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关于后端:ElasticSearch系列基础用法

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基本操作

索引 <index>

创立 

# 1. 创立索引
- PUT / 索引名 ====> PUT /products
- 留神: 
        1.ES 中索引衰弱转态  red(索引不可用)、yellwo(索引可用, 存在危险)、green(衰弱)
        2. 默认 ES 在创立索引时回为索引创立 1 个备份索引和一个 primary 索引
        
# 2. 创立索引 进行索引分片配置
- PUT /products
{
  "settings": {
    "number_of_shards": 1, #指定主分片的数量
    "number_of_replicas": 0 #指定正本分片的数量
  }
}

)

查问 

# 查问索引
- GET /_cat/indices?v

删除 

# 3. 删除索引
- DELETE / 索引名 =====> DELETE /products
- DELETE /*     `* 代表通配符, 代表所有索引 `

映射 <mapping>

创立

字符串类型: keyword 关键字 关键词、text 一段文本

数字类型：integer long

小数类型：float double

布尔类型：boolean

日期类型：date

# 1. 创立索引 & 映射 
PUT /products
{ 
  "settings": {
    "number_of_shards": 1,
    "number_of_replicas": 0
  }, 
  "mappings": {
    "properties": {
      "title":{"type": "keyword"},
      "price":{"type": "double"},
      "created_at":{"type": "date"},
      "description":{"type": "text"}
    }
  }
}

阐明: ES 中反对字段类型十分丰盛，如：text、keyword、integer、long、ip 等。更多参见 https://www.elastic.co/guide/en/elasticsearch/reference/7.15/…

查问 

# 1. 查看某个索引的映射
- GET / 索引名 /_mapping =====> GET /products/_mapping

文档 <document>

增加文档 

POST /products/_doc/1 #指定文档 id 
{
  "title":"iphone13",
  "price":8999.99,
  "created_at":"2021-09-15",
  "description":"iPhone 13 屏幕采纳 6.1 英寸 OLED 屏幕。"
}
POST /products/_doc/ #主动生成文档 id
{
  "title":"iphone14",
  "price":8999.99,
  "created_at":"2021-09-15",
  "description":"iPhone 13 屏幕采纳 6.8 英寸 OLED 屏幕"
}
{
  "_index" : "products",
  "_type" : "_doc",
  "_id" : "sjfYnXwBVVbJgt24PlVU",
  "_version" : 1,
  "result" : "created",
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "failed" : 0
  },
  "_seq_no" : 3,
  "_primary_term" : 1
}

查问文档 

GET /products/_doc/1
{
  "_index" : "products",
  "_type" : "_doc",
  "_id" : "1",
  "_version" : 1,
  "_seq_no" : 0,
  "_primary_term" : 1,
  "found" : true,
  "_source" : {
    "title" : "iphone13",
    "price" : 8999.99,
    "created_at" : "2021-09-15",
    "description" : "iPhone 13 屏幕采纳 6.1 英寸 OLED 屏幕"
  }
}

删除文档 

DELETE /products/_doc/1
{
  "_index" : "products",
  "_type" : "_doc",
  "_id" : "1",
  "_version" : 2,
  "result" : "deleted",
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "failed" : 0
  },
  "_seq_no" : 2,
  "_primary_term" : 1
}

更新文档 

PUT /products/_doc/sjfYnXwBVVbJgt24PlVU
{"title":"iphon15"}

阐明: 这种更新形式是先删除原始文档, 在将更新文档以新的内容插入。

POST /products/_doc/sjfYnXwBVVbJgt24PlVU/_update
{
    "doc" : {"title" : "iphon15"}
}

阐明: 这种形式能够将数据原始内容保留, 并在此基础上更新。

批量操作 

POST /products/_doc/_bulk #批量索引两条文档
     {"index":{"_id":"1"}}
          {"title":"iphone14","price":8999.99,"created_at":"2021-09-15","description":"iPhone 13 屏幕采纳 6.8 英寸 OLED 屏幕"}
    {"index":{"_id":"2"}}
          {"title":"iphone15","price":8999.99,"created_at":"2021-09-15","description":"iPhone 15 屏幕采纳 10.8 英寸 OLED 屏幕"}
POST /products/_doc/_bulk #更新文档同时删除文档
    {"update":{"_id":"1"}}
        {"doc":{"title":"iphone17"}}
    {"delete":{"_id":2}}
    {"index":{}}
        {"title":"iphone19","price":8999.99,"created_at":"2021-09-15","description":"iPhone 19 屏幕采纳 61.8 英寸 OLED 屏幕"}

阐明: 批量时不会因为一个失败而全副失败, 而是继续执行后续操作, 在返回时依照执行的状态返回!

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