es的基本安装
安装遇到的问题
java本地环境和es环境冲突
https://www.cnblogs.com/q1359720840/p/14077049.html
,看要使用jdk11,本机安装了jdk8,修改默认jdk配置吧,好家伙es自带jdk15,就用它了,
配置SE_JAVA_HOME(类似java_home),
接下来返回到elasticsearch,在bin目录下找到elasticsearch-env文件,在39-40行处。将JAVA_HOME改成ES_JAVA_HOME
我将javahome都改成ES_JAVA_HOME起来了
if "%ES_JAVA_HOME%" == "" (
set JAVA="%ES_HOME%\jdk\bin\java.exe"
set ES_JAVA_HOME="%ES_HOME%\jdk"
set JAVA_TYPE=bundled jdk
) else (
set JAVA="%ES_JAVA_HOME%\bin\java.exe"
set JAVA_TYPE=ES_JAVA_HOME
)
另一种方式:直接使用本地java环境的11
在bin目录下找到elasticsearch-env文件,set JAVA_HOME=jdk11的路径,即可
es基本操作
es所支持的风格
get:获取
post:修改
put:添加
delete:删除
创建索引
在postman向es发送put请求 http:://127.0.0.1:9200/shopping
当你索引创建成功后-再想通过put创建相同的索引会报错,put幂等
{
"error": {
"root_cause": [
{
"type": "resource_already_exists_exception",
"reason": "index [shoppingg/G5fil2wXS6On0_rJa1fYtw] already exists",
"index_uuid": "G5fil2wXS6On0_rJa1fYtw",
"index": "shoppingg"
}
],
"type": "resource_already_exists_exception",
"reason": "index [shoppingg/G5fil2wXS6On0_rJa1fYtw] already exists",
"index_uuid": "G5fil2wXS6On0_rJa1fYtw",
"index": "shoppingg"
},
"status": 400
}
那如果使用post呢,post不是幂等的,不允许这样操作
{
"error": "Incorrect HTTP method for uri [/shoppingg] and method [POST], allowed: [HEAD, DELETE, GET, PUT]",
"status": 405
}
获取索引
get请求:http:://127.0.0.1:9200/shopping
{
"shoppingg": {
"aliases": {},
"mappings": {},
"settings": {
"index": {
"creation_date": "1618786330597",
"number_of_shards": "1",
"number_of_replicas": "1",
"uuid": "G5fil2wXS6On0_rJa1fYtw",
"version": {
"created": "7080099"
},
"provided_name": "shoppingg"
}
}
}
}
删除索引
delete : http:://127.0.0.1:9200/shopping
获取全部索引
get请求:http:127.0.0.1:9200/_cat/indinces?v
health status index uuid pri rep docs.count docs.deleted store.size pri.store.size
yellow open shoppingg G5fil2wXS6On0_rJa1fYtw 1 1 0 0 208b 208b
添加文档数据
post请求: http:127.0.0.1:9200/shopping/_doc
数据为body中,请求方式为json:
{
"title":"小米手机","category":"小米","images":"http://www.gulixueyuan.com/xm.jpg","price":3900.00
}
添加成功后会返回数据集:
{
"_index": "shopping",
"_type": "_doc",
"_id": "YKtY53gBLVBklMqda4mp",
"_version": 1,
"result": "created",
"_shards": {
"total": 2,
"successful": 1,
"failed": 0
},
"_seq_no": 0,
"_primary_term": 1
}
post请求的id新增数据是随机生成的,多次相同的请求会生效,因为id不一样
我们一般都是通过id查询数据的,那么如何使用自己的id呢?
新增文档数据-自定义id
post请求: http:127.0.0.1:9200/shopping/_doc/1001
如果id存在,那么直接将数据全部update替换
数据为body中,请求方式为json:
{
"title":"小米手机","category":"小米","images":"http://www.gulixueyuan.com/xm.jpg","price":3900.00
}
对于post请求/_doc就是新增 / _update就是修改
修改数据
post : localhost:9200/shopping/_update/1002
BODY:
{
"doc": {
"title": "小米手机12",
"category": "小米12",
"images": "http://www.gulixueyuan.com/xm.jpg",
"price": 3900.00
}
}{
"_index": "shopping",
"_type": "_doc",
"_id": "1002",
"_version": 4,
"result": "updated",
"_shards": {
"total": 2,
"successful": 1,
"failed": 0
},
"_seq_no": 10,
"_primary_term": 1
}
查询数据
get 请求:http:127.0.0.1:9200/shopping/_doc/1001
{
"_index": "shopping",
"_type": "_doc",
"_id": "1001",
"_version": 1,
"_seq_no": 3,
"_primary_term": 1,
"found": true,
"_source": {
"title": "小米手机",
"category": "小米",
"images": "http://www.gulixueyuan.com/xm.jpg",
"price": 3900.00
}
}
修改文档
put :http:127.0.0.1:9200/shopping/_doc/1003
{
"title":"小米手机222"
}
添加文档数据-id不能重复
put :http:127.0.0.1:9200/shopping/_create/1003
id重复会出现异常
{
"error": {
"root_cause": [
{
"type": "version_conflict_engine_exception",
"reason": "[1003]: version conflict, document already exists (current version [1])",
"index_uuid": "oQ0XOQPvSQmtXijIHbb-4w",
"shard": "0",
"index": "shopping"
}
],
"type": "version_conflict_engine_exception",
"reason": "[1003]: version conflict, document already exists (current version [1])",
"index_uuid": "oQ0XOQPvSQmtXijIHbb-4w",
"shard": "0",
"index": "shopping"
},
"status": 409
}
如果不传id会报错
{
"error": "Incorrect HTTP method for uri [/shopping/_create] and method [PUT], allowed: [POST]",
"status": 405
}
查询某个索引下的所有数据
get: localhost:9200/shopping/_search
{
"took": 33,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"skipped": 0,
"failed": 0
},
"hits": {
"total": {
"value": 6,
"relation": "eq"
},
"max_score": 1.0,
"hits": [
{
"_index": "shopping",
"_type": "_doc",
"_id": "YKtY53gBLVBklMqda4mp",
"_score": 1.0,
"_source": {
"title": "小米手机",
"category": "小米",
"images": "http://www.gulixueyuan.com/xm.jpg",
"price": 3900.00
}
},
{
"_index": "shopping",
"_type": "_doc",
"_id": "1001",
"_score": 1.0,
"_source": {
"title": "小米手机",
"category": "小米",
"images": "http://www.gulixueyuan.com/xm.jpg",
"price": 3900.00
}
},
{
"_index": "shopping",
"_type": "_doc",
"_id": "Yatg53gBLVBklMqdd4ku",
"_score": 1.0,
"_source": {
"title": "小米手机",
"category": "小米",
"images": "http://www.gulixueyuan.com/xm.jpg",
"price": 3900.00
}
},
{
"_index": "shopping",
"_type": "_doc",
"_id": "1002",
"_score": 1.0,
"_source": {
"title": "小米手机"
}
},
{
"_index": "shopping",
"_type": "_doc",
"_id": "1003",
"_score": 1.0,
"_source": {
"title": "小米手机"
}
},
{
"_index": "shopping",
"_type": "_doc",
"_id": "serach",
"_score": 1.0,
"_source": {
"title": "小米手机2"
}
}
]
}
}
删除文档
复杂查询-条件查询-会中文乱码
get :localhost:9200/shopping/_search?q=title:小米
这种搜索直接在参数拼接,容易出现中文乱码
复杂查询-条件查询
get :localhost:9200/_search
{"query":{
"match":{"title":"小米"}
}}
复杂查询-查询全部
复杂查询-条件查询+分页
get: localhost:9200/_search
{"query":{
"match_all":{}
},
"from":0,
"size":2
}
复杂查询-条件查询+分页 +显示某列内容
get : localhost:9200/_search
备注:分页然后只查询title
请求的 body:
{"query":{
"match_all":{}
},
"from":0,
"size":2,
"_source":["title"]
}
复杂查询-条件查询+对内容结果排序
get : localhost:9200/_search
备注:分页然后只查询title
请求的 body:
{"query":{
"match_all":{}
},
"sort":{
"price":{
"order":"asc"
}
}
}
多条件查询-查数据同时存在
localhost:9200/_search
query:代表查询
多个条件: bool
多个条件同时成立,必须的意思,里面是数组: must
或者的意思 should:
匹配的条件: match
get : localhost:9200/_search
body:
{"query":{
"bool":{
"must":[
{
"match":{
"category":"小米"
}}
,
{
"match":{
"price":"3900"
}
}
]
}
}
}
多条件查询-查数据或者存在
get : localhost:9200/_search
{"query":{
"bool":{
"should":[
{"match":{
"title":"小米"
}},{"match":{
"title":"华为"
}}
]
}
}}
多条件查询-查数据范围查找
get : localhost:9200/_search
{"query":{
"bool":{
"filter":{
"range":{"price":{
"gt":4000
}}
}
}
}}
需要注意,即使查询一个词也会查询出相关的数据,倒排索引的关系,全文检索
完全匹配操作
localhost:9200/_search
如果match_phrase 这个查询是完全匹配,如果match ,是倒排索引匹配,match_phrase 输入的不全可以匹配到带有相关名字的,但是不进行拆分,而match 是进行拆分匹配的。
{"query":{
"match_phrase":{
"title":"小米"
}
}
}
高亮显示
localhost:9200/_search
{"query":{
"match":{
"title":"小华"
}
}
,"highlight":{
"fields":{
"title":{}
}
}
}
聚合查询 aggs 分组terms
{
"aggs":{
"price_group":{//名称随意起
"terms":{
"field":"price"//分组字段
}
}
}
}
结果:是带着原始数据的,如果不要原始数据,可以增加 size:0
{
"aggs":{
"price_group":{
"terms":{
"field":"price"
}
}
},"size":0
}
求平均值 avg
{"aggs":{
"price_avg":{
"avg":{
"field":"price"
}
}
},"size":0
}
查看es映射关系
1.创建索引
put http://localhost:9200/user
2.创建结构信息
put http://127.0.0.1:9200/user/_mapping