Abdullah Khan :
I recently started working with Spring data jpa.
It would be highly appreciable if somebody could throw some light on the technical differences between Spring Data JPA's findFirst
and findTop
.
Differences, usages.
Thanks
SkyWalker :
From Spring Data JPA - Reference Documentation,
Limiting query results
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.
Limiting the result size of a query with Top and First
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);
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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