Spring Data JPA的findFirst和findTop之间的技术差异 [英] Technical differences between Spring Data JPA's findFirst and findTop

问题描述

我最近开始使用Spring data jpa.

I recently started working with Spring data jpa.

如果有人可以对 Spring Data JPA的 findFirst 之间的 技术差异 有所了解，那将是非常有意义的>和 findTop .

It would be highly appreciable if somebody could throw some light on the technical differences between Spring Data JPA's findFirst and findTop.

差异，用法.

谢谢

推荐答案

来自可以通过关键字 first 或 top 限制查询方法的结果，这些关键字可以互换使用.可以将一个可选数值附加到 top/first 上，以指定要返回的最大结果大小.如果省略该数字，则假定结果大小为1.

The results of query methods can be limited via the keywords first or top, which can be used interchangeably. An optional numeric value can be appended to top/first to specify the maximum result size to be returned. If the number is left out, a result size of 1 is assumed.

User findFirstByOrderByLastnameAsc();

User findTopByOrderByAgeDesc();

Page<User> queryFirst10ByLastname(String lastname, Pageable pageable);

Slice<User> findTop3ByLastname(String lastname, Pageable pageable);

List<User> findFirst10ByLastname(String lastname, Sort sort);

List<User> findTop10ByLastname(String lastname, Pageable pageable);

限制表达式还支持 Distinct 关键字.另外，对于将结果集限制为一个实例的查询，支持将结果包装到Optional中.

The limiting expressions also support the Distinct keyword. Also, for the queries limiting the result set to one instance, wrapping the result into an Optional is supported.

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