Spring-Data-ES-template工具类使用

2024-07-11 18:36:03
开发
22

SpringDataElasticsearch 提供了一个工具类 ElasticsearchTemplate，我们使用该类对象也可以对 ES 进行操作

1.操作索引

首先注入操作ES所需要的工具类(ElasticsearchTemplate)。

@Autowired
    private ElasticsearchTemplate template;

将createIndex改为false

@Document(indexName = "product",createIndex = false)
@Data
@AllArgsConstructor
public class Product {

    @Id //标记在成员变量上，标记一个字段为主键，该字段的值会同步到ES该文档的id值
    //标记在成员变量上，标记为文档中的域，一般有如下属性-> type域的类型,index是否创建索引,store是否单独存储,analyzer分词器,searchAnalyzer搜索分词器
    @Field(type = FieldType.Integer,store = true,index = true)
    private Integer id;
    @Field(type = FieldType.Text,store = true,index = true,analyzer = "ik_max_word",searchAnalyzer = "ik_max_word")
    private String productName;
    @Field(type = FieldType.Text,store = true,index = true,analyzer = "ik_max_word",searchAnalyzer = "ik_max_word")
    private String productDesc;
}

1.1新增索引(不推荐)

不推荐原因：生成的索引中mappings为空，并不按照指定

@Test
    public void addIndex(){
        //获取索引操作对象
        IndexOperations indexOperations = template.indexOps(Product.class);
        //创建索引
        indexOperations.create();
    }

1.2删除索引

@Test
    public void deleteIndex(){
        //获取索引操作对象
        IndexOperations indexOperations = template.indexOps(Product.class);
        //删除索引
        indexOperations.delete();
    }

2.操作文档

2.1新增/修改文档

 //新增/修改 文档
    @Test
    public void addDocument(){
        Product product = new Product(5, "elasticsearch", "elasticsearch是一款非常好的分词器");
        template.save(product);
    }

2.2删除文档

@Test
    public void deleteDocument(){
        template.delete("5",Product.class);
    }

2.3查询文档

//根据id查询
@Test
    public void findDocument(){
        Product product = template.get("1", Product.class);
        System.out.println(product);
    }

3.查询文档

template的search方法可以查询文档

SearchHits < T > search ( Query query , Class < T > clazz ) ：查询文档， query 是查询条件对象， clazz 是结果类型。

3.1简单查询

@Test
    public void findDocuments(){
        //1.构造查询条件
        NativeQuery query=new NativeQueryBuilder()
                .withQuery(Queries.matchAllQueryAsQuery()).build();
        //2.查询
        SearchHits<Product> result = template.search(query, Product.class);
        //3.处理查询结果
        for (SearchHit<Product> productSearchHit : result) {
            System.out.println(productSearchHit.getContent());
        }
    }

3.2匹配查询

@Test
    public void findDocuments(){
        //1.构造查询条件
        NativeQuery query=new NativeQueryBuilder()
                .withQuery(Queries.matchQueryAsQuery("productDesc","手机",null,null))
                 .build();
        //2.查询
        SearchHits<Product> result = template.search(query, Product.class);
        //3.处理查询结果
        for (SearchHit<Product> productSearchHit : result) {
            System.out.println(productSearchHit.getContent());
        }
    }

4.复杂条件查询

    @Test
    public void findDocuments2(){
        String productName="三体";
        String productDesc="小说";
        //1.构造查询条件
        NativeQueryBuilder nativeQueryBuilder = new NativeQueryBuilder();
        //判断是否有查询条件
        if (productName== null && productDesc== null){
            //查询所有
            nativeQueryBuilder.withQuery(Queries.matchAllQueryAsQuery());
        }else {
            //构造bool查询
            BoolQuery.Builder boolQuery = QueryBuilders.bool();
            if (productName!=null){
                //构造must条件
                boolQuery.must(Queries.matchQueryAsQuery("productName",productName,null,null));
            }
            if (productDesc!=null){
              boolQuery.must(Queries.matchQueryAsQuery("productDesc",productDesc,null,null));
            }
            //构造查询条件
              nativeQueryBuilder.withQuery(boolQuery.build()._toQuery());
        }
        //构造查询条件
        NativeQuery query = nativeQueryBuilder.build();

        //2.查询
        SearchHits<Product> result = template.search(query, Product.class);
        //3.处理查询结果
        for (SearchHit<Product> productSearchHit : result) {
            System.out.println(productSearchHit.getContent());
        }
    }

5.分页查询

    @Test
    public void findDocuments3(){
        //1.构造查询条件
        //分页条件
        Pageable pageable = PageRequest.of(0, 3, Sort.by(Sort.Direction.DESC, "id"));
        NativeQuery query=new NativeQueryBuilder()
                .withQuery(Queries.matchAllQueryAsQuery())
                .withPageable(pageable)
                .build();
        //2.查询
        SearchHits<Product> result = template.search(query, Product.class);
        //3.处理查询结果
        ArrayList content = new ArrayList();
        for (SearchHit<Product> productSearchHit : result) {
            content.add(productSearchHit.getContent());

        }
        /**
         *封装page对象
         * 参数1：具体数据 参数2：分页条件对象 参数3：总条数
         */
        Page<PageImpl> page = new PageImpl(content, pageable, result.getTotalHits());
        System.out.println(page.getTotalElements());
        System.out.println(page.getTotalPages());
        System.out.println(page.getContent());

    }

6.结果排序

    @Test
    public void findDocumentSort(){
        //1.构造查询条件
        NativeQuery query=new NativeQueryBuilder()
                .withQuery(Queries.matchAllQueryAsQuery())
                //Sort.Direction.DESC 降序 Sort.Direction.ASC 升序
                .withSort(Sort.by(Sort.Direction.DESC,"id"))
                .build();
        //2.查询
        SearchHits<Product> result = template.search(query, Product.class);
        //3.处理查询结果
        for (SearchHit<Product> productSearchHit : result) {
            System.out.println(productSearchHit.getContent());
        }
    }

原文地址:https://blog.csdn.net/Victor998/article/details/140303761 本文来自互联网用户投稿，该文观点仅代表作者本人，不代表本站立场。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如若转载，请注明出处：https://www.suanlizi.com/kf/1811348722618077184.html 如若内容造成侵权/违法违规/事实不符，请联系《酸梨子》网邮箱：1419361763@qq.com进行投诉反馈，一经查实，立即删除！

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