[Spring] CRUD Repositories - Query Method 종류들 ★

 

 

 

 

 

 

Method Name으로 데이터베이스 쿼리 만들기

Query	Sample	Description
findById	List<User> findById(ID id)	id에 해당하는 user를 가져옴
findFirstBy	User findFirstByOrderByLastnameAsc()	Lastname column을 오름차순으로 정렬한 목록 중 첫번째 값을 찾음
findTop3By	List<User> findTop3ByLastname(String lastname, Sort sort)	Lastname순으로 정렬한 목록의 top 3 값을 찾음
findAll	List<User> findAll() List<User> findAllByOrderByLastname()	모든데이터를 가져옴 모든 데이터를 가져와서 Lastname순으로 정렬함 (OrderBy를 사용하려면 findAll뒤에 By를 붙여줘야함)
count	Long countByLastname(String lastname)	Lastname의 개수를 가져옴
delete	@Transactional void delete(User user)	해당 user를 삭제함
deleteById	@Transactional void deleteById(ID id)	해당 id를 가진 user를 삭제함
deleteAll	@Transactional void deleteAll()	모든 데이터를 삭제함
save	User save(User user)	해당 entity를 업데이트하고 저장함
saveAll	List<User> saveAll(List<User> users)	모든 entities를 업데이트하고 저장함
existsById	boolean existsById(ID id)	해당 id를 가진 데이터가 있으면 true, 없으면 false를 return함

 

 

 

 

 

Method Name에 지원되는 keywords

Keyword	Sample	JPQL snippet
And	findByLastnameAndFirstname	... where x.lastname = ?1 and x.firstname =?2
Or	findByLastnameOrFirstname	… where x.lastname = ?1 or x.firstname = ?2
Is,Equals	findByFirstname,findByFirstnameIs,findByFirstnameEquals	… where x.firstname = 1?
Between	findByStartDateBetween	… where x.startDate between 1? and ?2
LessThan	findByAgeLessThan	… where x.age < ?1
LessThanEqual	findByAgeLessThanEqual	… where x.age <= ?1
GreaterThan	findByAgeGreaterThan	… where x.age > ?1
GreaterThanEqual	findByAgeGreaterThanEqual	… where x.age >= ?1
After	findByStartDateAfter	… where x.startDate > ?1
Before	findByStartDateBefore	… where x.startDate < ?1
IsNull	findByAgeIsNull	… where x.age is null
IsNotNull,NotNull	findByAge(Is)NotNull	… where x.age not null
Like	findByFirstnameLike	… where x.firstname like ?1
NotLike	findByFirstnameNotLike	… where x.firstname not like ?1
StartingWith	findByFirstnameStartingWith	… where x.firstname like ?1 (parameter bound with appended %)
EndingWith	findByFirstnameEndingWith	… where x.firstname like ?1 (parameter bound with prepended %)
Containing	findByFirstnameContaining	… where x.firstname like ?1 (parameter bound wrapped in %)
OrderBy	findByAgeOrderByLastnameDesc	… where x.age = ?1 order by x.lastname desc
Not	findByLastnameNot	… where x.lastname <> ?1
In	findByAgeIn(Collection<Age> ages)	… where x.age in ?1
NotIn	findByAgeNotIn(Collection<Age> age)	… where x.age not in ?1
True	findByActiveTrue()	… where x.active = true
False	findByActiveFalse()	… where x.active = false
IgnoreCase	findByFirstnameIgnoreCase	… where UPPER(x.firstame) = UPPER(?1)