【发布时间】:2016-11-24 01:28:58
【问题描述】:
我想在我的 MySQL 数据库中使用关系进行 Elastic Search 地理距离查询。我有一个包含位置数据的表,然后我有另一个与位置表有关系的表。我知道像 Elastic Search 这样的 NoSQL 数据库并没有针对这种关系进行优化,但有可能吗?
这是我的数据库架构的样子:
CREATE TABLE `locations` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`description` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`lng` decimal(12,8) NOT NULL,
`lat` decimal(12,8) NOT NULL,
`deleted_at` timestamp NULL DEFAULT NULL,
`created_at` timestamp NULL DEFAULT NULL,
`updated_at` timestamp NULL DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=26 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE `posts` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`author` int(10) unsigned NOT NULL,
`location_id` int(10) unsigned NOT NULL,
`title` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`text` text COLLATE utf8_unicode_ci NOT NULL,
`deleted_at` timestamp NULL DEFAULT NULL,
`created_at` timestamp NULL DEFAULT NULL,
`updated_at` timestamp NULL DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `posts_author_foreign` (`author`),
KEY `posts_location_id_foreign` (`location_id`),
CONSTRAINT `posts_author_foreign` FOREIGN KEY (`author`) REFERENCES `users` (`id`),
CONSTRAINT `posts_location_id_foreign` FOREIGN KEY (`location_id`) REFERENCES `locations` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=174 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
CREATE TABLE `comments` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`post_id` int(10) unsigned NOT NULL,
`author` int(10) unsigned NOT NULL,
`title` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`text` text COLLATE utf8_unicode_ci NOT NULL,
`deleted_at` timestamp NULL DEFAULT NULL,
`created_at` timestamp NULL DEFAULT NULL,
`updated_at` timestamp NULL DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `comments_author_foreign` (`author`),
KEY `comments_post_id_foreign` (`post_id`),
CONSTRAINT `comments_author_foreign` FOREIGN KEY (`author`) REFERENCES `users` (`id`),
CONSTRAINT `comments_post_id_foreign` FOREIGN KEY (`post_id`) REFERENCES `posts` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=238 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
这是我的索引映射(我使用official Elasticsearch client for PHP):
<?php
return [
'index' => 'foodie',
'body' => [
'mappings' => [
'locations' => [
'properties' => [
'id' => ['type' => 'string', 'index' => 'not_analyzed'],
'name' => ['type' => 'string'],
'description' => ['type' => 'string'],
'location' => ['type' => 'geo_point'],
],
],
'posts' => [
'properties' => [
'id' => ['type' => 'string', 'index' => 'not_analyzed'],
'author' => ['type' => 'string', 'index' => 'not_analyzed'],
'location_id' => ['type' => 'string', 'index' => 'not_analyzed'],
'title' => ['type' => 'string'],
'text' => ['type' => 'string'],
],
],
'comments' => [
'properties' => [
'id' => ['type' => 'string', 'index' => 'not_analyzed'],
'author' => ['type' => 'string', 'index' => 'not_analyzed'],
'post_id' => ['type' => 'string', 'index' => 'not_analyzed'],
'title' => ['type' => 'string'],
'text' => ['type' => 'string'],
],
]
],
'settings' => [
'analysis' => [
'filter' => [
],
'analyzer' => [
],
],
],
],
];
我想查询位置和帖子(以及评论(= 两个连接),如果这对性能来说还不错的话),我可以按地理距离进行过滤和排序。
我尝试过这样的查询:
[
'index' => 'index_name',
'type' => [
0 => 'posts',
1 => 'locations',
2 => 'comments'
],
'body' => [
'from' => 0,
'size' => 10,
'query' => [
'bool' => [
'must' => [
'multi_match' => [
'query' => 'search string',
'fields' => [
0 => 'title',
1 => 'text',
2 => 'name',
3 => 'description',
],
'fuzziness' => 'AUTO',
'operator' => 'and',
],
],
'filter' => [
'geo_distance' => [
'distance' => '100m',
'location' => [
'lat' => 79.861,
'lon' => 107.31,
],
],
],
],
],
],
]
它有效,但显然会过滤掉除具有位置数据的位置之外的所有内容。如何将相关帖子甚至可能包括 cmets 包含到查询中?
谢谢!
【问题讨论】:
-
如您所述,大多数 NoSQL 数据存储倾向于避免使用关系模型。但是,无论如何,您都在尝试对它们应用关系模型。文档数据存储(例如 MongoDB 和 Elasticsearch)因denormalizing 数据而蓬勃发展,因此只有一个地方可以查看。如果您有效地对数据进行了连接并将其转储到单个文档中(因此帖子将包含一个 cmets 数组),那么这将提供所需的行为。或者,您可能希望将帖子作为父级,将 cmets 作为子级的父/子文档。
-
是的,谢谢您的意见。我认为像我所做的那样对数据进行非规范化是一个很好的解决方案。
标签: php mysql database elasticsearch