基础名词
es和mysql对应关系(容易理解)
索引 ==>数据库
类型 ==>数据表
文档 ==>一行记录
1.创建people索引 (postman创建)
PUT:127.0.0.1:9200/people
{
"settings":{
"number_of_shards":3,
"number_of_replicas":0
},
"mappings":{
"man": {
"properties": {
"name": {
"type": "text"
},
"country":{
"type":"keyword"
},
"age":{
"type":"integer"
},
"date":{
"type":"date"
}
}
},
"woman": {}
}
}
返回结果:
{
"acknowledged": true,
"shards_acknowledged": true,
"index": "people"
}
2.插入数据 ,people为索引,man为类型,1为指定的id
PUT:127.0.0.1:9200/people/man/1
{
"name":"season",
"country":"china",
"age":22,
"date":"1990-01-03"
}
返回结果:
{
"_index": "people",
"_type": "man",
"_id": "1",
"_version": 1,
"result": "created",
"_shards": {
"total": 1,
"successful": 1,
"failed": 0
},
"created": true
}
3.插入数据 ,people为索引,man为类型,自动ID
POST:127.0.0.1:9200/people/man
{
"name":"王一",
"country":"china",
"age":26,
"date":"1990-01-02"
}
返回结果:
{
"_index": "people",
"_type": "man",
"_id": "AWOknfrbJy0Qc746PXrH",
"_version": 1,
"result": "created",
"_shards": {
"total": 1,
"successful": 1,
"failed": 0
},
"created": true
}
查看我们添加的数据:
image.png
4.根据ID修改数据(直接修改文档)
POST:127.0.0.1:9200/people/man/1/_update
{
"doc":{
"name":"我是season"
}
}
返回结果:
{
"_index": "people",
"_type": "man",
"_id": "1",
"_version": 2,
"result": "updated",
"_shards": {
"total": 1,
"successful": 1,
"failed": 0
}
}
查看数据:
image.png
5.使用脚本方式修改数据
POST:127.0.0.1:9200/people/man/1/_update
{
"script":{
"lang":"painless",
"inline":"ctx._source.age +=10"
}
}
数据返回:
{
"_index": "people",
"_type": "man",
"_id": "1",
"_version": 3,
"result": "updated",
"_shards": {
"total": 1,
"successful": 1,
"failed": 0
}
}
查看数据:
image.png
6.删除文档
DELETE:127.0.0.1:9200/people/man/1
返回结果:
{
"found": true,
"_index": "people",
"_type": "man",
"_id": "1",
"_version": 4,
"result": "deleted",
"_shards": {
"total": 1,
"successful": 1,
"failed": 0
}
}
查看数据:
image.png
7.删除索引(危险操作)
DELETE:127.0.0.1:9200/people
在做查询前,随便添加了些测试数据:
测试数据
7.简单查询
GET:127.0.0.1:9200/people/man/1
返回数据:
{
"_index": "people",
"_type": "man",
"_id": "1",
"_version": 3,
"found": true,
"_source": {
"name": "苑畅",
"country": "china",
"age": 50,
"date": "1990-01-03"
}
}
8.条件查询
8.1查询全部 (默认显示前十条)
POST:127.0.0.1:9200/people/_search
{
"query":{
"match_all":{}
}
}
或者(查询一条)
{
"query":{
"match_all":{}
},
"from":1,
"size":1
}
返回数据:
{
"took": 2,
"timed_out": false,
"_shards": {
"total": 3,
"successful": 3,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 5,
"max_score": 1,
"hits": [
{
"_index": "people",
"_type": "man",
"_id": "AWOknfrbJy0Qc746PXrH",
"_score": 1,
"_source": {
"name": "王一",
"country": "china",
"age": 26,
"date": "1990-01-02"
}
},
{
"_index": "people",
"_type": "man",
"_id": "2",
"_score": 1,
"_source": {
"name": "苑畅",
"country": "china",
"age": 50,
"date": "1990-01-03"
}
},
..........
}
]
}
}
其中:took表示花费时间(毫秒),hits表示结果
8.2查询并排序
POST:127.0.0.1:9200/people/_search
{
"query":{
"match":{
"name":"苑畅"
}
},
"sort":[
{"age":{"order":"desc"}}
]
}
返回结果:
{
"took": 2,
"timed_out": false,
"_shards": {
"total": 3,
"successful": 3,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 2,
"max_score": null,
"hits": [
{
"_index": "people",
"_type": "man",
"_id": "2",
"_score": null,
"_source": {
"name": "苑畅",
"country": "china",
"age": 50,
"date": "1990-01-03"
},
"sort": [
50
]
},
{
"_index": "people",
"_type": "man",
"_id": "1",
"_score": null,
"_source": {
"name": "苑畅",
"country": "china",
"age": 50,
"date": "1990-01-03"
},
"sort": [
50
]
}
]
}
}
9.聚合查询
POST:127.0.0.1:9200/people/_search
{
"aggs":{
"group_by_age":{
"terms":{
"field":"age"
}
}
}
}
返回内容:
{
"took": 33,
"timed_out": false,
"_shards": {
"total": 3,
"successful": 3,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 5,
"max_score": 1,
"hits": [
{
"_index": "people",
"_type": "man",
"_id": "AWOknfrbJy0Qc746PXrH",
"_score": 1,
"_source": {
"name": "王一",
"country": "china",
"age": 26,
"date": "1990-01-02"
}
},
.......
}
]
},
"aggregations": {
"group_by_age": {
"doc_count_error_upper_bound": 0,
"sum_other_doc_count": 0,
"buckets": [
{
"key": 50,
"doc_count": 4
},
{
"key": 26,
"doc_count": 1
}
]
}
}
}
9.高级查询
9.1子条件查询
a.模糊匹配
POST:127.0.0.1:9200/people/_search
{
"query":{
"match":{
"name":"苑畅李"
}
}
}
返回结果
{
"took": 2,
"timed_out": false,
"_shards": {
"total": 3,
"successful": 3,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 3,
"max_score": 1.7600523,
"hits": [
{
"_index": "people",
"_type": "man",
"_id": "2",
"_score": 1.7600523,
"_source": {
"name": "苑畅",
"country": "china",
"age": 50,
"date": "1990-01-03"
}
},
{
"_index": "people",
"_type": "man",
"_id": "1",
"_score": 1.2438203,
"_source": {
"name": "苑畅",
"country": "china",
"age": 50,
"date": "1990-01-03"
}
},
{
"_index": "people",
"_type": "man",
"_id": "4",
"_score": 0.88002616,
"_source": {
"name": "李垦",
"country": "china",
"age": 50,
"date": "1990-01-03"
}
}
]
}
}
如果我们改成"match_phrase":....结果就是空
b.多字段匹配
{
"query":{
"multi_match":{
"query":"李",
"fields":["name","country"]
}
}
}
返回结果:
{
"took": 7,
"timed_out": false,
"_shards": {
"total": 3,
"successful": 3,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 1,
"max_score": 0.88002616,
"hits": [
{
"_index": "people",
"_type": "man",
"_id": "4",
"_score": 0.88002616,
"_source": {
"name": "李垦",
"country": "china",
"age": 50,
"date": "1990-01-03"
}
}
]
}
}
9.2复合条件查询
附:
1.查看单节点Elasticsearch健康状态
http://127.0.0.1:9200/_cluster/health?pretty
image.png
2.单节点出现Unassigned,健康值为yellow问题:
单节点记得设置number_of_replicas为0,不然会出现下面这种情况.
image.png
出现上述情况的原因是因为:存在5个unassigned的分片，新建索引blog5的时候，分片数为5，副本数为1，新建之后集群状态成为yellow，其根本原因是因为集群存在没有启用的副本分片