这篇文章主要介绍“Elasticsearch文档索引的增删改查方法”的相关知识,小编通过实际案例向大家展示操作过程,操作方法简单快捷,实用性强,希望这篇“Elasticsearch文档索引的增删改查方法”文章能帮助大家解决问题。
接口幂等性
0 接口幂等性:数学概念,多次请求,相当于一次请求
get,put,delete都是幂等性的接口
post 存在幂等性的问题
前端速度很快,点了两次,会生成两个订单
用户在访问新增页面时(提交订单)---》接口返回一个唯一id,提交订单,携带唯一id过来,后端判断这个唯一id是否被用过---》没用过,创建订单
你在项目中碰到的问题和如何解决(项目收获)下订单,经常重复订单,点得快,幂等性问题,如何解决的
倒排索引
es介绍10个点
安装
-jdk :java开发环境
官网下载es相应的版本,解压,到bin目录下启动elasticsearch.bat
两个客户端(kibana:官方,发送请求,数据统计,展示,elasticsearch-head:第三方用node写的)
kibana跟es版本对应,bin路径下,直接启动
elasticsearch-head需要安装node环境,npm install ---》npm run start
kibana配置文件配置(copy一下,kibana监听的地址端口,随便名一个名,连接es的地址)
修改es配置:允许跨域(浏览器的同源策略),cors:跨域资源共享,实现跨域
es的倒排索引(扩展阅读.md)
把文章进行分词,对每个词建立索引
3 索引操作
# 索引操作---》数据库操作---》新增,删除,修改,查询# 1 新增索引:PUT lqz2 # lqz2就是索引名字{ "settings": { "index":{ "number_of_shards":5, "number_of_replicas":1 } }}# 2 查询索引GET lqz2/_settings返回结果{ "lqz2" : { "settings" : { "index" : { "creation_date" : "1588822389842", "number_of_shards" : "1", "number_of_replicas" : "1", "uuid" : "NBXIeVdHQ26vCuPn8_6uew", "version" : { "created" : "7050099" }, "provided_name" : "lqz2" } } }}# 3 更新索引PUT lqz2/_settings{ "number_of_replicas": 2}#4 删除lqz2索引DELETE lqz2
4 文档基本增删查改
#1 新增文档POST lqz2/_doc/1{ "title":"红楼梦", "price":12, "publish_addr":{ "province":"黑龙江", "city":"鹤岗" }, "publish_date":"2013-11-11", "read_num":199, "tag":["古典","名著"]}POST lqz2/_doc/2{ "title":"西游记", "price":22, "publish_addr":{ "province":"上海", "city":"上海" }, "publish_date":"2013-11-11", "read_num":66, "tag":["古典","小说"]}# 2 查询文档(更详细的查找,后面讲)GET lqz2/_doc/2# 3 修改文档-覆盖式(原来的字段就没有了)PUT lqz/_doc/1{ "title":"xxxx", "price":333, "publish_addr":{ "province":"黑龙江", "city":"福州" }}-增量式(只修改某个字段)一定要注意包在doc中POST lqz2/_doc/1/_update{ "doc":{ "title":"xx" }}# 4 删除文档DELETE lqz/_doc/1# 5 批量获取GET _mget{ "docs":[ { "_index":"lqz2", "_type":"_doc", "_id":2 }, { "_index":"lqz2", "_type":"_doc", "_id":1 } ]}# 6 批量插入PUT test/_doc/2/_create{ "field1" : "value22"}POST _bulk{ "index" : { "_index" : "test", "_id" : "1" } }{ "field1" : "value1" }{ "delete" : { "_index" : "test", "_id" : "2" } }{ "create" : { "_index" : "test", "_id" : "3" } }{ "field1" : "value3" }{ "update" : {"_id" : "1", "_index" : "test"} }{ "doc" : {"field2" : "value2"} }
5 文档查询
# 测试数据PUT lqz/doc/1{ "name":"顾老二", "age":30, "from": "gu", "desc": "皮肤黑、武器长、性格直", "tags": ["黑", "长", "直"]}PUT lqz/doc/2{ "name":"大娘子", "age":18, "from":"sheng", "desc":"肤白貌美,娇憨可爱", "tags":["白", "富","美"]}PUT lqz/doc/3{ "name":"龙套偏房", "age":22, "from":"gu", "desc":"mmp,没怎么看,不知道怎么形容", "tags":["造数据", "真","难"]}# 两种方式-第一种(字符串查询) GET lqz/doc/_search?q=from:gu GET lqz/doc/_search?q=age:22 -查询的第二种方式(结构化) GET lqz/doc/_search { "query": { "match": { "from": "gu" } } } GET lqz/doc/_search { "query": { "match": { "age": 22 } } } GET lqz/doc/_search { "query": { "match": { "desc": "形容" } } }GET lqz/doc/_search{ "query": { "match": { "tags": "造数据" } }}
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