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                ## 一、概述 JPA基本查詢也分為兩種,一種是spring data默認已經實現,一種是自定義的簡單查詢,可以根據方法名來自動生成SQL,也可以通過@Query注解實現復雜的查詢; ## 二、查詢 ~~~ User findFirstByOrderByLastnameAsc(); User findTopByOrderByAgeDesc(); CardInfo findTopByCardSource(long cardSource); Page queryFirst10ByLastname(String lastname, Pageable pageable); Slice findTop3ByLastname(String lastname, Pageable pageable); List findFirst10ByLastname(String lastname, Sort sort); List findTop10ByLastname(String lastname, Pageable pageable); Optional findOptionalByEmailAddress(EmailAddress emailAddress); long countByUserName(String userName); boolean existsByUserName(String userName); List<SysProxyLog> findByRequestAddrLikeAndRequestBodyLike(String requestAddr, String requestBody); List<CardInfoCandidate> findFirst50000By(Sort sort); ~~~ ![](https://img.kancloud.cn/05/34/0534b9f12c3c69c1ba7397b995ee60b8_904x459.png) 具體可以參考:https://docs.spring.io/spring-data/jdbc/docs/2.2.0/reference/html/#repositories.query-methods.details ## 三、非查詢操作 根據方法名來自動生成SQL不僅支持普通查詢,也支持刪除、統計查詢等; 分別對應了find/get/read/query/search/stream、delete、count等; ~~~ Long deleteById(Long id); Long removeById(Long id); ~~~
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