嗨,我最近开始研究Symfony4。我有4个表是按照EAV规则设计的。 eav_entity,eav_attribute,eav_entity_instance,eav_value_text具有以下字段。
mysql> select * from eav_entity;
+----+---------+---------+---------------------+---------------------+
| id | code | label | created_at | updated_at |
+----+---------+---------+---------------------+---------------------+
| 5 | user | User | 2020-05-07 21:53:48 | 2020-05-07 21:53:48 |
| 6 | project | Project | 2020-05-07 21:53:48 | 2020-05-07 21:53:48 |
+----+---------+---------+---------------------+---------------------+
mysql> select * from eav_attribute;
+----+-----------+-----------------+-----------+-----------+-------------+---------------------+---------------------+
| id | entity_id | code | type | is_unique | is_required | created_at | updated_at |
+----+-----------+-----------------+-----------+-----------+-------------+---------------------+---------------------+
| 33 | 5 | full_name | text | 0 | 1 | 2020-05-07 21:59:20 | 2020-05-07 21:59:20 |
| 34 | 5 | email | text | 1 | 1 | 2020-05-07 22:00:32 | 2020-05-07 22:00:32 |
| 35 | 5 | phone_number | varchar | 1 | 1 | 2020-05-07 22:00:51 | 2020-05-07 22:00:51 |
| 36 | 5 | password | varchar | 1 | 1 | 2020-05-07 22:01:02 | 2020-05-07 22:01:02 |
| 43 | 6 | project_name | varchar | 0 | 1 | 2020-05-11 00:49:41 | 2020-05-11 00:49:41 |
| 44 | 6 | project_id | varchar | 1 | 1 | 2020-05-11 00:49:41 | 2020-05-11 00:49:41 |
| 45 | 6 | project_manager | varchar | 0 | 1 | 2020-05-11 00:49:41 | 2020-05-11 00:49:41 |
| 46 | 6 | players | text | 0 | 1 | 2020-05-11 00:49:41 | 2020-05-11 00:49:41 |
| 47 | 5 | is_admin | boolean | 0 | 0 | 2020-05-12 10:21:33 | 2020-05-12 10:21:33 |
| 49 | 5 | is_enabled | boolean | 0 | 0 | 2020-05-16 17:34:03 | 2020-05-16 17:34:03 |
| 51 | 5 | last_activity | timestamp | 0 | 0 | 2020-05-16 22:20:45 | 2020-05-16 22:20:45 |
| 58 | 5 | experience | varchar | 0 | 0 | 2020-05-18 18:26:30 | 2020-05-18 18:26:30 |
| 59 | 5 | branch | varchar | 0 | 0 | 2020-05-18 22:18:53 | 2020-05-18 22:18:53 |
+----+-----------+-----------------+-----------+-----------+-------------+---------------------+---------------------+
mysql> select * from eav_entity_instance;
+----+-----------+---------------------+---------------------+
| id | entity_id | created_at | updated_at |
+----+-----------+---------------------+---------------------+
| 38 | 5 | 2020-05-16 22:21:50 | 2020-05-16 22:21:50 |
| 39 | 5 | 2020-05-17 21:52:03 | 2020-05-17 21:52:03 |
| 40 | 5 | 2020-05-17 21:53:10 | 2020-05-17 21:53:10 |
| 41 | 6 | 2020-05-17 21:57:24 | 2020-05-17 21:57:24 |
| 42 | 6 | 2020-05-17 22:20:38 | 2020-05-17 22:20:38 |
| 53 | 5 | 2020-05-19 21:47:32 | 2020-05-19 21:47:32 |
| 54 | 5 | 2020-05-19 21:49:07 | 2020-05-19 21:49:07 |
| 55 | 5 | 2020-05-19 21:49:09 | 2020-05-19 21:49:09 |
| 56 | 5 | 2020-05-20 20:57:05 | 2020-05-20 20:57:05 |
+----+-----------+---------------------+---------------------+
mysql> select * from eav_value_text;
+----+-------------+--------------+----------------------+---------------------+---------------------+
| id | instance_id | attribute_id | value | created_at | updated_at |
+----+-------------+--------------+----------------------+---------------------+---------------------+
| 63 | 38 | 33 | Raj | 2020-05-16 22:21:50 | 2020-05-16 22:21:50 |
| 64 | 38 | 34 | [email protected] | 2020-05-16 22:21:50 | 2020-05-16 22:21:50 |
| 65 | 39 | 33 | Ank | 2020-05-17 21:52:03 | 2020-05-17 21:52:03 |
| 66 | 39 | 34 | [email protected] | 2020-05-17 21:52:03 | 2020-05-17 21:52:03 |
| 67 | 40 | 33 | Bas | 2020-05-17 21:53:10 | 2020-05-17 21:53:10 |
| 68 | 40 | 34 | [email protected] | 2020-05-17 21:53:10 | 2020-05-17 21:53:10 |
| 69 | 41 | 46 | 38 | 2020-05-17 21:57:24 | 2020-05-17 21:57:24 |
| 70 | 42 | 46 | 38,39 | 2020-05-17 22:20:38 | 2020-05-17 22:20:38 |
| 81 | 53 | 34 | [email protected] | 2020-05-19 21:47:32 | 2020-05-19 21:47:32 |
| 82 | 54 | 34 | [email protected] | 2020-05-19 21:49:07 | 2020-05-19 21:49:07 |
| 83 | 55 | 34 | [email protected] | 2020-05-19 21:49:09 | 2020-05-19 21:49:09 |
| 84 | 53 | 33 | Vij | 2020-05-19 21:59:35 | 2020-05-19 21:59:35 |
| 85 | 54 | 33 | Abd | 2020-05-19 22:04:59 | 2020-05-19 22:04:59 |
| 86 | 56 | 34 | [email protected] | 2020-05-20 20:57:05 | 2020-05-20 20:57:05 |
| 87 | 55 | 33 | Jam | 2020-05-21 16:07:30 | 2020-05-21 16:07:30 |
+----+-------------+--------------+----------------------+---------------------+---------------------+
项目和用户是两个具有不同属性的实体。
在eav_entity_instance中,您可以看到用户和雇员具有不同的attribute_id。
我的问题是我需要生成查询,以便以没有用户参与的项目的方式返回用户的instance_id。
在eav_attribute表中,有一个名为player的属性,其ID为46。
此值存储在eav_value_text表中,其中用户的instance_id以逗号分隔。
任何人都可以帮助我进行查询,以使每个instance_id与玩家之间用逗号分隔的值匹配,并计算每个用户参与的项目数,并按计数的排序顺序返回结果。
例如,instance_id 38是user的用户,并且在2个项目中重复使用instance_id为41和42。因此,类似地,实例ID为39的用户只能在一个值为42的情况下找到。
所以,由于实例ID为38的用户有2个项目,实例ID为38的用户有1个项目,如果在ASC中对它进行排序,而在DESC中对它进行排序,则结果应如下所示。
+---+
|id +
+---+
|38 |
|39 |
+---+
在SQL Server中,您可以使用功能STRING_SPLIT,但是谷歌快速搜索显示它在MySql中不存在。但是我的搜索结果确实指向this site,您可以通过以下方式使用信息来解决您的问题(SQL fiddle):
CREATE TABLE ProjectMembers
( instance_id int
, value varchar(500)
);
INSERT INTO ProjectMembers(instance_id, value)
VALUES (41, '38')
, (42, '38,39');
/* Be sure that the amount of numbers in this table is at least as long as the
maximum amount of project members in a project */
CREATE TABLE Numbers
(Number int);
INSERT INTO Numbers(Number)
VALUES (1), (2), (3), (4), (5), (6), (7), (8), (9);
SELECT Member, COUNT(*) AS Nr FROM (
SELECT
instance_id,
substring_index(
substring_index(value, ',', Number),
','
, -1
) AS Member
FROM ProjectMembers
JOIN Numbers
ON char_length(value)
- char_length(replace(value, ',', ''))
>= Number - 1
) t
GROUP BY 1
ORDER BY Nr DESC;