Elasticsearch 数据查询

数据准备：

PUT /shop
{
  "settings": {
    "number_of_shards": 3,
    "number_of_replicas": 2
  }
}

PUT /shop/_mapping/goods
{
  "properties": {
    "title": {
      "type": "text",
      "analyzer": "ik_max_word"
    },
    "price": {
      "type": "float"
    },
    "stock": {
      "type": "integer"
    }
  }
}

POST /shop/goods/_bulk
{"index":{}}
{"title": "小米8 全面屏游戏智能手机 6GB+64GB 黑色 全网通4G 双卡双待","price": 2299.00,"stock": 8800}
{"index":{}}
{"title": "OPPO Find X曲面全景屏 波尔多红 8GB+128GB 全网通 移动联通电信全网通4G 双卡双待手机","price": 4999.00,"stock": 5600}
{"index":{}}
{"title": "联想(Lenovo)拯救者Y7000P英特尔酷睿 i7 15.6英寸游戏笔记本电脑(i7-8750H 8G 512G SSD GTX1060 144Hz黑)","price": 8599.00,"stock": 1900}
{"index":{}}
{"title": "TP-LINK TL-WDR5620 1200M 5G双频智能无线路由器 四天线智能wifi 稳定穿墙高速家用路由器","price": 109.00,"stock": 9970}

一、基本查询

语法：

GET /索引库名/_search
{
  "query": {
    "查询类型": {
      "查询条件": "查询条件值"
    }
  }
}

查询类型：match_all，match，term，range，fuzzy，bool 等等

查询条件：查询条件会根据类型的不同，写法也有差异

1.1 查询所有（match_all）

查询指令：

GET /shop/_search
{
  "query": {
    "match_all": {}
  }
}

查询结果：

{
  "took": 13,
  "timed_out": false,
  "_shards": {
    "total": 3,
    "successful": 3,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 4,
    "max_score": 1,
    "hits": [
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "P4EGtmgBBdkQnU_d8b7I",
        "_score": 1,
        "_source": {
          "title": "联想(Lenovo)拯救者Y7000P英特尔酷睿 i7 15.6英寸游戏笔记本电脑(i7-8750H 8G 512G SSD GTX1060 144Hz黑)",
          "price": 8599,
          "stock": 1900
        }
      },
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "QIEGtmgBBdkQnU_d-r6T",
        "_score": 1,
        "_source": {
          "title": "TP-LINK TL-WDR5620 1200M 5G双频智能无线路由器 四天线智能wifi 稳定穿墙高速家用路由器",
          "price": 109,
          "stock": 9970
        }
      },
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "PYEGtmgBBdkQnU_d4b4m",
        "_score": 1,
        "_source": {
          "title": "小米8 全面屏游戏智能手机 6GB+64GB 黑色 全网通4G 双卡双待",
          "price": 2299,
          "stock": 8800
        }
      },
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "PoEGtmgBBdkQnU_d6b4Q",
        "_score": 1,
        "_source": {
          "title": "OPPO Find X曲面全景屏 波尔多红 8GB+128GB 全网通 移动联通电信全网通4G 双卡双待手机",
          "price": 4999,
          "stock": 5600
        }
      }
    ]
  }
}

对查询结果进行分页

GET /shop/_search
{
  "query": {
    "match_all": {}
  },
  "from": 1,
  "size": 2
}

1.2 匹配查询（match）

or 关系：会把查询条件进行分词，然后进行查询，多个词条之间是or的关系

查询指令：

GET /shop/_search
{
  "query": {
    "match": {
      "title": {
        "query": "小米手机",
        "operator": "or"
      }
    }
  }
}

查询结果：

{
  "took": 3,
  "timed_out": false,
  "_shards": {
    "total": 3,
    "successful": 3,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 2,
    "max_score": 1.6051829,
    "hits": [
      {
        "_index": "demo",
        "_type": "goods",
        "_id": "MIHNs2gBBdkQnU_d_r6o",
        "_score": 1.6051829,
        "_source": {
          "title": "华为手机",
          "price": "2199.00"
        }
      },
      {
        "_index": "demo",
        "_type": "goods",
        "_id": "LYHJs2gBBdkQnU_dt75n",
        "_score": 0.2876821,
        "_source": {
          "title": "小米手机",
          "price": "1699.00"
        }
      }
    ]
  }
}

and关系：会把查询条件进行分词，然后进行查询,多个词条之间是and的关系

查询指令：

GET /shop/_search
{
  "query": {
    "match": {
      "title": {
        "query": "小米手机",
        "operator": "and"
      }
    }
  }
}

查询结果：

{
  "took": 10,
  "timed_out": false,
  "_shards": {
    "total": 3,
    "successful": 3,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 1,
    "max_score": 0.92355466,
    "hits": [
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "PYEGtmgBBdkQnU_d4b4m",
        "_score": 0.92355466,
        "_source": {
          "title": "小米8 全面屏游戏智能手机 6GB+64GB 黑色 全网通4G 双卡双待",
          "price": 2299,
          "stock": 8800
        }
      }
    ]
  }
}

1.3 词条查询

单值查询（term）

查询指令：

GET /shop/_search
{
  "query": {
    "term": {
      "price": 109.00
    }
  }
}

查询结果：

{
  "took": 3,
  "timed_out": false,
  "_shards": {
    "total": 3,
    "successful": 3,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 1,
    "max_score": 1,
    "hits": [
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "QIEGtmgBBdkQnU_d-r6T",
        "_score": 1,
        "_source": {
          "title": "TP-LINK TL-WDR5620 1200M 5G双频智能无线路由器 四天线智能wifi 稳定穿墙高速家用路由器",
          "price": 109,
          "stock": 9970
        }
      }
    ]
  }
}

多值查询（terms）

查询指令：

GET /shop/_search
{
  "query": {
    "terms": {
      "price": [8599.00,109.00]
    }
  }
}

查询结果：

{
  "took": 15,
  "timed_out": false,
  "_shards": {
    "total": 3,
    "successful": 3,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 2,
    "max_score": 1,
    "hits": [
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "P4EGtmgBBdkQnU_d8b7I",
        "_score": 1,
        "_source": {
          "title": "联想(Lenovo)拯救者Y7000P英特尔酷睿 i7 15.6英寸游戏笔记本电脑(i7-8750H 8G 512G SSD GTX1060 144Hz黑)",
          "price": 8599,
          "stock": 1900
        }
      },
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "QIEGtmgBBdkQnU_d-r6T",
        "_score": 1,
        "_source": {
          "title": "TP-LINK TL-WDR5620 1200M 5G双频智能无线路由器 四天线智能wifi 稳定穿墙高速家用路由器",
          "price": 109,
          "stock": 9970
        }
      }
    ]
  }
}

二、结果过滤

默认情况下，elasticsearch在搜索的结果中，会把文档中保存在 _source 的所有字段都返回。

如果我们只想获取其中的部分字段，我们可以添加 _source 字段进行过滤

2.1 包含字段查询（includes）

查询指令：

GET /shop/_search
{
  "query": {
    "match_all": {}
  },
  "_source": {
    "includes": ["title","price"]
  }
}

查询结果：

{
  "took": 4,
  "timed_out": false,
  "_shards": {
    "total": 3,
    "successful": 3,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 4,
    "max_score": 1,
    "hits": [
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "P4EGtmgBBdkQnU_d8b7I",
        "_score": 1,
        "_source": {
          "price": 8599,
          "title": "联想(Lenovo)拯救者Y7000P英特尔酷睿 i7 15.6英寸游戏笔记本电脑(i7-8750H 8G 512G SSD GTX1060 144Hz黑)"
        }
      },
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "QIEGtmgBBdkQnU_d-r6T",
        "_score": 1,
        "_source": {
          "price": 109,
          "title": "TP-LINK TL-WDR5620 1200M 5G双频智能无线路由器 四天线智能wifi 稳定穿墙高速家用路由器"
        }
      },
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "PYEGtmgBBdkQnU_d4b4m",
        "_score": 1,
        "_source": {
          "price": 2299,
          "title": "小米8 全面屏游戏智能手机 6GB+64GB 黑色 全网通4G 双卡双待"
        }
      },
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "PoEGtmgBBdkQnU_d6b4Q",
        "_score": 1,
        "_source": {
          "price": 4999,
          "title": "OPPO Find X曲面全景屏 波尔多红 8GB+128GB 全网通 移动联通电信全网通4G 双卡双待手机"
        }
      }
    ]
  }
}

2.2 排除字段查询（excludes）

查询指令

GET /shop/_search
{
  "query": {
    "match_all": {}
  },
  "_source": {
    "excludes": "price"
  }
}

查询结果：

{
  "took": 3,
  "timed_out": false,
  "_shards": {
    "total": 3,
    "successful": 3,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 4,
    "max_score": 1,
    "hits": [
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "P4EGtmgBBdkQnU_d8b7I",
        "_score": 1,
        "_source": {
          "title": "联想(Lenovo)拯救者Y7000P英特尔酷睿 i7 15.6英寸游戏笔记本电脑(i7-8750H 8G 512G SSD GTX1060 144Hz黑)",
          "stock": 1900
        }
      },
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "QIEGtmgBBdkQnU_d-r6T",
        "_score": 1,
        "_source": {
          "title": "TP-LINK TL-WDR5620 1200M 5G双频智能无线路由器 四天线智能wifi 稳定穿墙高速家用路由器",
          "stock": 9970
        }
      },
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "PYEGtmgBBdkQnU_d4b4m",
        "_score": 1,
        "_source": {
          "title": "小米8 全面屏游戏智能手机 6GB+64GB 黑色 全网通4G 双卡双待",
          "stock": 8800
        }
      },
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "PoEGtmgBBdkQnU_d6b4Q",
        "_score": 1,
        "_source": {
          "title": "OPPO Find X曲面全景屏 波尔多红 8GB+128GB 全网通 移动联通电信全网通4G 双卡双待手机",
          "stock": 5600
        }
      }
    ]
  }
}

三、高级查询

3.1 范围查询（range）

查询找出那些落在指定区间内的数字或者时间

查询指令：

GET /shop/_search
{
  "query": {
    "range": {
      "price": {
        "gte": 2000,
        "lte": 5000
      }
    }
  }
}

查询结果：

{
  "took": 3,
  "timed_out": false,
  "_shards": {
    "total": 3,
    "successful": 3,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 2,
    "max_score": 1,
    "hits": [
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "PYEGtmgBBdkQnU_d4b4m",
        "_score": 1,
        "_source": {
          "title": "小米8 全面屏游戏智能手机 6GB+64GB 黑色 全网通4G 双卡双待",
          "price": 2299,
          "stock": 8800
        }
      },
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "PoEGtmgBBdkQnU_d6b4Q",
        "_score": 1,
        "_source": {
          "title": "OPPO Find X曲面全景屏 波尔多红 8GB+128GB 全网通 移动联通电信全网通4G 双卡双待手机",
          "price": 4999,
          "stock": 5600
        }
      }
    ]
  }
}

range查询允许以下操作符

3.2 布尔查询（bool）

bool把各种其它查询通过must（与）、must_not（非）、should（或）的方式进行组合

查询指令：

GET /shop/_search
{
  "query": {
    "bool": {
      "should": [
        {
          "match": {
            "title": "笔记本"
          }
        },
        {
          "term": {
            "price": 109.00
          }
        }
      ]
    }
  }
}

查询结果：

{
  "took": 15,
  "timed_out": false,
  "_shards": {
    "total": 3,
    "successful": 3,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 2,
    "max_score": 1.9646256,
    "hits": [
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "P4EGtmgBBdkQnU_d8b7I",
        "_score": 1.9646256,
        "_source": {
          "title": "联想(Lenovo)拯救者Y7000P英特尔酷睿 i7 15.6英寸游戏笔记本电脑(i7-8750H 8G 512G SSD GTX1060 144Hz黑)",
          "price": 8599,
          "stock": 1900
        }
      },
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "QIEGtmgBBdkQnU_d-r6T",
        "_score": 1,
        "_source": {
          "title": "TP-LINK TL-WDR5620 1200M 5G双频智能无线路由器 四天线智能wifi 稳定穿墙高速家用路由器",
          "price": 109,
          "stock": 9970
        }
      }
    ]
  }
}

四、过滤查询

所有的查询都会影响到文档的评分及排名。如果我们需要在查询结果中进行过滤，并且不希望过滤条件影响评分，

那么就不要把过滤条件作为查询条件来用，而是使用filter方式。

查询指令：

GET /shop/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "title": "手机"
          }
        }
      ],
      "filter": {
        "range": {
          "price": {
            "gt": 3000
          }
        }
      }
    }
  }
}

查询结果：

{
  "took": 5,
  "timed_out": false,
  "_shards": {
    "total": 3,
    "successful": 3,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 1,
    "max_score": 0.17329858,
    "hits": [
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "PoEGtmgBBdkQnU_d6b4Q",
        "_score": 0.17329858,
        "_source": {
          "title": "OPPO Find X曲面全景屏 波尔多红 8GB+128GB 全网通 移动联通电信全网通4G 双卡双待手机",
          "price": 4999,
          "stock": 5600
        }
      }
    ]
  }
}

注意：filter中还可以再次进行bool组合条件过滤。

五、排序查询

sort 可以让我们按照不同的字段进行排序，并且通过order指定排序的方式。

查询指令：

GET /shop/_search
{
  "query": {
    "match_all": {}
  },
  "sort": [
    {
      "price": {
        "order": "desc"
      }
    }
  ]
}

查询结果：

{
  "took": 55,
  "timed_out": false,
  "_shards": {
    "total": 3,
    "successful": 3,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 4,
    "max_score": null,
    "hits": [
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "P4EGtmgBBdkQnU_d8b7I",
        "_score": null,
        "_source": {
          "title": "联想(Lenovo)拯救者Y7000P英特尔酷睿 i7 15.6英寸游戏笔记本电脑(i7-8750H 8G 512G SSD GTX1060 144Hz黑)",
          "price": 8599,
          "stock": 1900
        },
        "sort": [
          8599
        ]
      },
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "PoEGtmgBBdkQnU_d6b4Q",
        "_score": null,
        "_source": {
          "title": "OPPO Find X曲面全景屏 波尔多红 8GB+128GB 全网通 移动联通电信全网通4G 双卡双待手机",
          "price": 4999,
          "stock": 5600
        },
        "sort": [
          4999
        ]
      },
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "PYEGtmgBBdkQnU_d4b4m",
        "_score": null,
        "_source": {
          "title": "小米8 全面屏游戏智能手机 6GB+64GB 黑色 全网通4G 双卡双待",
          "price": 2299,
          "stock": 8800
        },
        "sort": [
          2299
        ]
      },
      {
        "_index": "shop",
        "_type": "goods",
        "_id": "QIEGtmgBBdkQnU_d-r6T",
        "_score": null,
        "_source": {
          "title": "TP-LINK TL-WDR5620 1200M 5G双频智能无线路由器 四天线智能wifi 稳定穿墙高速家用路由器",
          "price": 109,
          "stock": 9970
        },
        "sort": [
          109
        ]
      }
    ]
  }
}

posted @ 2019-02-03 22:23 heqiuyong 阅读(37508) 评论(0) 编辑收藏举报

heqiuyong

Anything is possible

Elasticsearch 数据查询

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