spring Data JPA 集成solr7（八）

最新推荐文章于 2024-11-03 15:52:11 发布

沉默的小蜗牛

最新推荐文章于 2024-11-03 15:52:11 发布

阅读量1.6k

点赞数

CC 4.0 BY-SA版权

分类专栏： spring java

本文链接：https://blog.youkuaiyun.com/qq_32778043/article/details/80825852

java 同时被 2 个专栏收录

32 篇文章

订阅专栏

spring

7 篇文章

订阅专栏

本文介绍了Solr中可用的功能表达式，包括货币、默认值、距离等内置函数，并展示了如何通过实时获取功能检索最新文档版本，无需重新打开搜索器。此外，还提到了使用@Score注解来加载查询结果的评分信息。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

4.14. Using Functions

Solr supports several functional expressions within queries. Followig functions are supported out of the box. Custom functions can be added by implementing Function

Table 3. Functions
Class	Solr Function
`CurrencyFunction`	`currency(field_name,[CODE])`
`DefaultValueFunction`	`def(field\|function,defaultValue)`
`DistanceFunction`	`dist(power, pointA, pointB)`
`DivideFunction`	`div(x,y)`
`ExistsFunction`	`exists(field\|function)`
`GeoDistanceFunction`	`geodist(sfield, latitude, longitude)`
`GeoHashFunction`	`geohash(latitude, longitude)`
`IfFunction`	`if(value\|field\|function,trueValue,falseValue)`
`MaxFunction`	`max(field\|function,value)`
`NotFunction`	`not(field\|function)`
`ProductFunction`	`product(x,y,…)`
`QueryFunction`	`query(x)`
`TermFrequencyFunction`	`termfreq(field,term)`

SimpleQuery query = new SimpleQuery(new SimpleStringCriteria("text:ipod"));
query.addFilterQuery(new FilterQuery(Criteria.where(QueryFunction.query("name:sol*"))));

4.15. Realtime Get

The realtime get allows retrieval of the latest version of any document using the unique-key, without the need to reopen searchers.

realtime get relies on the update log feature.

Example 58. Realtime get

Optional<Product> product = solrTemplate.getById("collection-1", "123", Product.class);

Multiple documents can be retrieved by providing a collection of ids as follows:

Example 59. Realtime multi-get

Collection<String> ids = Arrays.asList("123", "134");
Collection<Product> products = solrTemplate.getByIds("collection-1", ids, Product.class);

4.16. Special Fields

4.16.1. @Score

In order to load score information of a query result, a field annotated with @Score annotation could be added, indicating the property holding the documents score.

The score property needs to be numerical and can only appear once per document.

public class MyEntity {

    @Id
    private String id;

    @Score
    private Float score;

    // setters and getters ...

}