ES（2）基本使用

文章目录

创建索引
查询索引
- 查询 shopping索引
- 查询所有索引
删除索引
数据操作
- 添加
- 查询
- - 查询指定id数据
- 查询所有数据
- 修改
- - 完全覆盖
  - 局部修改
- 删除
复杂查询操作
- 条件查询
- - 根据字段名和值查询对应数据
  - 全量查询
  - 分页查询
  - 显示指定字段
  - 排序查询
- 多条件查询
- - must（and）
  - filter （where）
- 完全匹配
- 高亮查询
- 聚合查询
- - 分组
  - 求平均

创建索引

创建索引等同于创建数据库

创建一个shopping的索引需要在Postman中，向ES服务器发送 PUT 请求:

http://127.0.0.1:9200/shopping

{"acknowledged": true,"shards_acknowledged": true,"index": "shopping"
}

PUT 具有幂等性再次请求相同名称的索引会出现问题，提示你重复了。

查询索引

查询 shopping索引

获取 shopping 索引相关信息。
用 GET 请求发送

http://127.0.0.1:9200/shopping

{"shopping": {"aliases": {},"mappings": {},"settings": {"index": {"routing": {"allocation": {"include": {"_tier_preference": "data_content"}}},"number_of_shards": "1","provided_name": "shopping","creation_date": "1670935714623","number_of_replicas": "1","uuid": "vC5bzEg2SK-yTYK20D2jMA","version": {"created": "7160299"}}}}
}

查询所有索引

GET http://127.0.0.1:9200/_cat/indices?v

health status index            uuid                   pri rep docs.count docs.deleted store.size pri.store.size
green  open   .geoip_databases 2iBY2CVPTaSv3xUEjYU_2g   1   0         40            0       38mb           38mb
yellow open   shopping         vC5bzEg2SK-yTYK20D2jMA   1   1          0            0       226b           226b

删除索引

DELETE http://127.0.0.1:9200/shopping

{"acknowledged": true
}

数据操作

添加

POST http://127.0.0.1:9200/shopping/_doc/1001 并且传递json参数

{"title":"小米手机","category":"小米","images":"1.png","price":1999
}

_doc 文档数据

/1001 指定id

id可以不填发送 http://127.0.0.1:9200/shopping/_doc 会随机创建id

返回json

{"_index": "shopping","_type": "_doc","_id": "1001","_version": 1,"result": "created","_shards": {"total": 2,"successful": 1,"failed": 0},"_seq_no": 1,"_primary_term": 1
}

查询

查询指定id数据

GET http://127.0.0.1:9200/shopping/_doc/1001 无需携带body

{"_index": "shopping","_type": "_doc","_id": "1001","_version": 1,"_seq_no": 1,"_primary_term": 1,"found": true,"_source": {"title": "小米手机","category": "小米","images": "1.png","price": 1999}
}

查询所有数据

GET http://127.0.0.1:9200/shopping/_search 无需携带body

{"took": 173,"timed_out": false,"_shards": {"total": 1,"successful": 1,"skipped": 0,"failed": 0},"hits": {"total": {"value": 2,"relation": "eq"},"max_score": 1.0,"hits": [{"_index": "shopping","_type": "_doc","_id": "nveSC4UBUGCCAe-4B2he","_score": 1.0,"_source": {"title": "小米手机","category": "小米","images": "1.png","price": 1999}},{"_index": "shopping","_type": "_doc","_id": "1001","_score": 1.0,"_source": {"title": "小米手机","category": "小米","images": "1.png","price": 1999}}]}
}

修改

完全覆盖

PUT http://127.0.0.1:9200/shopping/_doc/1001

{"title":"小米手机","category":"小米","images":"1.png","price":4999
}

返回json

{"_index": "shopping","_type": "_doc","_id": "1001","_version": 2,"result": "updated","_shards": {"total": 2,"successful": 1,"failed": 0},"_seq_no": 2,"_primary_term": 1
}

局部修改

POST http://127.0.0.1:9200/shopping/_update/1001

{"doc":{"title":"华为手机"}
}

返回json

{"_index": "shopping","_type": "_doc","_id": "1001","_version": 3,"result": "updated","_shards": {"total": 2,"successful": 1,"failed": 0},"_seq_no": 3,"_primary_term": 1
}

删除

DELETE http://127.0.0.1:9200/shopping/_doc/1001

{"_index": "shopping","_type": "_doc","_id": "1001","_version": 4,"result": "deleted","_shards": {"total": 2,"successful": 1,"failed": 0},"_seq_no": 4,"_primary_term": 1
}

复杂查询操作