二、Elasticsearch 六种搜索方式
查询结果解释
- took - 耗费多少毫秒
- time_out - 是否超时
- _shards - 数据分片情况
- hits.total - 查询结果的数量
- hits.max_score - document 对于一个 search 的相关度匹配分数，越相关分数越高
- hits.hits - 匹配 document 的详细数据
query string search
- 语法
GET /index/type/_search
查询全部商品
GET /ecommerce/product/_search
{
"took": 0,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"skipped": 0,
"failed": 0
},
"hits": {
"total": {
"value": 3,
"relation": "eq"
},
"max_score": 1,
"hits": [
{
"_index": "ecommerce",
"_type": "product",
"_id": "1",
"_score": 1,
"_source": {
"name": "gaolujie yagao",
"desc": "gaoxiao meibai",
"price": 30,
"producer": "gaolujie producer",
"tags": [
"meibai",
"fangzhu"
]
}
}
...
]
}
}
条件查询排序
查询商品名称中包含
yagao的商品，而且按照售价降序排序
GET /ecommerce/product/_search?q=name:yagao&sort=price:desc
query DSL 【常用】
Domain Specified Language：特定领域的语言
- 语法
GET /index/type/_search
{
"query": {
"match_all": {}
}
}
请求体放在
request body里面 ,可以用 json 格式来构建各种复杂的语法，比query string search强大
查询所有商品
GET /ecommerce/product/_search
{
"query": {
"match_all": {}
}
}
条件查询排序
查询商品名称中包含
yagao的商品，而且按照售价降序排序
GET /ecommerce/product/_search
{
"query": {
"match": {
"name": "yagao"
}
},
"sort": [
{
"price": "desc"
}
]
}
分页查询
当前总共3条商品数据，假设每页显示1条，现在显示第2页，所以只查出来第2个商品
GET /ecommerce/product/_search
{
"query":{
"match_all": {}
},
"from": 1,
"size": 1
}
查询指定属性
指定只查询商品的 name、price 属性
GET /ecommerce/product/_search
{
"query": {
"match_all": {}
},
"_source": [
"name",
"price"
]
}
query filter
范围查询
搜索商品名称包含 yaogao ，而且售价大于 25 元的商品
GET /ecommerce/product/_search
{
"query": {
"bool": {
"must": [
{
"match": {
"name": "yagao"
}
}
],
"filter": {
"range": {
"price": {
"gt": 25
}
}
}
}
}
}
- gt : 大于
- lt : 小于
- eq : 等于
- ne : 不等于
- gte : 大于等于
- lte : 小于等于
full-text search
全文检索 - 会将输入的
关键字拆解，去倒排索引里面一一匹配，只要匹配上任意一个拆解后的单词，就可以作为结果返回
- 先新增一条数据
PUT /ecommerce/product/4
{
"name": "special yagao",
"desc": "special meibai",
"price": 50,
"producer": "special yagao producer",
"tag": [
"meibai"
]
}
- 查询 producer
GET /ecommerce/product/_search
{
"query":{
"match": {
"producer":"yagao producer"
}
}
}
- 查询结果展示
{
"took": 2,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"skipped": 0,
"failed": 0
},
"hits": {
"total": {
"value": 4,
"relation": "eq"
},
"max_score": 1.2825179,
"hits": [
{
"_index": "ecommerce",
"_type": "product",
"_id": "4",
"_score": 1.2825179,
"_source": {
"name": "special yagao",
"desc": "special meibai",
"price": 50,
"producer": "special yagao producer",
"tag": [
"meibai"
]
}
},
{
"_index": "ecommerce",
"_type": "product",
"_id": "3",
"_score": 0.09037233,
"_source": {
"name": "zhonghua yagao",
"desc": "caoben zhiwu",
"price": 40,
"producer": "zhonghua producer",
"tags": [
"qingxin",
"fangzhu"
]
}
},
{
"_index": "ecommerce",
"_type": "product",
"_id": "2",
"_score": 0.09037233,
"_source": {
"name": "jiajieshi yagao",
"desc": "youxiao fangzhu",
"price": 25,
"producer": "jiajieshi producer",
"tags": [
"fangzhu"
]
}
},
{
"_index": "ecommerce",
"_type": "product",
"_id": "1",
"_score": 0.09037233,
"_source": {
"name": "gaolujie yagao",
"desc": "gaoxiao meibai",
"price": 30,
"producer": "gaolujie producer",
"tags": [
"name"
]
}
}
]
}
}
当
yagao producer作为查询条件时会被拆分成yagao、producer两个查询条件，但是查询结果的_score会体现跟原始查询条件的匹配度
phrase search
短语搜索 - 跟全文检索相反，搜索
关键字必须在指定的字段文本中完全匹配
GET /ecommerce/product/_search
{
"query": {
"match_phrase": {
"producer": "yagao producer"
}
}
}
highlight search
高亮搜索 - 被匹配的关键字将会在查询结果中高亮标注（默认
）
GET /ecommerce/product/_search
{
"query": {
"match": {
"producer": "producer"
}
},
"highlight": {
"fields": {
"producer": {}
}
}
}