elasticsearch 搜索方式
声明：本文仅仅只是记个笔记
搜索方式
1. query string search
1) 搜索全部商品：GET /ecommerce/product/_search
took ：耗费了几毫秒
timed_out:是否超时，这里没有
_shareds: 数据拆成1哥分片，所以对于搜索请求，会打造所有的primary shard (或者是它的某个replica shard也可以)
hits.total ：查询结果的数量，这里有 3 个 document
max_score : score的含义就是document对于一个search的相关度的匹配分数，越相关，就越匹配，分数也越高
hist.hits：包含了匹配搜索的document的详细数据
结果：
{
"took" : 5,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 3,
"relation" : "eq"
},
"max_score" : 1.0,
"hits" : [
{
"_index" : "ecommerce",
"_type" : "product",
"_id" : "2",
"_score" : 1.0,
"_source" : {
"name" : "jiajieshi yagao",
"desc" : "youxiao fangzhu",
"price" : 25,
"producer" : "jiajieshi producer",
"tags" : [
"fangzhu"
]
}
},
{
"_index" : "ecommerce",
"_type" : "product",
"_id" : "3",
"_score" : 1.0,
"_source" : {
"name" : "zhonghua yagao",
"desc" : "caoben zhiwu",
"price" : 40,
"producer" : "zhonghua producer",
"tags" : [
"qingxin"
]
}
},
{
"_index" : "ecommerce",
"_type" : "product",
"_id" : "1",
"_score" : 1.0,
"_source" : {
"name" : "gaolujie yagao",
"desc" : "gaoxiao meibai",
"price" : 30,
"producer" : "gaolujie producer",
"tags" : [
"meibai",
"fangzhu"
]
}
}
]
}
}
2）按条件搜索
搜索商品名中包含yagao的商品，而且按照售价降序排序：GET /ecommerce/product/_search?q=name:yagao&sort=price:desc
适用于临时的在命令行使用的一些工具，比如curl ，快速的发出请求，来检索想要的信息；但是如果查询请求很复杂，是很难去构建在生产环境中，几乎很好使用 query string search
2. query DSL
DSL ： domain Specific Language 特定领域的语言
1) 查询所有商品
GET /ecommerce/product/_search
{
"query": {
"match_all": {}
}
}2) 按条件查找
GET /ecommerce/product/_search
{
"query": {
"match": {
"name":"yagao"
}
},
"sort":[
{"price":"desc"}
]
}3）分页查询
先查询所有，再看显示哪条
from ：从哪条开始
size ： 显示几条
GET /ecommerce/product/_search
{
"query": {
"match_all": {}
},
"from": 1,
"size": 1
}4）指定要查询出来的商品名称和价格
GET /ecommerce/product/_search
{
"query": {
"match_all": {}
},
"_source": ["name","price"]
}3. query filter
搜索商品名称包含yagao，而且售价大于25的商品
GET /ecommerce/product/_search
{
"query": {
"bool": {
"must": {
"match":{
"name":"yagao"
}
},
"filter": {
"range": {
"price": {
"gt": 25
}
}
}
}
}
}4. full-text search (全文检索)
producer 字段会 先被拆除，后建立倒排索引
GET /ecommerce/product/_search
{
"query": {
"match": {
"producer": "yagao producer"
}
}
}结果：
{
"took" : 11,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 4,
"relation" : "eq"
},
"max_score" : 1.1522135,
"hits" : [
{
"_index" : "ecommerce",
"_type" : "product",
"_id" : "4",
"_score" : 1.1522135,
"_source" : {
"name" : "special yagao",
"desc" : "special meibai",
"price" : 50,
"producer" : "special yagao producer",
"tags" : [
"meibai"
]
}
},
{
"_index" : "ecommerce",
"_type" : "product",
"_id" : "2",
"_score" : 0.110377684,
"_source" : {
"name" : "jiajieshi yagao",
"desc" : "youxiao fangzhu",
"price" : 25,
"producer" : "jiajieshi producer",
"tags" : [
"fangzhu"
]
}
},
{
"_index" : "ecommerce",
"_type" : "product",
"_id" : "3",
"_score" : 0.110377684,
"_source" : {
"name" : "zhonghua yagao",
"desc" : "caoben zhiwu",
"price" : 40,
"producer" : "zhonghua producer",
"tags" : [
"qingxin"
]
}
},
{
"_index" : "ecommerce",
"_type" : "product",
"_id" : "1",
"_score" : 0.110377684,
"_source" : {
"name" : "gaolujie yagao",
"desc" : "gaoxiao meibai",
"price" : 30,
"producer" : "gaolujie producer",
"tags" : [
"meibai",
"fangzhu"
]
}
}
]
}
}
5. phrase search（短语搜索）
跟全文搜索相对应，相反，全文检索会将输入的搜索串拆解开来，去倒排索引里面去一一匹配，只要能匹配上任意一个拆解后的单词，就可以作为结果返回，phrase search 要求输入的搜索串，必须在指定的字段文本中，完全包含一模一样的，才可以算匹配，才能作为结果返回。
GET /ecommerce/product/_search
{
"query": {
"match_phrase": {
"producer": "yagao producer"
}
}
}6. highlight search (高亮搜索结果)
高亮凡是匹配的词在结果中都标红
GET /ecommerce/product/_search
{
"query": {
"match": {
"producer": "producer"
}
},
"highlight": {
"fields": {
"producer":{}
}
}
}结果：
#! Deprecation: [types removal] Specifying types in search requests is deprecated.
{
"took" : 153,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 4,
"relation" : "eq"
},
"max_score" : 0.110377684,
"hits" : [
{
"_index" : "ecommerce",
"_type" : "product",
"_id" : "2",
"_score" : 0.110377684,
"_source" : {
"name" : "jiajieshi yagao",
"desc" : "youxiao fangzhu",
"price" : 25,
"producer" : "jiajieshi producer",
"tags" : [
"fangzhu"
]
},
"highlight" : {
"producer" : [
"jiajieshi producer"
]
}
},
{
"_index" : "ecommerce",
"_type" : "product",
"_id" : "3",
"_score" : 0.110377684,
"_source" : {
"name" : "zhonghua yagao",
"desc" : "caoben zhiwu",
"price" : 40,
"producer" : "zhonghua producer",
"tags" : [
"qingxin"
]
},
"highlight" : {
"producer" : [
"zhonghua producer"
]
}
},
{
"_index" : "ecommerce",
"_type" : "product",
"_id" : "1",
"_score" : 0.110377684,
"_source" : {
"name" : "gaolujie yagao",
"desc" : "gaoxiao meibai",
"price" : 30,
"producer" : "gaolujie producer",
"tags" : [
"meibai",
"fangzhu"
]
},
"highlight" : {
"producer" : [
"gaolujie producer"
]
}
},
{
"_index" : "ecommerce",
"_type" : "product",
"_id" : "4",
"_score" : 0.09271725,
"_source" : {
"name" : "special yagao",
"desc" : "special meibai",
"price" : 50,
"producer" : "special yagao producer",
"tags" : [
"meibai"
]
},
"highlight" : {
"producer" : [
"special yagao producer"
]
}
}
]
}
}