如何在 PHP 的 ElasticSearch 查询中使用 SQL AND 条件？

Question

我正在通过以下https://qbox.io/blog/using-elasticsearch-in-e-commerce-part-1 文章学习 ElasticSearch。通过运行以下 CURL 命令创建了 elasticsearch 的索引和类型。

curl -XPOST 'localhost:9200/ecomercedata/gadgets/_bulk?pretty' -d'
{ "index": { "_id": 1 }}
{ "name" : "MacBook Pro", "category" : "Laptop", "brand" : "Apple", "rating" : 9, "prize" :  1299.00, "piecesSold" : 9500,  "dateOfRelease" : "2005-02-01"}
{ "index": { "_id": 2 }}
{"name" : "MacBook Air",  "category" : "Laptop", "brand" : "Apple",  "rating" : 8,  "prize" :  1099.00,  "piecesSold" : 8700,   "dateOfRelease" : "2006-05-01"}
{ "index": { "_id": 3 }}
{"name" : "ATIV Book",  "category" : "Laptop",  "brand" : "Samsung",  "rating" : 8,  "prize" :  1899.00,  "piecesSold" : 3500,   "dateOfRelease" : "2014-05-01"}
{ "index": { "_id": 4 }}
{"name" : "Inspiron",  "category" : "Laptop",  "brand" : "Dell",  "rating" : 6,  "prize" :  700.00,  "piecesSold" : 4600,   "dateOfRelease" : "2008-03-01"}
{ "index": { "_id": 5 }}
{"name" : "Ipad",  "category" : "Tablet",  "brand" : "Apple",  "rating" : 9,  "prize" :  600.00,  "piecesSold" : 9500 ,  "dateOfRelease" : "2005-07-01"}
{ "index": { "_id": 6 }}
{"name" : "Galaxy Tab",  "category" : "Tablet",  "brand" : "Samsung",  "rating" : 8,  "prize" :  550.00,  "piecesSold" : 8500 ,  "dateOfRelease" : "2007-07-01"}
{ "index": { "_id": 7 }}
{"name" : "Lumia",  "category" : "Mobile",  "brand" : "Nokia",  "rating" : 6,  "prize" :  50.00,  "piecesSold" : 12000 ,  "dateOfRelease" : "2009-03-01"}
{ "index": { "_id": 8 }}
{"name" : "Iphone",  "category" : "Mobile", "brand" : "Apple",  "rating" : 8,  "prize" :  60.00,  "piecesSold" : 28000 ,  "dateOfRelease" : "2002-03-01"}
{ "index": { "_id": 9 }}
{"name" : "Xperia",  "category" : "Mobile",  "brand" : "Sony",  "rating" : 8,  "prize" :  70.00,  "piecesSold" : 24000 ,  "dateOfRelease" : "2004-03-01"}'

使用的字段映射脚本-

curl -X PUT "http://localhost:9200/ecomercedata/gadgets/_mapping" -d '{
  "gadgets" : {
    "properties" : {
      "category" : {
        "type" : "String",
    "index" : "not_analyzed"
      },
      "brand" : {
        "type" : "String",
    "index" : "not_analyzed"
      },
      "name" : {
        "type" : "String"
      },
      "rating" : {
        "type" : "Integer"
      },
      "dateOfRelease" : {
        "type" : "date",
        "format" : "YYYY-mm-dd"
      },
      "prize" :  {
        "type" : "Double"
      },
      "piecesSold" : {
        "type" : "Integer"
      }
    }
  }
}'

我正在使用 PHP 从 ElasticSearch 中获取记录。这是我的 PHP 脚本。

<?php
require 'vendor/autoload.php';

$hosts = [
    'http://localhost:9200',        // SSL to localhost
];

$client = Elasticsearch\ClientBuilder::create()     // Instantiate a new ClientBuilder
                    ->setHosts($hosts)              // Set the hosts
                    ->build();

$params = [
            'index' => 'ecomercedata',
            'type' => 'gadgets',
            'body' => [
                'query' => [
                        'constant_score' => [
                            'filter' => [
                                'bool' => [
                                    'must' => [
                                        'term' => [
                                            'category' => 'Laptop'
                                        ],
                                        'term' => [
                                            'brand' => 'Apple'
                                        ]
                                    ]
                                ]
                            ]
                        ]
                ]

            ]
        ];

try {
    $results = $client->search($params);
} catch (Exception $e) {
    echo 'Caught exception: ',  $e->getMessage(), "\n";
    exit;
}

echo '<pre>';
print_r($results);
echo '</pre>';
?>

基本上，我正在尝试提取category=laptop and brand=Apple 的所有记录。但是，它没有给我正确数量的记录。根据输入的数据集，我应该得到 2 条记录，但我得到 4 条记录。看起来，category and brand 条件就像OR 而不是AND。

我搜索了很多。但是，无法弄清楚我做错了什么。

Answer 1

您需要将每个term 查询包装在其自己的关联数组中，否则其中一个会被另一个覆盖。试试这个查询。

$params = [
        'index' => 'ecomercedata',
        'type' => 'gadgets',
        'body' => [
            'query' => [
                    'constant_score' => [
                        'filter' => [
                            'bool' => [
                                'must' => [
                                   [
                                    'term' => [
                                        'category' => 'Laptop'
                                    ]
                                   ],
                                   [
                                    'term' => [
                                        'brand' => 'Apple'
                                    ]
                                   ]
                                ]
                            ]
                        ]
                    ]
            ]

        ]
    ];

Answer 2

bool 应始终包裹在 query 中，无论它放在哪里。 此外，您的term 查询不正确。它们应该在自己的数组中，如下所示：

[
    'constant_score' => [
        'filter' => [
            'query' => [
                'bool' => [
                    'must' => [
                        [
                            'term' => [
                                'category' => 'Laptop'
                            ]
                        ],
                        [
                            'term' => [
                                'brand' => 'Apple'
                            ]
                        ]
                    ]
                ]
            ]
        ]
    ]
]