ElasticSearch-入门学习

基本概念

索引：含有相同属性的文档集合 --相当于database
类型：索引可以定义一个或多个类型，文档必须属于一个类型 --相当于table
文档：文档是可以被索引的基本数据单位，是最小的存储单位 --相当于row

RESTFul API

索引创建：

http://localhost:9200/people put
{
  "settings": {
    "index": {
      "number_of_shards": 5,
      "number_of_replicas": 1
    }
  }
}

在索引上创建类型映射

http://localhost:9200/people/man/_mappings put/post
{
  "properties": {
    "name": {
      "type": "text"
    },
    "country": {
      "type": "keyword"
    },
    "age": {
      "type": "integer"
    },
    "date": {
      "type": "date",
      "format": "yyyy-MM-dd HH:mm:ss"
    }
  }
}

一次性创建索引和类型映射

http://localhost:9200/people put
{
  "settings": {
    "index": {
      "number_of_shards": 5,
      "number_of_replicas": 1
    }
  },
  "mappings": {
    "man": {
      "properties": {
        "name": {
          "type": "text"
        },
        "country": {
          "type": "keyword"
        },
        "age": {
          "type": "integer"
        },
        "date": {
          "type": "date",
          "format": "yyyy-MM-dd HH:mm:ss||yyyy-MM-dd||epoch_millis"
        }
      }
    }
  }
}

插入文档（自定义文档id）

http://localhost:9200/people/man/1 put/post
{
  "name": "zhangnna",
  "country": "中国",
  "age": 25,
  "date": "2020-02-04"
}

插入文档（自动生成文档id）

http://localhost:9200/people/man post
{
  "name": "zhangnan",
  "country": "China",
  "age": 25,
  "date": "2020-02-04"
}

修改文档

http://localhost:9200/people/man/1/_update post
{
  "doc": {
    "name": "张四"
  }
}

修改文档（脚本修改，默认脚本：painless）

http://localhost:9200/people/man/1/_update post
{
  "script": {
    "lang": "painless",
    "inline": "ctx._source.age+=5"
  }
}

{
  "script": {
    "lang": "painless",
    "inline": "ctx._source.age+=params.age",
    "params": {
      "age": 25
    }
  }
}

删除索引

http://localhost:9200/people delete

删除文档

http://localhost:9200/people/man/1 delete

基本查询

http://localhost:9200/people/man/1 get

条件查询

http://localhost:9200/people/man/_search post
{
  "query": {
    "match_all": {}
  },
  "from": 0,
  "size": 2
}

条件查询-关键词查询

http://localhost:9200/people/man/_search post
{
  "query": {
    "match": {
      "name": "zhang"
    }
  },
  "sort": [
    {
      "_id": {
        "order": "desc"
      }
    }
  ]
}

聚合查询

http://localhost:9200/people/man/_search post
{
  "aggs": {
    "group_by_date": {
      "terms": {
        "field": "date"
      }
    },
    "group_by_age": {
      "terms": {
        "field": "age"
      }
    },
    "stats_age": {
      "stats": {
        "field": "age"
      }
    },
    "sun_age": {
      "sum": {
        "field": "age"
      }
    }
  }
}

高级查询-Query

全文本查询：针对文本类型数据

习语查询（match_phrase）

http://localhost:9200/people/man/_search post
{
  "query": {
    "match_phrase": {
      "name": "张三李白"
    }
  }
}

多个字段查询（multi_match）

http://localhost:9200/people/man/_search post
{
  "query": {
    "multi_match": {
      "query": "张三",
      "fields": [
        "name",
        "counrty"
      ]
    }
  }
}

语法查询（query_string）

http://localhost:9200/people/man/_search post
{
  "query": {
    "query_string": {
      "query": "(张三 and 李白) or snooker"
    }
  }
}

字段级别查询：针对结构化数据，如数字、日期等

范围查询（range gte是>=， gt是>）

http://localhost:9200/people/man/_search post
{
  "query": {
    "range": {
      "age": {
        "gte": 20,
        "lte": 49
      }
    }
  }
}

高级查询-Filter

在查询过程中，只判断该文档是否满足条件，只有Yes后者No。

http://localhost:9200/people/man/_search post
{
  "query": {
    "bool": {
      "filter": {
        "term": {
          "age": 12
        }
      }
    }
  }
}

来源：CSDN

作者：Snooker0218

链接：https://blog.csdn.net/m0_37643853/article/details/104169813