Spring Data JPA本机查询返回1个实体，而不是一个List

Question

我有查询（总是返回List有1 SysAutoId ）

@Query(value = "SELECT * FROM SYSAutoID WHERE RefTypeCategory = ?1 AND BranchID = ?2 ", nativeQuery = true)
List<SysAutoId> findSpecific(Integer refTypeCategory, Integer branchId);

我想创建一个像

@Query(value = "SELECT * FROM SYSAutoID WHERE RefTypeCategory = ?1 AND BranchID = ?2 ", nativeQuery = true)
SysAutoId findSpecific(Integer refTypeCategory, Integer branchId);

返回一个实体，该怎么做？

Answer 1

返回类型应该是Entity的Optional ，因为它仅返回第一个匹配的记录，请查看findById方法的语法

Optional<T> findById(ID primaryKey)

码

@Query(value = "SELECT * FROM SYSAutoID WHERE RefTypeCategory = ?1 AND BranchID = ?2 ", nativeQuery = true)
Optional<SysAutoId> findSpecific(Integer refTypeCategory, Integer branchId);