编辑:很抱歉造成混淆。刚刚得到老板的同意,可以发布这部分模式。如果我被允许发布一张图片,我会在最初的帖子中有更多的细节。
我有一个配置模式,看起来像这样:
http://img717.imageshack.us/img717/7297/heirarchy.png
每个级别都包含在其下的级别中(即-合作伙伴有多个程序),每个配置级别与其他类型的配置级别共享配置键(即-可以在合作伙伴级别设置默认时区,然后从程序、投资组合或设备级别覆盖)。
这允许我们为一种类型的对象设置一个默认值,然后用更具体的分类法覆盖它。例如:
假设我有一个合作伙伴对象是一家公司。假设hierarchy_configuration_key 1是默认时区。我放了一个合作伙伴配置,上面写着,大多数情况下,该合作伙伴将位于东海岸(纽约时间)。
现在我有多个合作伙伴支持的项目。假设这个特定的项目是以加利福尼亚州为基地的。我放了一个程序配置,上面写着该程序中的设备是萨克拉门托时间。
现在,让我们跳过投资组合,说有人在加州以外的地方注册了这个项目,搬到了丹佛,但仍然是一个客户。我们设置了一个设备配置,显示它们现在处于山地时间。
层次结构如下:
Level |Timezone (hierarchy_configuration_key 1)
---------------------------------------------------
Partner |NYC
Program |Sacramento
Portfolio |null (defaults to most granular above it, so Sacramento)
Device |Denver
现在我想选择按hierarchy_configuration_key_id:分组的配置
我可以使用内部联接来遍历级别,但我希望通过选择来为设备的主键(device_id)提供这样的结果(按hierarchy_configuration_key_id分组):
device_id |portfolio_id |program_id |partner_id |device_config |portfolio_config |program_config| partner_config
---------------------------------------------------------------------------------------------------------------------
1 |2 |1 |35 |Denver |null |Sacramento | NYC
同样可以接受的是一个选择,它只给了我最相关的配置值,即:
device_id |portfolio_id |program_id |partner_id |config_value
-------------------------------------------------------------
1 |2 |1 |35 |Denver
提前谢谢。如果你需要更多的澄清,请告诉我。
我认为@EugenRieck的评论指出了这里唯一不起作用的部分
-Which field tells the Miata it is a Child of Mazda?
我会稍微改变一下结构。。。
ENTITY_TABLE
entity_id | parent_entity_id | entity_name
1 NULL Vehicle
2 1 Car
3 2 Mazda
4 3 Miata
5 1 Cycle
6 5 Unicycle
7 6 Broken Unicycle
PROPERTY_TABLE
entity_id | property_type | value
1 Wheels 4
2 Wheels NULL
3 Wheels NULL
4 Wheels NULL
5 Wheels 2
6 Wheels 1
7 Wheels 0
(And repeated for other property types as appropriate)
-- Every entity must have the same properties as the parents
-- (otherwise you have to find the topmost parent first to know what properties exist)
-- An entity may only have 1 parent
-- The topmost parent must have a NULL parent_id
-- The bottommost parent must be no more than 3 joins away from the topmost parent
然后你可以吃这样的东西。。。
SELECT
entity1.id,
property1.property_type,
entity1.name,
entity2.name,
entity3.name,
entity4.name,
property1.value,
property2.value,
property3.value,
property4.value,
COALESCE(property1.value, property2.value, property3.value, property4.value) AS inherited_value
FROM
entity AS entity1
LEFT JOIN
entity AS entity2
ON entity2.id = entity1.parent_id
LEFT JOIN
entity AS entity3
ON entity3.id = entity2.parent_id
LEFT JOIN
entity AS entity4
ON entity4.id = entity3.parent_id
INNER JOIN
property AS property1
ON property1.entity_id = entity1.id
LEFT JOIN
property AS property2
ON property2.entity_id = entity2.id
AND property2.property_type = property1.property_type
LEFT JOIN
property AS property3
ON property3.entity_id = entity3.id
AND property3.property_type = property1.property_type
LEFT JOIN
property AS property4
ON property4.entity_id = entity4.id
AND property4.property_type = property1.property_type
WHERE
entity1.id = @entity_id
AND property1.property_type = @property_type
此解决方案基于您的架构,@param1是hierarchy_configuration_key_id,@param2是所需的设备_id。它使用了一种类似于民主党的方法,尽管它是独立得出的,只是我借用了COALESCE。
SELECT *,
IF(dv_key IS NOT NULL,'device',IF(pf_key IS NOT NULL,'portfolio',IF(pg_key IS NOT NULL,'program',IF(pt_key IS NOT NULL,'partner',NULL)))) AS hierarchy_level,
COALESCE(dv_key,pf_key,pg_key,pt_key) AS key_id,
COALESCE(dv_value,pf_value,pg_value,pt_value) AS value
FROM
(SELECT sim_id,
dv.device_id, pt.partner_id, pg.program_id, pf.portfolio_id,
dvc.hierarchy_configuration_key_id AS dv_key, dvc.configuration_value AS dv_value,
pfc.hierarchy_configuration_key_id AS pf_key, pfc.configuration_value AS pf_value,
pgc.hierarchy_configuration_key_id AS pg_key, pgc.configuration_value AS pg_value,
ptc.hierarchy_configuration_key_id AS pt_key, ptc.configuration_value AS pt_value
FROM device dv
LEFT JOIN portfolio pf USING(portfolio_id)
LEFT JOIN program pg USING(program_id)
LEFT JOIN partner pt USING(partner_id)
LEFT JOIN device_configuration dvc ON dv.device_id=dvc.device_id AND dvc.hierarchy_configuration_key_id=@param2 AND dvc.active='true'
LEFT JOIN portfolio_configuration pfc ON pf.portfolio_id=pfc.portfolio_id AND pfc.hierarchy_configuration_key_id=@param2 AND pfc.active='true'
LEFT JOIN program_configuration pgc ON pg.program_id=pgc.program_id AND pgc.hierarchy_configuration_key_id=@param2 AND pgc.active='true'
LEFT JOIN partner_configuration ptc ON pt.partner_id=ptc.partner_id AND ptc.hierarchy_configuration_key_id=@param2 AND ptc.active='true'
WHERE dv.device_id = @param1) hierchy;