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【ES
1、document数据格式
面向文档的搜索分析引擎
（1）应用系统的数据结构都是面相对象的，复杂的。
public class Employee{private String email;private String firstName;private EmployeeInfo info;
}
public class EmployeeInfo{private String bio;private Integer age;private String[] interes;
}EmployeeInfo info = new EmployeeInfo();
info.setBio("curios and modest")info.setage(30);
info.setInterests(new String[]{"bike","climb"});Employee employee = new Employee();
employee.setEmail("zhangsna@164")employee.setFirstName("san")empolyee.setInfo(info)
employee对象；包含了Employee类自己的属性还有一个info对象，
当我们存到关系型数据库的时候，还需要拆开到两个表中，但是ES不用，所以是面相对象。
（2）对象数据存储到数据库中，只能拆解开来，变为扁平的多个表，每次查询的时候还得还原回原来对象格式，相当麻烦
(3) ES 是面相文档的，文档中存储的数据结构，与面向对象的数据结构是一样的。
（4）ES的document用JSON数据格式表达
2、电商网站商品管理案例背景介绍
（1）对商品CRUD
（2） 执行简单结构化查询
（3）可以执行简单的全文检索，以及复杂的短语检索
3、简单集群操作
（1）快速检查集群的健康状况
GET _cat/health?vepoch timestamp cluster status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1663923665 09:01:05 elasticsearch green 1 1 3 3 0 0 0 0 - 100.0%
如何快速了解集群的健康状况？green、yellow、red?
status
green:每个索引的primary shard和 replica shard都是active状态的
yellow: 每个索引的Primary shard都是active状态的，但是部分replica shard不是active状态，处于不可用状态
red: 不是所有索引的Primary shard都是active状态的，部分索引有数据丢失
（2）快速查看集群中有哪些索引
Get /_cat/indices?v
(3) 简单的索引操作
创建索引: PUT /test_index?pretty
{"acknowledged" : true,"shards_acknowledged" : true,"index" : "test_index"
}
删除索引: DELETE /test_index?pretty
{"acknowledged" : true
}
4、商品的CRUD的操作
(1) 新增商品: 新增文档，建立索引
put /index/type/idPUT /ecommerce/product/1
{"name":"gaolujie yagao","desc":"gaoxiao meibai","price": 30,"producer": "gaolujie producer"
}返回的值为：
{"_index" : "ecommerce","_type" : "product","_id" : "1","_version" : 1,"result" : "created","_shards" : {"total" : 2,"successful" : 1,"failed" : 0},"_seq_no" : 0,"_primary_term" : 1
}
PUT /ecommerce/product/1
{"name":"gaolujie yagao","desc":"gaoxiao meibai","price": 30,"producer": "gaolujie producer"
}
PUT /ecommerce/product/2
{"name":"jiajieshi yagao","desc":"youxiaofangzhu","price": 25,"producer": "jiajieshi producer"
}
PUT /ecommerce/product/3
{"name":"zhonghua yagao","desc":"caobenzhiwu","price": 40,"producer": "zhonghua producer"
}
es 会自动创建index和type ,不需要提前创建，而且es默认会对ducument每个field都建立倒排索引
(2) 查询商品:检索文档
GET /index/type/id
GET /ecommerce/product/1
{"_index" : "ecommerce","_type" : "product","_id" : "1","_version" : 1,"_seq_no" : 0,"_primary_term" : 1,"found" : true,"_source" : {"name" : "gaolujie yagao","desc" : "gaoxiao meibai","price" : 30,"producer" : "gaolujie producer"}
}
（3） 修改商品：替换文档
PUT /ecommerce/product/1
{"name":"jiajiehsi yagao","desc":"gaoxiao meibai","price": 30,"producer": "gaolujie producer"
}{"_index" : "ecommerce","_type" : "product","_id" : "1","_version" : 2,"result" : "updated","_shards" : {"total" : 2,"successful" : 1,"failed" : 0},"_seq_no" : 3,"_primary_term" : 1
}
这里变成了updated
替换方式有一个不好，必须带上所有的filed，才能去进行信息的修改。
（4）修改商品：更新文档
POST /ecommerce/product/1/_update (API)
{"doc":{"name":"jiaqiangban gaolujieyagao"}
}{"_index" : "ecommerce","_type" : "product","_id" : "1","_version" : 3,"result" : "updated","_shards" : {"total" : 2,"successful" : 1,"failed" : 0},"_seq_no" : 4,"_primary_term" : 1
}
(5) 删除商品
DELETE /ecommerce/product/1{"_index" : "ecommerce","_type" : "product","_id" : "1","_version" : 4,"result" : "deleted","_shards" : {"total" : 2,"successful" : 1,"failed" : 0},"_seq_no" : 5,"_primary_term" : 1
}GET /ecommerce/product/1{"_index" : "ecommerce","_type" : "product","_id" : "1","found" : false
}
本文标签： ES
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