单个查询中的MySQL项及其属性

我创建了MySQL数据模型来存储内容及其自定义属性/字段。下面是它的简化版本

一个用于存储内容：

CREATE TABLE `cms_content` (
  `id` int(11) NOT NULL,
  `title` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
  `content_type_id` int(6) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

ALTER TABLE `cms_content`
  ADD PRIMARY KEY (`id`),
  ADD KEY `content_type_id` (`content_type_id`);

第二个用于内容类型（如文章、电影、人物）：

自定义字段：

CREATE TABLE `cms_custom_field` (
  `id` int(11) NOT NULL,
  `name` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
  `content_type_id` int(6) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

ALTER TABLE `cms_custom_field`
  ADD PRIMARY KEY (`id`),
  ADD UNIQUE KEY `name` (`name`,`content_type_id`),
  ADD KEY `name_2` (`name`);

最后一个用于连接自定义字段和数据：

CREATE TABLE `cms_content_data` (
  `id` int(11) NOT NULL,
  `custom_field_id` int(11) NOT NULL,
  `content_id` int(11) NOT NULL,
  `value` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
  `value_content_id` int(11) DEFAULT NULL,
  `value_taxonomy_value_id` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

ALTER TABLE `cms_content_data`
  ADD PRIMARY KEY (`id`),
  ADD UNIQUE KEY `key` (`value`,`content_id`,`custom_field_id`) USING BTREE,
  ADD KEY `content_id` (`content_id`),
  ADD KEY `custom_field_id` (`custom_field_id`),
  ADD KEY `value` (`value`),
  ADD KEY `value_content_id` (`value_content_id`),
  ADD KEY `value_taxonomy_value_id` (`value_taxonomy_value_id`),
  ADD KEY `custom_field_id_2` (`custom_field_id`,`content_id`);

挑战

我需要创建一个查询来获取特定类型的内容及其所有自定义字段。 注意！这里的一个技巧是，一个自定义字段可以有多个

content\u数据

值。 例如，一部电影有一个字段

类型

，它可以在

内容\u数据

中有多行

非工作查询

我能够动态生成以下查询：

SELECT 
`content`.`id` AS `_content_id`, 
`content`.`title` AS `_content_title`, 
`content_data_0`.`value_taxonomy_value_id` AS `genres`, 
`content_data_1`.`value_content_id` AS `production_company`, 
`content_data_2`.`value` AS `date_released`, 
`content_data_3`.`value` AS `runtime`, 
`content_data_4`.`value` AS `tagline`, 
`content_data_5`.`value` AS `imdb_rating`, 
`content_data_6`.`value` AS `rt_rating`, 
`content_data_7`.`value` AS `imdb_id`, 
`content_data_8`.`value` AS `trailer_url`, 
`content_data_9`.`value` AS `api_id`, 
`content_data_10`.`value_taxonomy_value_id` AS `rating`, 
`content_data_11`.`value` AS `revenue`, 
`content_data_12`.`value` AS `poster_original_path`, 
`content_data_13`.`value` AS `rt_rating_users`, 
`content_data_14`.`value` AS `rt_url`, 
`content_data_15`.`value` AS `rt_consensus`, 
`content_data_16`.`value` AS `mc_rating`, 
`content_data_17`.`value` AS `year`, 
`content_data_18`.`value` AS `budget`, 
`content_data_19`.`value_taxonomy_value_id` AS `original_language`, 
`content_data_20`.`value_taxonomy_value_id` AS `production_countries`, 
`content_data_21`.`value` AS `original_title` 
FROM `cms_content` AS `content` 
INNER JOIN cms_content_type ON cms_content_type.id = content.content_type_id
INNER JOIN `cms_content_data` AS `content_data_0` ON `content_data_0`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_1` ON `content_data_1`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_2` ON `content_data_2`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_3` ON `content_data_3`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_4` ON `content_data_4`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_5` ON `content_data_5`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_6` ON `content_data_6`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_7` ON `content_data_7`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_8` ON `content_data_8`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_9` ON `content_data_9`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_10` ON `content_data_10`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_11` ON `content_data_11`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_12` ON `content_data_12`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_13` ON `content_data_13`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_14` ON `content_data_14`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_15` ON `content_data_15`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_16` ON `content_data_16`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_17` ON `content_data_17`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_18` ON `content_data_18`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_19` ON `content_data_19`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_20` ON `content_data_20`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_data` AS `content_data_21` ON `content_data_21`.`content_id` = `content`.`id` 
INNER JOIN `cms_content_type` AS `content_type` ON `content_type`.`id` = `content`.`content_type_id` 

WHERE `content_type`.`name` = 'movie' 
AND `content_data_0`.`custom_field_id` = 141 
AND `content_data_1`.`custom_field_id` = 143 
AND `content_data_2`.`custom_field_id` = 144 
AND `content_data_3`.`custom_field_id` = 146
AND `content_data_4`.`custom_field_id` = 148 
AND `content_data_5`.`custom_field_id` = 154 
AND `content_data_6`.`custom_field_id` = 155 
AND `content_data_7`.`custom_field_id` = 156 
AND `content_data_8`.`custom_field_id` = 158 
AND `content_data_9`.`custom_field_id` = 159 
AND `content_data_10`.`custom_field_id` = 162 
AND `content_data_11`.`custom_field_id` = 163 
AND `content_data_12`.`custom_field_id` = 164 
AND `content_data_13`.`custom_field_id` = 174 
AND `content_data_14`.`custom_field_id` = 175 
AND `content_data_15`.`custom_field_id` = 176 
AND `content_data_16`.`custom_field_id` = 177 
AND `content_data_17`.`custom_field_id` = 185 
AND `content_data_18`.`custom_field_id` = 184 
AND `content_data_19`.`custom_field_id` = 186 
AND `content_data_20`.`custom_field_id` = 187 
AND `content_data_21`.`custom_field_id` = 188 
DESC LIMIT 100

这里的问题是： 1.返回错误。显然，由于每个

content\u数据可以有多个值，MySQL以各种方式将它们组合在一起，最后我得到了一个
movie
和各种自定义字段组合。
2.查询速度非常慢（可能是因为许多联接以及字段值的组合）

问题

MySQL（当然还有一些PHP后端魔术）中有没有任何方法可以在一个查询中返回所有必需的数据？考虑到当前的数据模型

对于多行，在逗号分隔的字段值中使用值对我来说是可行的（除非有更好的方法）

或者这个数据模型只是有缺陷，我需要以某种方式对其进行更改

提前谢谢
 您需要条件聚合。我认为这是：

SELECT c.id as `_content_id`, 
       c.title AS `_content_title`,
FROM content c LEFT JOIN
     (SELECT ct.content_id,
             MAX(CASE WHEN ct.custom_field_id = 141 THEN ct.value_taxonomy_value_id END as genres,
             MAX(CASE WHEN ct.custom_field_id = 143 THEN ct.value_taxonomy_value_id END as production_company,
             MAX(CASE WHEN ct.custom_field_id = 144 THEN ct.value END as date_released,
             . . .
      FROM cms_content_type ct
      GROUP BY ct.content_id
     ) ct
     ON ct.content_id = c.contentId;

注意：
value
并没有用于所有列，这似乎很奇怪。如果给定的
内容\u id
有多行，且具有相同的
客户字段\u id
，则可能需要
组\u CONCAT（）。使用这种技术，需要一个连接，然后条件聚合表达式提取期望值

对于您的quer，它看起来像：

SELECT 
    c.id content_id
    c.title content_title,
    MAX(CASE WHEN d.custom_field_id = 141 THEN d.value END) genres,
    MAX(CASE WHEN d.custom_field_id = 143 THEN d.value END) production_company,
    MAX(CASE WHEN d.custom_field_id = 144 THEN d.value END) date_released
    ...
FROM cms_content c
INNER JOIN cms_content_type t ON t.id = c.content_type_id
INNER JOIN cms_content_data d ON d.content_id = c.id 
WHERE t.name = 'movie' 
GROUP BY c.id, c.title

内容真的可以有多种类型吗？什么是
value\u content\u id
和
value\u taxonomy\u value\u id
？@Nick 1）对一种内容类型进行一次查询2）值是自由格式文本（例如标题、正文、日期），值\u content\u id与另一种
内容相关，值\u taxonomy\u id与分类相关（例如，提供多种选择的类型）。我提出后者并不是为了简化问题。现在您可以看到EAV架构模式有多么糟糕。是的，这解决了结果问题，但查询本身仍然非常慢。即使使用了所有索引。我猜，我只需要进行第二次查询。无论如何，谢谢！是的，这解决了结果问题，但查询本身仍然非常慢。Even和所有索引。猜猜，我只需要进行第二次查询。不过谢谢你的帮助！
SELECT 
    c.id content_id
    c.title content_title,
    MAX(CASE WHEN d.custom_field_id = 141 THEN d.value END) genres,
    MAX(CASE WHEN d.custom_field_id = 143 THEN d.value END) production_company,
    MAX(CASE WHEN d.custom_field_id = 144 THEN d.value END) date_released
    ...
FROM cms_content c
INNER JOIN cms_content_type t ON t.id = c.content_type_id
INNER JOIN cms_content_data d ON d.content_id = c.id 
WHERE t.name = 'movie' 
GROUP BY c.id, c.title