1、query string search
搜索全部商品：GET /ecommerce/product/_search
took：耗费了几毫秒
timed_out：是否超时，这里是没有
_shards：数据拆成了5个分片，所以对于搜索请求，会打到所有的primary shard（或者是它的某个replica shard也可以）
hits.total：查询结果的数量，3个document
hits.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，分数也高
hits.hits：包含了匹配搜索的document的详细数据
#返回值
{
"took": 6,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 3,
"max_score": 1,
"hits": [
{
"_index": "ecommerce",
"_type": "product",
"_id": "2",
"_score": 1,
"_source": {
"name": "jiajieshi yagao",
"desc": "youxiao fangzhu",
"price": 25,
"producer": "jiajieshi producer",
"tags": [
"fangzhu"
]
}
},
{
"_index": "ecommerce",
"_type": "product",
"_id": "1",
"_score": 1,
"_source": {
"name": "gaolujie yagao",
"desc": "gaoxiao meibai",
"price": 30,
"producer": "gaolujie producer",
"tags": [
"meibai",
"fangzhu"
]
}
},
{
"_index": "ecommerce",
"_type": "product",
"_id": "3",
"_score": 1,
"_source": {
"name": "zhonghua yagao",
"desc": "caoben zhiwu",
"price": 40,
"producer": "zhonghua producer",
"tags": [
"qingxin"
]
}
}
]
}
}
query string search的由来，因为search参数都是以http请求的query string来附带的
#搜索商品名称中包含yagao的商品，而且按照售价降序排序：
GET /ecommerce/product/_search?q=name:yagao&sort=price:desc
适用于临时的在命令行使用一些工具，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，是很难去构建的
在生产环境中，几乎很少使用query string search
2、query DSL
DSL：Domain Specified Language，特定领域的语言
http request body：请求体，可以用json的格式来构建查询语法，比较方便，可以构建各种复杂的语法，比query string search肯定强大多了
#查询所有商品
GET /ecommerce/product/_search
{
"query": {
"match_all": {}
}
}
#返回值与 GET /ecommerce/product/_search 相同
#查询名称包含yagao的商品，同时按照价格降序排序
GET /ecommerce/product/_search
{
"query": {
"match": {
"name":"yagao"
}
},
"sort": [
{
"price": "desc"
}
]
}
#分页查询商品，总共3条商品，假设每页就显示1条商品，现在显示第2页，所以就查出来第2个商品
GET /ecommerce/product/_search
{
"query": {
"match_all": {}
},
"from": 1, //从第几条数据开始
"size": 1 //查询多少条数据
}
#指定要查询出来商品的名称和价格字段就可以
GET /ecommerce/product/_search
{
"query": {
"match_all": {}
},
"_source": ["name","price"]
}
3、query filter（对数据进行过滤）
#搜索商品名称包含yagao，而且售价大于25元的商品（这里是有两个查询条件）
GET /ecommerce/product/_search
{
"query" : {
"bool" : { //多条件查询
"must" : { //必须满足
"match" : {
"name" : "yagao"
}
},
"filter" : { //过滤
"range" : { //范围过滤
"price" : { "gt" : 25 } //大于25
}
}
}
}
}
4、full-text search（全文检索）
#添加一条数据
PUT /ecommerce/product/4
{
"name":"special yagao",
"desc":"special meibai",
"price":50,
"producer":"special yagao producer",
"tags":["meibai"]
}
#全文检索
GET /ecommerce/product/_search
{
"query": {
"match": {
"producer": "yagao producer"
}
}
}
#过程
producer这个字段，会先被拆解，建立倒排索引
special 4
yagao 4
producer 1,2,3,4
gaolujie 1
zhognhua 3
jiajieshi 2
yagao producer 分解为 yagao和producer
#结果
{
"took": 2,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 4,
"max_score": 0.70293105, //匹配分数
"hits": [
{
"_index": "ecommerce",
"_type": "product",
"_id": "4",
"_score": 0.70293105,
"_source": {
"name": "special yagao",
"desc": "special meibai",
"price": 50,
"producer": "special yagao producer",
"tags": [
"meibai"
]
}
},
{
"_index": "ecommerce",
"_type": "product",
"_id": "1",
"_score": 0.25811607,
"_source": {
"name": "gaolujie yagao",
"desc": "gaoxiao meibai",
"price": 30,
"producer": "gaolujie producer",
"tags": [
"meibai",
"fangzhu"
]
}
},
{
"_index": "ecommerce",
"_type": "product",
"_id": "3",
"_score": 0.25811607,
"_source": {
"name": "zhonghua yagao",
"desc": "caoben zhiwu",
"price": 40,
"producer": "zhonghua producer",
"tags": [
"qingxin"
]
}
},
{
"_index": "ecommerce",
"_type": "product",
"_id": "2",
"_score": 0.1805489,
"_source": {
"name": "jiajieshi yagao",
"desc": "youxiao fangzhu",
"price": 25,
"producer": "jiajieshi producer",
"tags": [
"fangzhu"
]
}
}
]
}
}
5、phrase search（短语搜索）
跟全文检索相对应，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"
}
}
}
#返回
{
"took": 27,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 1,
"max_score": 0.70293105,
"hits": [
{
"_index": "ecommerce",
"_type": "product",
"_id": "4",
"_score": 0.70293105,
"_source": {
"name": "special yagao",
"desc": "special meibai",
"price": 50,
"producer": "special yagao producer",
"tags": [
"meibai"
]
}
}
]
}
}
6、highlight search（高亮搜索结果）
#实操
GET /ecommerce/product/_search
{
"query": {
"match_phrase": {
"producer": "yagao producer"
}
},
"highlight": { //高亮
"fields": {
"producer":{}
}
}
}
#返回
{
"took": 27,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 1,
"max_score": 0.70293105,
"hits": [
{
"_index": "ecommerce",
"_type": "product",
"_id": "4",
"_score": 0.70293105,
"_source": {
"name": "special yagao",
"desc": "special meibai",
"price": 50,
"producer": "special yagao producer",
"tags": [
"meibai"
]
},
"highlight": {
"producer": [
"special <em>yagao</em> <em>producer</em>"
]
}
}
]
}
}
