版本说明

• 本文是在es8.4.1下进行操作，同时已经安装了ik分词器。
• php操作es的库为​elasticsearch-php，github地址为:
  GitHub - elastic/elasticsearch-php: Official PHP client for Elasticsearch.
• 所有的操作都基于本地服务器进行，本地安装时关闭了安全验证
• index为goods,mapping结构如下:

{"goods": {"mappings": {"properties": {"brand": {"type": "keyword"},"content": {"type": "text","analyzer": "ik_max_word"},"id": {"type": "integer"},"sort": {"type": "integer"},"title": {"type": "text","analyzer": "ik_smart"}}}}
}

• 进行操作时，新建es对象

use Elastic\Elasticsearch\ClientBuilder;
$client = ClientBuilder::create() ->setHosts(['localhost:9200']) ->build();

一些查询操作

我们使用es的情景大部分都是查询，下面列举一些常用的操作场景以及对应的代码

获取mapping结构

$response = $client->indices()->getMapping(['index'=>'goods_bak']);

批量批量插入数据

//$count 为从数据库中取的总数，$result为对应的结果集
for($i = 0; $i < $count; $i++) {$add_params['body'][] = ['index' => ['_index' => "goods",'_id' => ($i+1) . ""],];$add_params['body'][] = ['id' => $result[$i][0] + 1,'title' => $result[$i][1],'content' => $result[$i][2],'sort' => $result[$i][3],'brand' => $result[$i][4],];
}
$responses = $client->bulk($add_params);

删除文档数据

$delete_params = ['index' => 'goods','body' => ['query' => ['range' => ['id' => [//删除id > 1的文档记录'gte' =>1]]]]
];
$responses = $client->deleteByQuery($delete_params);

查询title中包含关键词懒虫的文档记录

// match 会对查询的关键词进行分词，term不会。例如查询华为手机，match会查询title中包含华为或者手机或者华为手机的，term不会对查询的关键词做拆分
//不支持对多个字段进行同时查询
//es默认返回10条记录，可以用from(偏移量)和size(pagesize)进行分页
$params = ['index' => 'goods','body'  => ['query' => ['term' => [
//            'match' => ['title' => '懒虫天鹅']]],'from' => 0, //分页的位置'size' => 20 //返回多少条
];$response = $client->search($params)->asArray();

模糊查询之wildcard、前缀查询

$params = ['index' => 'goods','body'  => ['query' => [//wildcard会对查询条件进行分词，后面可以接* ? 通配符进行匹配// prefix前缀匹配，匹配到分词中以设置的关键词开头的分词
//            'wildcard' => ['prefix' => ['brand' => '星']]],'from' => 0,'size' => 20
];

范围查询

$params = ['index' => 'goods','body'  => ['query' => ['range' => ['sort' => ['gte' => 10,'lte' => 100,]]]],'from' => 0,'size' => 20
];

bool查询

//bool查询，多个条件共同成立，有四种选择，must(计算得分，性能较低) filter(过滤条件，不计算得分，性能高)，must_not(条件必须不成立),should（条件可以成立）//查询title包含懒虫且brand中含有华为的文档记录
$params = ['index' => 'goods','body'  => ['query'=>['bool' => ['filter' => [//多个筛选条件时，每个term是数组形式['term' => ['title' => '懒虫',]],['term' => ['brand' =>'华为',]]]]]],'from' => 0,'size' => 30
];

多个字段不同关键词查询的并集操作

$params = ['index' => 'goods','body'  => ['query'=>[//查询title包含懒虫或者brand包含华为的文档记录'dis_max' => ['queries' => [//多个筛选条件时，每个term是数组形式['term' => ['title' => '懒虫',]],['term' => ['brand' =>'华为',]]]]],//对结果进行聚合操作'aggs' => [//最大得分的记录，返回的结果字段为max_sort'max_sort' => ['max' => ['field' => 'sort']],//对查询结果按brand进行聚合汇总，取出前size条记录'goods_brand_rank' => ['terms' => ['field' => 'brand','size' => 10]]],//对结果进行高亮显示'highlight' => [//这里定义高亮显示的字段以及高亮显示的tag，前端拿到tag后进行处理'fields' => ['title' => ['pre_tags' => '<font color="red">','post_tags' => '</font>',]]]],'from' => 0,'size' => 30
];

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