MySQL:如何转换为 EAV - 第 2 部分？

Question

这是第 1 部分:MySQL: how to convert to EAV?

现在我也想做一些不同的事情。假设我有下表:

TABLE: one
=======================================
| id | fk_id | attribute  | value     |
=======================================
| 1  | 10    | first_name | John      |
| 2  | 10    | last_name  | Doe       |
| 3  | 55    | first_name | Bob       |
| 4  | 55    | last_name  | Smith     |
---------------------------------------

我想把它转换成这个 EAV 模型:

TABLE: attribute
===================
| id | attribute  |
===================
| 1  | first_name |
| 2  | last_name  |
-------------------

TABLE: value
=====================================
| id | attribute_id | fk_id | value |
=====================================
| 1  | 1            | 10    | John  |
| 2  | 2            | 10    | Doe   |
| 3  | 1            | 55    | Bob   |
| 4  | 2            | 55    | Smith |
-------------------------------------

假设表 attribute 和 value 已经定义。如何将表 one 中的数据插入到两个目标表中。对我来说，一个大问题是如何使关系 (attribute.id => value.attribute_id) 正确。

Answer 1

INSERT INTO attribute
  (attribute)
SELECT DISTINCT
  attribute
FROM one ;

INSERT INTO value
  (attribute_id, fk_id, value)
SELECT 
  attribute.id, one.fk_id, one.value
FROM one
  JOIN attribute
    ON attribute.attribute = one.attribute ;