Spring Data JPA本機查詢返回1個實體，而不是一個List

Question

我有查詢（總是返回List有1 SysAutoId ）

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

我想創建一個像

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

返回一個實體，該怎么做？

Answer 1

返回類型應該是Entity的Optional ，因為它僅返回第一個匹配的記錄，請查看findById方法的語法

Optional<T> findById(ID primaryKey)

碼

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