数据查询
返回所有记录
请求方法：GET，路径：/index/type/_search
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| curl --location --request GET 'localhost:9200/blog/doc/_search'
|
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| {
"took": 6,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"skipped": 0,
"failed": 0
},
"hits": {
"total": {
"value": 1,
"relation": "eq"
},
"max_score": 1.0,
"hits": [
{
"_index": "blog",
"_type": "doc",
"_id": "jV3J-HIBNIzRDJgGMzQj",
"_score": 1.0,
"_source": {
"title": "java编程思想",
"price": 99.99,
"description": "本书赢得了全球程序员的广泛赞誉，即使是最晦涩的概念，在Bruce Eckel的文字亲和力和小而直接的编程示例面前也会化解于无形。从Java的基础语法到最高级特性（深入的面向对象概念、多线程、自动项目构建、单元测试和调试等），本书都能逐步指导你轻松掌握。",
"author": "埃克尔"
}
}
]
}
}
|
其中字段含义：
- total:返回记录的条数
- hits:返回记录的数组
- max_score:最高匹配的程度
全文本查询
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| curl --location --request POST 'http://localhost:9200/blog/doc/_search' \
--header 'Content-Type: application/json' \
--data-raw '{
"query":{
"match":{
"title":"java"
}
}
}'
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| {
"took": 1,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"skipped": 0,
"failed": 0
},
"hits": {
"total": {
"value": 3,
"relation": "eq"
},
"max_score": 0.40388194,
"hits": [
{
"_index": "blog",
"_type": "doc",
"_id": "jV3J-HIBNIzRDJgGMzQj",
"_score": 0.40388194,
"_source": {
"title": "java编程思想",
"price": 99.99,
"author": "埃克尔"
}
},
{
"_index": "blog",
"_type": "doc",
"_id": "Jsrp_XIBKoNLJaiRi4mV",
"_score": 0.35667494,
"_source": {
"title": "Java并发编程实战",
"price": 69,
"author": " Brian Goetz"
}
},
{
"_index": "blog",
"_type": "doc",
"_id": "J8rq_XIBKoNLJaiRW4n4",
"_score": 0.33698124,
"_source": {
"title": "Effective java 中文版（第2版）",
"price": 52.00,
"author": " [美] Joshua Bloch"
}
}
]
}
}
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由返回的结果可以看出，elasticsearch返回了标题为java的文档，但match是模糊匹配，他会把查询的词先进行分词然后再去查询。例如下图的示例
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| curl --location --request POST 'http://localhost:9200/blog/doc/_search' \
--header 'Content-Type: application/json' \
--data-raw '{
"query":{
"match":{
"title":"编程思想"
}
}
}'
|
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| {
"took": 2,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"skipped": 0,
"failed": 0
},
"hits": {
"total": {
"value": 2,
"relation": "eq"
},
"max_score": 4.296419,
"hits": [
{
"_index": "blog",
"_type": "doc",
"_id": "jV3J-HIBNIzRDJgGMzQj",
"_score": 4.296419,
"_source": {
"title": "java编程思想",
"price": 99.99,
"author": "埃克尔"
}
},
{
"_index": "blog",
"_type": "doc",
"_id": "Jsrp_XIBKoNLJaiRi4mV",
"_score": 1.3862944,
"_source": {
"title": "Java并发编程实战",
"price": 69,
"author": " Brian Goetz"
}
}
]
}
}
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由上图结果可以看到的确是进行了分词，那如果我们有时候不想要这样查询呢？我们可以换一个关键字match_phrase
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| curl --location --request POST 'http://localhost:9200/blog/doc/_search' \
--header 'Content-Type: application/json' \
--data-raw '{
"query":{
"match_phrase":{
"title":"编程思想"
}
}
}'
|
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| {
"took": 100,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"skipped": 0,
"failed": 0
},
"hits": {
"total": {
"value": 1,
"relation": "eq"
},
"max_score": 4.296419,
"hits": [
{
"_index": "blog",
"_type": "doc",
"_id": "jV3J-HIBNIzRDJgGMzQj",
"_score": 4.296419,
"_source": {
"title": "java编程思想",
"price": 99.99,
"author": "埃克尔"
}
}
]
}
}
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多字段查询
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| {
"query":{
"multi_match":{
"query":"java",
"fields":[
"title",
"description"
]
}
}
}
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语法查询
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| {
"query":{
"query_string":{
"query":"编程思想 and c++"
}
}
}
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字段查询
