当前位置: 首页>数据库>正文

es 中文搜索 精确匹配 Java es搜索类型

 

elasticsearch有六种搜索方式:

1、query string search
2、query DSL
3、query filter
4、full-text search
5、phrase search
6、highlight search

 

 

1、query string search

 

搜索全部商品:GET /ecommerce/product/_search

 

took:耗费了几毫秒

timed_out:是否超时,这里是没有

_shards:数据拆成了5个分片,所以对于搜索请求,会打到所有的primary shard(或者是它的某个replica shard也可以)

hits.total:查询结果的数量,3个document

hits.max_score:score的含义,就是document对于一个search的相关度的匹配分数,越相关,就越匹配,分数也高

hits.hits:包含了匹配搜索的document的详细数据

{
  "took": 2,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 3,
    "max_score": 1,
    "hits": [
      {
        "_index":"ecommerce",
        "_type": "product",
        "_id": "2",
        "_score": 1,
        "_source": {
          "name": "jiajieshiyagao",
          "desc": "youxiaofangzhu",
          "price": 25,
          "producer": "jiajieshiproducer",
          "tags": [
            "fangzhu"
          ]
        }
      },
      {
        "_index":"ecommerce",
        "_type": "product",
        "_id": "1",
        "_score": 1,
        "_source": {
          "name": "gaolujieyagao",
          "desc": "gaoxiaomeibai",
          "price": 30,
          "producer": "gaolujieproducer",
          "tags": [
            "meibai",
            "fangzhu"
          ]
        }
      },
      {
        "_index":"ecommerce",
        "_type": "product",
        "_id": "3",
        "_score": 1,
        "_source": {
          "name": "zhonghuayagao",
          "desc": "caobenzhiwu",
          "price": 40,
          "producer": "zhonghuaproducer",
          "tags": [
            "qingxin"
          ]
        }
      }
    ]
  }
}

query string search的由来,因为search参数都是以http请求的query string来附带的

 

搜索商品名称中包含yagao的商品,而且按照售价降序排序:

GET/ecommerce/product/_search?q=name:yagao&sort=price:desc

 

适用于临时的在命令行使用一些工具,比如curl,快速的发出请求,来检索想要的信息;但是在生产环境中,几乎很少使用query string search,因为他把所有的请求参数都弄在了query string 里如果查询请求很复杂,是很难去构建的

 

 

2、query DSL

 

DSL:Domain Specified Language,特定领域的语言

http request body:请求体,可以用json的格式来构建查询语法,比较方便,可以构建各种复杂的语法,比query string search肯定强大多了

 

查询所有的商品 

GET/ecommerce/product/_search
{
}

 

查询名称包含yagao的商品,同时按照价格降序排序

GET/ecommerce/product/_search
{
    "query" : {
        "match" : {
            "name" :"yagao"
        }
    },
    "sort": [
        { "price": "desc" }
    ]
}

分页查询商品,总共3条商品,假设每页就显示1条商品,现在显示第2页,所以就查出来第2个商品 

GET/ecommerce/product/_search
{
  "query": { "match_all":{} },
  "from": 1,
  "size": 1
}

指定要查询出来商品的名称和价格就可以

GET/ecommerce/product/_search
{
  "query": { "match_all":{} },
  "_source": ["name","price"]
}

更加适合生产环境的使用,可以构建复杂的查询

 

3、query filter

对数据进行过滤

搜索商品名称包含yagao,而且售价大于25元的商品

 

GET/ecommerce/product/_search
{
    "query" : {
        "bool" : {
            "must" : {
                "match" : {
                    "name" :"yagao" 
                }
            },
            "filter" : {
                "range" : {
                    "price" : {"gt" : 25 } 
                }
            }
        }
    }
}

 

注API:

"bool"   --->   查询条件
 "must"    --->   必须匹配
 "filter"   --->     过滤
 "range"    --->  范围
“gt”     --->   ">"
“gte”     --->   ">="
“It”     --->   "<"
“Ite”     --->   "<="
4、full-text search(全文检索)
GET/ecommerce/product/_search
{
    "query" : {
        "match" : {
            "producer" : "yagaoproducer"
        }
    }
}

producer这个字段,会先被拆解,建立倒排索引 

special        4
yagao            4
producer        1,2,3,4
gaolujie        1
zhognhua        3
jiajieshi          2

yagaoproducer

{
  "took": 4,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 4,
    "max_score": 0.70293105,
    "hits": [
      {
        "_index":"ecommerce",
        "_type": "product",
        "_id": "4",
"_score":0.70293105,
        "_source": {
          "name": "specialyagao",
          "desc": "specialmeibai",
          "price": 50,
"producer": "special yagaoproducer",
          "tags": [
            "meibai"
          ]
        }
      },
      {
        "_index":"ecommerce",
        "_type": "product",
        "_id": "1",
        "_score":0.25811607,
        "_source": {
          "name": "gaolujieyagao",
          "desc": "gaoxiaomeibai",
          "price": 30,
"producer": "gaolujieproducer",
          "tags": [
            "meibai",
            "fangzhu"
          ]
        }
      },
      {
        "_index":"ecommerce",
        "_type": "product",
        "_id": "3",
        "_score":0.25811607,
        "_source": {
          "name": "zhonghuayagao",
          "desc": "caobenzhiwu",
          "price": 40,
"producer": "zhonghuaproducer",
          "tags": [
            "qingxin"
          ]
        }
      },
      {
        "_index":"ecommerce",
        "_type": "product",
        "_id": "2",
        "_score":0.1805489,
        "_source": {
          "name": "jiajieshiyagao",
          "desc": "youxiaofangzhu",
          "price": 25,
"producer": "jiajieshi producer",
          "tags": [
            "fangzhu"
          ]
        }
      }
    ]
  }
}
5、phrase search(短语搜索)

 

跟全文检索相对应,相反,

全文检索会将输入的搜索串拆解开来,去倒排索引里面去一一匹配,只要能匹配上任意一个拆解后的单词,就可以作为结果返回

phrase search,要求输入的搜索串,必须在指定的字段文本中,完全包含一模一样的,才可以算匹配,才能作为结果返回

 

GET/ecommerce/product/_search
{
    "query" : {
 "match_phrase": {
yagao producer"
        }
    }
}
{
  "took": 11,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 1,
    "max_score": 0.70293105,
    "hits": [
      {
        "_index":"ecommerce",
        "_type": "product",
        "_id": "4",
        "_score": 0.70293105,
        "_source": {
          "name": "specialyagao",
          "desc": "specialmeibai",
          "price": 50,
yagao producer",
          "tags": [
            "meibai"
          ]
        }
      }
    ]
  }
}

 

6、highlight search(高亮搜索结果)

GET/ecommerce/product/_search

{

  "query": {

    "match_phrase": {

      "producer":"gaolujie"

    }

  },

  "highlight": {

    "fields": {

      "producer": {}

    }

 }

}

 

 

 

{

  "took": 61,

  "timed_out": false,

  "_shards": {

    "total": 5,

    "successful": 5,

    "failed": 0

  },

  "hits": {

    "total": 1,

    "max_score": 0.25811607,

    "hits": [

      {

        "_index":"ecommerce",

        "_type": "product",

        "_id": "1",

        "_score": 0.25811607,

        "_source": {

          "name":"lianxiaobaolianxiaobao aibili",

          "desc": "gaoxiaomeibai",

          "price": 30,

          "producer": "gaolujieproducer",

          "tags": [

            "meibai",

            "fangzhu"

          ]

        },

        "highlight": {

          "producer": [

            "<em>gaolujie</em>producer"

          ]

        }

      }

    ]

  }

}

https://www.xamrdz.com/database/67e1961146.html

相关文章: