一个表中的字段值可以用作 MySQL 查询中的列名吗？

Question

假设我有两个表:

mysql> show columns from profiles;
+--------------+--------------+------+-----+---------+----------------+
| Field        | Type         | Null | Key | Default | Extra          |
+--------------+--------------+------+-----+---------+----------------+
| id           | int(11)      | NO   | PRI | NULL    | auto_increment | 
| full_name    | varchar(100) | NO   |     | NULL    |                | 
| date_of_birth| date         | NO   |     | NULL    |                | 
+--------------+--------------+------+-----+---------+----------------+
mysql> select * from profiles;
+-------------------+----------------+
| id  | full_name   | date_of_birth  |
+-----+-------------+----------------+
| 1   | John Smith  | 2000-01-01     |
| 2   | Anna Smith  | 1995-01-03     |
+-----+-------------+----------------+

和

mysql> show columns from language_en;
+--------------+--------------+------+-----+---------+----------------+
| Field        | Type         | Null | Key | Default | Extra          |
+--------------+--------------+------+-----+---------+----------------+
| column_name  | varchar(100) | NO   |     | NULL    |                | 
| label        | varchar(100) | NO   |     | NULL    |                | 
+--------------+--------------+------+-----+---------+----------------+
mysql> select * from language_en;
+-------------------+----------------+
| column_name      | label           |
+------------------+-----------------+
| id               | ID              |
| full_name        | Name            |
| date_of_birth    | DOB             |
+------------------+-----------------+

我想运行一个返回的查询:

+-------------------+----------------+
| ID  | Name        | DOB            |
+-----+-------------+----------------+
| 1   | John Smith  | 2000-01-01     |
| 2   | Anna Smith  | 1995-01-03     |
+-----+-------------+----------------+

这只是查询“SELECT * FROM profile”，但使用标签而不是列名。如何使用列名称而不是直接输入它们来执行此操作？ 我知道我能做到:

SELECT id AS ID, full_name AS Name, date_of_birth AS DOB FROM profiles

但是我追求的是动态的东西，例如:

SELECT id AS language_en.label FROM profiles, language_en WHERE language_en.column_name = profiles.COLUMN_HEADER????

任何帮助将不胜感激

Answer 1

简短回答:我不这么认为。我认为 MySQL 的 AS 语句除了简单的文本标签之外不接受任何其他内容。

我认为将国际化放入数据库模式级别可能是错误的想法；通过在 Web 应用程序 (php) 层中保持翻译级别，您似乎可以让您的生活更加理智。毕竟，您的用户永远不需要直接查看列的名称，对吗？