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Elasticsearch 7.x文档基本操作(CRUD)

2019-11-13 14:03:34  阅读:57  来源: 互联网

标签:index doc CRUD blog version 文档 基本操作 Elasticsearch VMware



官方文档:
https://www.elastic.co/guide/en/elasticsearch/reference/current/docs.html

1.1 添加文档

(1)指定文档ID

PUT blog/_doc/1
{
  "title":"1、VMware Workstation虚拟机软件安装图解",
  "author":"chengyuqiang",
  "content":"1、VMware Workstation虚拟机软件安装图解...",
  "url":"http://x.co/6nc81"
}

Elasticsearch服务会返回一个JSON格式的响应。

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

响应结果说明:

  • _index:文档所在的索引名
  • _type:文档所在的类型名
  • _id:文档ID
  • _version:文档的版本
  • result:created已经创建
  • _shards: _shards表示索引操作的复制过程的信息。
  • total:指示应在其上执行索引操作的分片副本(主分片和副本分片)的数量。
  • successful:表示索引操作成功的分片副本数。
  • failed:在副本分片上索引操作失败的情况下包含复制相关错误。

(2)不指定文档ID
添加文档时可以不指定文档id,则文档id是自动生成的字符串。注意,需要使用POST方法,而不是PUT方法。

POST blog/_doc
{
  "title":"2、Linux服务器安装图解",
  "author":"chengyuqiang",
  "content":"2、Linux服务器安装图解解...",
  "url":"http://x.co/6nc82"
}
{
  "_index" : "blog",
  "_type" : "_doc",
  "_id" : "5P2-O2gBNSQY7o-KMw2P",
  "_version" : 1,
  "result" : "created",
  "_shards" : {
    "total" : 2,
    "successful" : 1,
    "failed" : 0
  },
  "_seq_no" : 1,
  "_primary_term" : 1
}

1.2 获取文档

(1)通过文档id获取指定的文档

GET blog/_doc/1
{
  "_index" : "blog",
  "_type" : "_doc",
  "_id" : "1",
  "_version" : 1,
  "found" : true,
  "_source" : {
    "title" : "1、VMware Workstation虚拟机软件安装图解",
    "author" : "chengyuqiang",
    "content" : "1、VMware Workstation虚拟机软件安装图解...",
    "url" : "http://x.co/6nc81"
  }
}

响应结果说明:

  • found值为true,表明查询到该文档
  • _source字段是文档的内容

(2)文档不存在的情况

GET blog/_doc/2
{
  "_index" : "blog",
  "_type" : "_doc",
  "_id" : "2",
  "found" : false
}

found字段值为false表明查询的文档不存在。
(3)判定文档是否存在

HEAD blog/_doc/1
200 - OK

1.3 更新文档

更改id为1的文档,删除了author,修改content字段。

PUT blog/_doc/1
{
  "title":"1、VMware Workstation虚拟机软件安装图解",
  "content":"下载得到VMware-workstation-full-15.0.2-10952284.exe可执行文件...",
  "url":"http://x.co/6nc81"
}
{
  "_index" : "blog",
  "_type" : "_doc",
  "_id" : "1",
  "_version" : 2,
  "result" : "updated",
  "_shards" : {
    "total" : 2,
    "successful" : 1,
    "failed" : 0
  },
  "_seq_no" : 1,
  "_primary_term" : 1
}

_version更新为2

查看该文档

GET blog/_doc/1
{
  "_index" : "blog",
  "_type" : "_doc",
  "_id" : "1",
  "_version" : 2,
  "found" : true,
  "_source" : {
    "title" : "1、VMware Workstation虚拟机软件安装图解",
    "content" : "下载得到VMware-workstation-full-15.0.2-10952284.exe可执行文件...",
    "url" : "http://x.co/6nc81"
  }
}

(2)添加文档时,防止覆盖已存在的文档,可以通过_create加以限制。

PUT blog/_doc/1/_create
{
  "title":"1、VMware Workstation虚拟机软件安装图解",
  "content":"下载得到VMware-workstation-full-15.0.2-10952284.exe可执行文件...",
  "url":"http://x.co/6nc81"
}

该文档已经存在,添加失败。

{
  "error": {
    "root_cause": [
      {
        "type": "version_conflict_engine_exception",
        "reason": "[_doc][1]: version conflict, document already exists (current version [2])",
        "index_uuid": "GqC2fSqPS06GRfTLmh1TLg",
        "shard": "1",
        "index": "blog"
      }
    ],
    "type": "version_conflict_engine_exception",
    "reason": "[_doc][1]: version conflict, document already exists (current version [2])",
    "index_uuid": "GqC2fSqPS06GRfTLmh1TLg",
    "shard": "1",
    "index": "blog"
  },
  "status": 409
}

(3)更新文档的字段
通过脚本更新制定字段,其中ctx是脚本语言中的一个执行对象,先获取_source,再修改content字段

POST blog/_doc/1/_update
{
  "script": {
    "source": "ctx._source.content=\"从官网下载VMware-workstation,双击可执行文件进行安装...\""  
  } 
}

 

 

 



标签:index,doc,CRUD,blog,version,文档,基本操作,Elasticsearch,VMware
来源: https://www.cnblogs.com/liugp/p/11848408.html

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