ElasticSearch入门到精通-1.ElasticSear

2019-10-29 本文已影响0人笨鸡

1.ElasticSearch安装

elasticsearch下载安装

https://www.elastic.co/cn/downloads/

elasticsearch-head插件

https://github.com/mobz/elasticsearch-head
git clone git://github.com/mobz/elasticsearch-head.git
cd elasticsearch-head
npm install
npm run start
open http://localhost:9100/

elasticsearch改配置，使elasticsearch-head插件能跨域访问

config elasticsearch.yml

bootstrap.memory_lock: false
cluster.name: my-elasticsearch-application
http.port: 9200
network.host: 127.0.0.1
node.data: true
node.ingest: true
node.master: true
node.max_local_storage_nodes: 1
node.name: ElasticSearch Master
path.data: D:\Program Files\Elastic\Elasticsearch\data
path.logs: D:\Program Files\Elastic\Elasticsearch\logs
transport.tcp.port: 9300
xpack.license.self_generated.type: basic
xpack.security.enabled: true
http.cors.enabled: true
http.cors.allow-origin: "*"

2.ElasticSearch添加索引

head插件

elasticsearch-head1.png
elasticsearch-head2.png
elasticsearch-head3.png

{
  "novel": {
    "properties": {
      "title": {
        "type": "text"
      }
    }
  }
}

postman

postman.png

{
      "settings": {
          "number_of_shards": 3,
          "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"
                  }
              }
          },
          "woman": {
          
          }
      }
  }

elasticsearch-6.7.2版本mappings下不支持[woman, man]两个索引，把woman那个删除。

3.ElasticSearch的增删改查

增
- 指定id为1的增
  
  127.0.0.1:9200/people/man/1 put
  
  postman1.png
- 不指定id
  
  127.0.0.1:9200/people/man post
  
  postman2.png
删

127.0.0.1:9200/people/man/YzAIE24B3Dw_V0_L1AaA delete

postman3.png
改
- 直接在之前数据上更改
  postman4.png
- 用_update 127.0.0.1:9200/people/man/1/_update post
  postman5.png
- 使用script
  postman6.png

查

插入数据源

import requests
import random
import json


def main():
    language = ['C', 'Java', 'Python', 'ElasticSearch']
    author = ['张三', '李四', '王五', '赵六']
    level = ['入门', '熟悉', '精通']
    id = 0
    url = 'http://127.0.0.1:9200/book/novel/'
    headers = {'Content-Type': 'application/json;charset=UTF-8'}
    for i in language:
        for j in level:
            id += 1
            data = {
                'author': author[language.index(i)],
                'title': i + j,
                'word_count': random.randint(50, 150) * 100,
                'publish_date': '2019-' + ('0' if id < 10 else '') + str(id) + '-01'
            }
            print(data)
            r = requests.post(url + str(id), json.dumps(data), headers=headers)
            print(r.content)


if __name__ == '__main__':
    main()

elasticsearch数据浏览.png

GET 127.0.0.1:9200/book/novel/1

postman7.png

POST 127.0.0.1:9200/book/_search 查询所有

postman8.png

查询全部数据
{
    "query": {
        "match_all": {}
    }
}

查询一条数据
{
    "query": {
        "match_all": {}
    },
    "from": 1,
    "size": 1
}

关键词查询
{
    "query": {
        "match": {
            "title": "ElasticSearch"
        }
    }
}

关键词查询按日期降序
{
    "query": {
        "match": {
            "title": "ElasticSearch"
        }
    },
    "sort": [
        {
            "publish_date": {
                "order": "desc"
            }
        }
    ]
}

聚合查询
{
    "aggs": {
        "group_by_word_count": {
            "terms": {
                "field": "word_count"
            }
        },
        "group_by_publish_date": {
            "terms": {
                "field": "publish_date"
            }
        }
    }
}

统计
{
    "aggs": {
        "grades_word_count": {
            "stats": {
                "field": "word_count"
            }
        }
    }
}

最小值
{
    "aggs": {
        "grades_word_count": {
            "min": {
                "field": "word_count"
            }
        }
    }
}

4.ElasticSearch高级查询

子条件查询特定字段查询所指特定值

Query context

ElasticSearch Query context1.png
ElasticSearch Query context2.png

模糊匹配
{
    "query": {
        "match": {
            "title": "ElasticSearch入门"
        }
    }
}

精准匹配
{
    "query": {
        "match_phrase": {
            "title": "ElasticSearch入门"
        }
    }
}

多字段匹配
{
    "query": {
        "multi_match": {
            "query": "ElasticSearch",
            "fields": ["author", "title"]
        }
    }
}

语法查询
{
    "query": {
        "query_string": {
            "query": "(ElasticSearch AND 入门) OR Python"
        }
    }
}

{
    "query": {
        "query_string": {
            "query": "ElasticSearch OR 张三",
            "fields": ["title", "author"]
        }
    }
}

字段查询
{
    "query": {
        "term": {
            "word_count": 5700
        }
    }
}

{
    "query": {
        "term": {
            "author": "张三"
        }
    }
}

字数范围 5000 <= word_count <= 8000
{
    "query": {
        "range": {
            "word_count": {
                "gte": 5000,
                "lte": 8000
            }
        }
    }
}

字数范围 5000 < word_count <= 8000
{
    "query": {
        "range": {
            "word_count": {
                "gt": 5000,
                "lte": 8000
            }
        }
    }
}

时间范围 2019-01-01 <= publish_date <= 2019-08-01
{
    "query": {
        "range": {
            "publish_date": {
                "gte": "2019-01-01",
                "lte": "2019-08-01"
            }
        }
    }
}

时间范围 2019-01-01 <= publish_date <= now
{
    "query": {
        "range": {
            "publish_date": {
                "gte": "2019-01-01",
                "lte": "now"
            }
        }
    }
}

Filter context

ElasticSearch Filter context1.png

 {
    "query": {
        "bool": {
            "filter": {
                "term": {
                    "word_count": 5700
                }
            }
        }
    }
}

复合条件查询以一定的逻辑组合子条件查询

固定分数查询

{
    "query": {
        "constant_score": {
            "filter": {
                "match": {
                    "title": "ElasticSearch"
                }
            }
        }
    }
}

{
    "query": {
        "constant_score": {
            "filter": {
                "match": {
                    "title": "ElasticSearch"
                }
            },
            "boost": 2
        }
    }
}

布尔查询

{
    "query": {
        "bool": {
            "should": [
                {
                    "match": {
                        "title": "ElasticSearch"
                    }
                },
                {
                    "match": {
                        "author": "张三"
                    }
                }
            ]
        }
    }
}

{
    "query": {
        "bool": {
            "must": [
                {
                    "match": {
                        "title": "ElasticSearch"
                    }
                },
                {
                    "match": {
                        "author": "张三"
                    }
                }
            ]
        }
    }
}

{
    "query": {
        "bool": {
            "must": [
                {
                    "match": {
                        "title": "ElasticSearch"
                    }
                },
                {
                    "match": {
                        "author": "赵六"
                    }
                }
            ],
            "filter": [
                {
                    "term": {
                        "word_count": 6000
                    }
                }
            ]
        }
    }
}

{
    "query": {
        "bool": {
            "must_not": {
                "term": {
                    "author": "张三"
                }
            }
        }
    }
}

...more

ElasticSearch入门到精通-1.ElasticSear

1.ElasticSearch安装

2.ElasticSearch添加索引

3.ElasticSearch的增删改查

4.ElasticSearch高级查询

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