从入门到进阶之 ElasticSearch SpringData 继承篇-编程知识

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Spring Data

Spring Data 是一个用于简化数据库、非关系型数据库、索引库访问，并支持云服务的开源框架。其主要目标是使得对数据的访问变得方便快捷，并支持 map-reduce 框架和云计算数据服务。 Spring Data 可以极大的简化JPA (Elasticsearch.·.)的写法，在几乎不用写实现的情况下，实现对数据的访问和操作。除了 CRUD 外，还包括如分页、排序等功能

Spring DataLevel up your Java code and explore what Spring can do for you.https://spring.io/projects/spring-data

POM

        <dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-elasticsearch</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><scope>runtime</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId></dependency>

项目结构

配置

@Data
@Configuration
@ConfigurationProperties(prefix = "elasticsearch")
public class ElasticSearchConfig extends AbstractElasticsearchConfiguration {private String host;private Integer port;@Overridepublic RestHighLevelClient elasticsearchClient() {String scheme = "http";return new RestHighLevelClient(RestClient.builder(new HttpHost(host, port, scheme)));}
}

实体

@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Document(indexName = "product", shards = 3, replicas = 1)
public class Product {/*** 商品唯一标识*/@Idprivate Long id;/*** 商品名称*/@Field(type = FieldType.Text)private String title;/*** 分类名称*/@Field(type = FieldType.Keyword)private String category;/*** 商品价格*/@Field(type = FieldType.Double)private Double price;/*** 图片地址*/@Field(type = FieldType.Keyword, index = false)private String images;
}

Dao

测试类

import com.mcp.es.entity.Product;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate;
import org.springframework.test.context.junit4.SpringRunner;@SpringBootTest
@RunWith(SpringRunner.class)
class EsSpringApplicationTests {@Autowiredprivate ElasticsearchRestTemplate template;}

创建索引

// 将根据实体类中的配置参数，自动创建索引	
@Testvoid createIndex() {System.out.println("自动创建索引");}

索引操作

文档

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringDataEsRepositoryTest {@Autowiredprivate ProductRepository repository;
}

基础操作

	@Testpublic void save(){Product product = new Product();product.setId(1000L);product.setTitle("华为手机");product.setCategory("手机");product.setPrice(2999.0);product.setImages("http://www.atguigu/hw.jpg");repository.save(product);}

//修改@Testpublic void update(){Product product = new Product();product.setId(1000L);product.setTitle("小米 2 手机");product.setCategory("手机");product.setPrice(9999.0);product.setImages("http://www.atguigu/xm.jpg");repository.save(product);}

	//根据 id 查询@Testpublic void findById(){Product product = repository.findById(1000L).get();System.out.println(product);}

	@Testpublic void findAll(){Iterable<Product> products = repository.findAll();for (Product product : products) {System.out.println(product);}}

	//删除@Testpublic void delete(){Product product = new Product();product.setId(1000L);repository.delete(product);}

//批量新增@Testpublic void saveAll(){List<Product> productList = new ArrayList<>();for (int i = 0; i < 10; i++) {Product product = new Product();product.setId(Long.valueOf(i));product.setTitle("["+i+"]小米手机");product.setCategory("手机");product.setPrice(1999.0 + i);product.setImages("http://www.atguigu/xm.jpg");productList.add(product);}repository.saveAll(productList);}

	//分页查询@Testpublic void findByPageable(){//设置排序(排序方式，正序还是倒序，排序的 id)Sort sort = Sort.by(Sort.Direction.DESC,"id");int currentPage=0;//当前页，第一页从 0 开始， 1 表示第二页int pageSize = 5;//每页显示多少条//设置查询分页PageRequest pageRequest = PageRequest.of(currentPage, pageSize,sort);//分页查询Page<Product> productPage = repository.findAll(pageRequest);for (Product Product : productPage.getContent()) {System.out.println(Product);}}

文档搜索

/*** term 查询* search(termQueryBuilder) 调用搜索方法，参数查询构建器对象*/@Testpublic void termQuery(){TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", "小米");Iterable<Product> products = repository.search(termQueryBuilder);for (Product product : products) {System.out.println(product);}}/*** term 查询加分页*/@Testpublic void termQueryByPage(){int currentPage= 0 ;int pageSize = 5;//设置查询分页PageRequest pageRequest = PageRequest.of(currentPage, pageSize);TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", "小米");Iterable<Product> products =repository.search(termQueryBuilder,pageRequest);for (Product product : products) {System.out.println(product);}}