ES基础入门

1、ES倒排索引

数据库记录 DOCID代表主键

ES倒排索引 （二次查找）

a、对搜索的字段进行分词，关键词映射到对应数据库主键

 

 

 b、ES对关键词进行分词，例如搜索”苹果手机“被分为”苹果“和”手机“

 

 苹果匹配度>手机匹配度，ES根据匹配结果做排序，最终搜索结果展示

 

 

2、ES概念

 

 

 INDEX: 相当于表

 DOC: JSON对象

 FIED: JSON对象的字段

MAPPING：DOC的JSON结构

 

3、测试

curl -X POST "localhost:9200/_analyze?pretty" -H 'Content-Type: application/json' -d '{ "analyzer": "ik_smart", "text": "中国人民共和国" }'  #验证分词功能

　　

创建INDEX

PUT http://192.168.110.128:9200/sku HTTP/1.1
User-Agent: Fiddler
Host: 192.168.110.128:9200
Content-Type: application/json
Content-Length: 441

{
        "mappings": {
                "properties": {
                        "sku_id": {
                                "type": "long"
                        },
                        "title": {
                                "type": "text",
                                "analyzer": "ik_max_word",
                                "search_analyzer": "ik_max_word"
                        }
                }
        }
}

HTTP/1.1 200 OK
content-type: application/json; charset=UTF-8
content-length: 62

{"acknowledged":true,"shards_acknowledged":true,"index":"sku"}

插入DOC

POST http://192.168.110.128:9200/sku/_doc/ HTTP/1.1
User-Agent: Fiddler
Host: 192.168.110.128:9200
Content-Type: application/json
Content-Length: 112

{ "sku_id": 100002860826, "title": "烟台红富士苹果 5kg 一级铂金大果 单果230g以上 新鲜水果"}

POST http://192.168.110.128:9200/sku/_doc/ HTTP/1.1
User-Agent: Fiddler
Host: 192.168.110.128:9200
Content-Type: application/json
Content-Length: 125

{ "sku_id": 100000177760, "title": "苹果 Apple iPhone XS Max (A2104) 256GB 金色 移动联通电信4G手机 双卡双待"}

关键词查询

POST http://192.168.110.128:9200/sku/_search?pretty HTTP/1.1
User-Agent: Fiddler
Host: 192.168.110.128:9200
Content-Type: application/json
Content-Length: 54

{ "query" : { "match" : { "title" : "苹果手机" }}}

HTTP/1.1 200 OK
content-type: application/json; charset=UTF-8
content-length: 891

{
  "took" : 533,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 2,
      "relation" : "eq"
    },
    "max_score" : 0.8594865,
    "hits" : [
      {
        "_index" : "sku",
        "_type" : "_doc",
        "_id" : "uHyovYABUSVWsq2vBibk",
        "_score" : 0.8594865,
        "_source" : {
          "sku_id" : 100000177760,
          "title" : "苹果 Apple iPhone XS Max (A2104) 256GB 金色 移动联通电信4G手机 双卡双待"
        }
      },
      {
        "_index" : "sku",
        "_type" : "_doc",
        "_id" : "t3ynvYABUSVWsq2v0yZU",
        "_score" : 0.18577608,
        "_source" : {
          "sku_id" : 100002860826,
          "title" : "烟台红富士苹果 5kg 一级铂金大果 单果230g以上 新鲜水果"
        }
      }
    ]
  }
}