英文:
Is there a @Query in spring Data Redis?
问题
我一直在阅读关于Spring Data Redis的内容，它与Spring Data JPA非常相似。
我有一个USER类，其键为用户ID，值为User对象。我正在尝试从存储这些数据的"/user"哈希中查找所有用户ID（键）。
Spring Data有一个很酷的特性，可以使用@Query，但显然在Spring Data Redis中无法工作。
@Query("Select c.key from User c")
Set<String> getAllUserKey();
我尝试了上面的代码，但它给我报错，说未识别属性Key。我已经查阅了文档和Google，我认为在spring-data redis中不能用这种方式实现。
只是想确认我的理解，还想了解一下处理这种情况的最佳方法是什么。我想收集关于在哈希下存储了多少键以及其他信息的统计数据，这在使用@Query时会非常容易实现。
英文:
I have been reading about spring Data Redis which is quite similar to spring data JPA.
I have a USER class that has key has user id and value as the User object. I am trying to find all the user id's (key) from the "/user" hash where this data is stored.
Spring data had this cool feature of using @Query which is apparently not working with spring data redis.
@Query("Select c.key from User c")
Set<String> getAllUserKey();
I have tried the above code but it is giving me error that unrecognized property Key. I have gone through the documentation and google and don't think so this can be done using spring-data redis.
Just wanted to confirm my understanding and also would like to know what is the best way to approach this use case. I want to gather statistics around how many keys are stored under a hash and other things which would have been very easy to do with @Query
答案1
得分: 1
我认为你可以使用 redisTemplate 和 redisTemplate.keys(" * ")。
英文:
I think you can use redisTemplate and redisTemplate.keys("*")
答案2
得分: 1
在Spring Data Redis中，搜索功能仅限于在Redis SETs中创建/维护的二级索引上进行搜索。Spring Data Redis提供了“自动实现仓库接口，包括支持自定义查询方法”的功能。因此，您可以使用简单的存储库支持的存储库搜索方法，例如findByXXXandYYY。
要获得完整的搜索功能，Redis引入了RediSearch（https://redis.io/docs/stack/search/quick_start/），这是一个与Redis Stack（https://redis.io/docs/stack/）打包在一起的搜索引擎，可用于在Redis中存储的HASH和JSON文档上进行搜索。
要从Spring中使用Redis Stack功能，可以使用Redis OM Spring（https://github.com/redis/redis-om-spring）。这是一个扩展Spring Data Redis以支持Redis Stack功能的库。尽管仍在早期开发阶段，但接近1.0版本发布（免责声明：我是该库的主要贡献者）。
使用OM，您可以为集合（Hash/JSON）创建搜索索引，并使用存储库方法进行更复杂的搜索，或者使用EntityStream类以类似Java流的API进行搜索。
英文:
No, in Spring Data Redis, the searching capability is limited to searching over secondary indices (created/maintained in Redis SETs). Spring Data Redis provides "Automatic implementation of Repository interfaces including support for custom query methods." So you can do simple repository-powered repo search methods like findByXXXandYYY.
To get full-search capabilities, Redis introduces RediSearch (https://redis.io/docs/stack/search/quick_start/), a search engine packaged with Redis Stack (https://redis.io/docs/stack/) that enables searching over HASHes and JSON documents stored in Redis.
To use Redis Stack features from Spring, there is Redis OM Spring (https://github.com/redis/redis-om-spring). A library that extends Spring Data Redis with Redis Stack functionality. It's still early in its development but getting close to a 1.0 release (disclaimer: I'm the main contributor to the library).
With OM you can create search indices for a collection (Hash/JSON) and user repositories methods to do more complex searching, or use the EntityStream class to search with a Java-streams-like API.
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