mapping属性
mapping是对索引库中文档的约束, 常见的mapping属性包括:
type
: 字段数据类型,常见的简单类型有:字符串
: text(可分词的文本), keyword(精确值, 例如: 品牌,国家)数值
: long, integer, short, byte, double, float布尔
: boolean日期
: date对象
: object
index
: 是否创建索引, 默认为trueanalyzer
: 使用哪种分词器properties
: 该字段的子字段
索引库操作
创建索引库
PUT /zyw
{
"mappings": {
"properties": {
"info": {
"type": "text",
"analyzer": "ik_smart"
},
"email": {
"type": "keyword",
"index": false
},
"name": {
"type": "object",
"properties": {
"firstName": {
"type": "keyword"
},
"lastName":{
"type":"keyword"
}
}
}
}
}
}
查看索引库
GET /zyw
删除索引库
DELETE /zyw
修改索引库, 添加新字段
索引库和mapping一旦创建无法修改, 但是可以添加新字段
PUT /zyw/_mapping
{
"properties": {
"age": {
"type": "integer"
}
}
}
文档操作
新增文档
POST /zyw/_doc/1
{
"info": "java是最好的语言",
"email": "zy@163.com",
"name": {
"firstName": "云",
"lastName": "赵"
}
}
查询文档
GET /zyw/_doc/1
删除文档
DELETE /zyw/_doc/1
修改文档
- 全量修改, 会删除旧文档, 添加新文档
PUT /zyw/_doc/1
{
"info": "java是最好的语言",
"email": "zy@163.com",
"name": {
"firstName": "云",
"lastName": "赵"
}
}
- 局部修改
POST /zyw/_update/1
{
"doc": {
"email": "test@163.com"
}
}
RestClient操作索引库
- 引入依赖
<dependency>
<groupId>org.elasticsearch.client</groupId>
<artifactId>elasticsearch-rest-high-level-client</artifactId>
<version>7.12.1</version>
</dependency>
注意:
springboot管理了elasticsearch的部分依赖, 查看springboot的依赖管理
我们需要在pom文件中定义这个版本值,覆盖springboot的
- HotelDoc.java
@Data
@NoArgsConstructor
public class HotelDoc {
private Long id;
private String name;
private String address;
private Integer price;
private Integer score;
private String brand;
private String city;
private String starName;
private String business;
private String location;
private String pic;
public HotelDoc(Hotel hotel) {
this.id = hotel.getId();
this.name = hotel.getName();
this.address = hotel.getAddress();
this.price = hotel.getPrice();
this.score = hotel.getScore();
this.brand = hotel.getBrand();
this.city = hotel.getCity();
this.starName = hotel.getStarName();
this.business = hotel.getBusiness();
this.location = hotel.getLatitude() + ", " + hotel.getLongitude();
this.pic = hotel.getPic();
}
}
- hotel索引库
{
"mappings": {
"properties": {
"id": {
"type": "keyword"
},
"name": {
"type": "text",
"analyzer": "ik_max_word",
"copy_to": "all"
},
"address": {
"type": "keyword",
"index": false
},
"price": {
"type": "integer"
},
"score": {
"type": "integer"
},
"brand": {
"type": "keyword",
"copy_to": "all"
},
"city": {
"type": "keyword"
},
"starName": {
"type": "keyword"
},
"business": {
"type": "keyword",
"copy_to": "all"
},
"location": {
"type": "geo_point"
},
"pic": {
"type": "keyword",
"index": false
},
"all": {
"type": "text",
"analyzer": "ik_max_word"
}
}
}
}
基于elasticsearch的规则, id用keyword
- 操作索引库
import com.zyw.elasticsearchdemo.constants.HotelConstants;
import org.apache.http.HttpHost;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.CreateIndexRequest;
import org.elasticsearch.client.indices.GetIndexRequest;
import org.elasticsearch.common.xcontent.XContentType;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import java.io.IOException;
public class ElasticsearchDemoApplicationTests {
private RestHighLevelClient client;
/**
* 删除索引库
*/
@Test
void deleteHotelIndex() throws IOException {
DeleteIndexRequest request = new DeleteIndexRequest("hotel");
client.indices().delete(request, RequestOptions.DEFAULT);
}
/**
* 判断索引库是否存在
*/
@Test
void existHotelIndex() throws IOException {
GetIndexRequest request = new GetIndexRequest("hotel");
boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);
System.out.println(exists ? "索引库已经存在" : "索引库不存在");
}
/**
* 创建索引库
*/
@Test
void createHotelIndex() throws IOException {
// 1.创建request对象
CreateIndexRequest request = new CreateIndexRequest("hotel");
// 2.准备请求的参数, DSL语句
request.source(HotelConstants.MAPPING_TEMPLATE, XContentType.JSON);
// 3. 发送请求
client.indices().create(request, RequestOptions.DEFAULT);
}
@BeforeEach
void setUp() {
this.client = new RestHighLevelClient(RestClient.builder(HttpHost.create("http://82.114.174.50:9200")));
}
@AfterEach
void tearDown() throws IOException {
client.close();
}
}
RestClient操作文档
import cn.hutool.json.JSONUtil;
import com.zyw.elasticsearchdemo.mapper.HotelMapper;
import com.zyw.elasticsearchdemo.pojo.Hotel;
import com.zyw.elasticsearchdemo.pojo.HotelDoc;
import org.apache.http.HttpHost;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.get.GetRequest;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.update.UpdateRequest;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.xcontent.XContentType;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import java.io.IOException;
import java.util.List;
@SpringBootTest
public class ElasticsearchDemoApplicationTests1 {
private RestHighLevelClient client;
@Autowired
private HotelMapper hotelMapper;
/**
* 删除文档
*/
@Test
void deleteDocument() throws IOException {
DeleteRequest request = new DeleteRequest("hotel", "200216665");
client.delete(request, RequestOptions.DEFAULT);
}
/**
* 修改文档-局部更新, 全量和创建一样
*/
@Test
void updateDocument() throws IOException {
UpdateRequest request = new UpdateRequest("hotel", "200216665");
request.doc("price", 2600, "starName", "六钻");
client.update(request, RequestOptions.DEFAULT);
}
/**
* 查询文档
*/
@Test
void getDocument() throws IOException {
// 准备request对象
GetRequest request = new GetRequest("hotel", "200216665");
// 发送请求
GetResponse response = client.get(request, RequestOptions.DEFAULT);
String json = response.getSourceAsString();
HotelDoc hotelDoc = JSONUtil.toBean(json, HotelDoc.class);
System.out.println(hotelDoc);
}
/**
* 新增文档
*/
@Test
void addDocument() throws IOException {
// 根据id查询酒店数据
Hotel hotel = hotelMapper.selectById(200216665);
// 转换为文档对象
HotelDoc hotelDoc = new HotelDoc(hotel);
// 准备request对象
IndexRequest request = new IndexRequest("hotel").id(hotel.getId().toString());
// 准备json文档
request.source(JSONUtil.toJsonStr(hotelDoc), XContentType.JSON);
// 发送请求
client.index(request, RequestOptions.DEFAULT);
}
/**
* 批量导入文档
*/
@Test
void batchAddDocument() throws IOException {
List<Hotel> hotels = hotelMapper.selectList(null);
BulkRequest request = new BulkRequest();
for (Hotel hotel : hotels) {
HotelDoc hotelDoc = new HotelDoc(hotel);
request.add(new IndexRequest("hotel").id(hotelDoc.getId().toString())
.source(JSONUtil.toJsonStr(hotelDoc), XContentType.JSON));
}
// 发送
client.bulk(request, RequestOptions.DEFAULT);
}
@BeforeEach
void setUp() {
this.client = new RestHighLevelClient(RestClient.builder(HttpHost.create("http://82.114.174.50:9200")));
}
@AfterEach
void tearDown() throws IOException {
client.close();
}
}
DSL查询语法
分类和基本语法
全文检索查询
全文检索查询, 会对用户输入内容分词, 常用于搜索框搜索
建议把多个字段copy到一个字段里
精确查询
地理查询
复合查询
- 复合(compound)查询: 复合查询可以将其他简单查询组合起来, 实现更复杂的搜索逻辑.
function score
: 复分函数查询, 可以控制文档相关性算分, 控制文档排名. 例如百度竞价
搜索结果处理
排序
分页
高亮
默认字段要一致, 可以用require_field_match
取消一致
RestClient查询文档–高级查询
补充
- 分词
POST /_analyze
{
"text": "java是最好的语言",
"analyzer": "ik_smart"
}
- 查所有
GET /hotel/_search