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  • 7.ES几种常见的搜索方式

    主要知识点 

    1, query string search

    (1)  GET /ecommerce/product/_search

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

       

    2,query DSL

    (1)GET /ecommerce/product/_search

    {

    "query": { "match_all": {} }

    }

    2)、GET /ecommerce/product/_search

    {

    "query" : {

       "match" : {

          "name" : "yagao"

      }

    },

    "sort": [

    { "price": "desc" } ]

    }

     3)、GET /ecommerce/product/_search

    {

    "query": { "match_all": {} },

    "from": 1, # 从第几个开始查,从0开始

    "size": 1 ,# 查几个

    }

       

    4)、GET /ecommerce/product/_search

    {

    "query": { "match_all": {} },

    "_source": ["name", "price"]

    }

    3query filter

    1)、GET /ecommerce/product/_search

    {

    "query" : {

      "bool" : {

        "must" : {

          "match" : {

            "name" : "yagao"

      }

    },

    "filter" : {

      "range" : {

        "price" : { "gt" : 25 } #大于25

            }

          }

        }

      }

    }

    4, full-text search

    GET /ecommerce/product/_search

    {

    "query" : {

      "match" : {

        "producer" : "yagao producer"

        }

      }

    }

    5, phrase search

    GET /ecommerce/product/_search

    {

    "query" : {

      "match_phrase" : {

        "producer" : "yagao producer"

        }

       }

    }

       

    6, highlight search

    GET /ecommerce/product/_search

    {

    "query" : {

      "match" : {

        "producer" : "producer"

      }

    },

    "highlight": {

      "fields" : {

        "producer" : {}

        }

       }

    }

    • 一 query string search

      1、搜索全部商品

      语法:GET /ecommerce/product/_search

      结果的一些说明:

      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,3document

      hits.max_scorescore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

       结果如下:

      {

      "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": "jiajieshi yagao",

      "desc": "youxiao fangzhu",

      "price": 25,

      "producer": "jiajieshi producer",

      "tags": [

      "fangzhu"

      ]

      }

      },

      数据未展示完,只展示了一条数据

         

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

      2、对搜索的结果集进行排序

      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

         

      这种方式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;但是如果查询请求很复杂,是很难去构建的

      在生产环境中,几乎很少使用query string search

      query DSL

      DSLDomain 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

      语法:

      GET /Index/type/_search

      { "query":{查询体}

      }

      1、查询所有的商品

      GET /ecommerce/product/_search

      {

      "query": { "match_all": {} }

      }

      2、查询名称包含特定词语,同时对结果进行降序排序

      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" } ]

      }

      3、分页查询

      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, # 从第几个开始查,从0开始

      "size": 1 ,# 查几个

      }

      4、只需要特定fileds

      指定要查询出来商品的名称和价格就可以(只显示特定的fileds)

         

      GET /ecommerce/product/_search

      {

      "query": { "match_all": {} },

      "_source": ["name", "price"]

      }

         

      query DSL更加适合生产环境的使用,可以构建复杂的查询

        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 } #大于25

      }

      }

      }

      }

      }

       full-text search(全文检索)

      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,顺序有匹配的相关度从高到底排列.

      查询 producer 里包含"yagao producer"的数据

      GET /ecommerce/product/_search

      {

      "query" : {

      "match" : {

      "producer" : "yagao producer"

      }

      }

      }

          

      producer这个字段,会先被拆解,建立倒排索引

    term

    id

    special 

    4

    yagao

    4

    producer

    1,2,3,4

    gaolujie

    2

    zhognhua

    3

    jiajieshi

    2

       

    搜索词yagao producer 被拆分为yagaoproducer,然后分别去匹配,producer可以匹配1,2,3,4,yagao可以匹配4,所以四条数据均会被查询出来,但是"special yagao producer"在最高头.因为他的相关度最高.

       

    {

    "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": "special yagao",

    "desc": "special meibai",

    "price": 50,

    "producer": "special yagao producer",

    "tags": [

    "meibai"

    ]

    }

    },

    数据未展示全

       

    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" : {

    "producer" : "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": "special yagao",

    "desc": "special meibai",

    "price": 50,

    "producer": "special yagao producer",

    "tags": [

    "meibai"

    ]

    }

    }

    ]

    }

    }

        

    highlight search(高亮搜索结果)

       

    GET /ecommerce/product/_search

    {

    "query" : {

    "match" : {

    "producer" : "producer"

    }

    },

    "highlight": {

    "fields" : {

    "producer" : {}

    }

    }

    }

    结果是

    {

    "took": 66,

    "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": "special yagao",

    "desc": "special meigai",

    "price": 50,

    "producer": "special yagao producer"

    },

    "highlight": {

    "producer": [

    "special <em>yagao</em> <em>producer</em>"

    ]

    }

    },

    最后这一段就表示我们搜索的高亮.

    最后特别说明:

    无论是学什么技术,一定自己动手,特别是手工敲各种命令和代码,切记切记,减少复制粘贴的操作。只有自己动手手工敲,学习效果才最好。

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  • 原文地址:https://www.cnblogs.com/liuqianli/p/8433662.html
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