从入门到进阶 之 ElasticSearch SpringData 继承篇

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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;
	
	@Override
	public 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
	 */
	@Id
	private 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 {
	@Autowired
	private ElasticsearchRestTemplate template;
	
}

创建索引

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

索引操作

文档 

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

 基础操作

	@Test
	public 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
	@Test
	public 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
	@Test
	public void findById(){
		Product product = repository.findById(1000L).get();
		System.out.println(product);
	}

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

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

 

//批量新增
	@Test
	public 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
	@Test
	public 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
	 */
	@Test
	public 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
	 */
	@Test
	public 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);
		}
	}