spring data jpa : jpa hint & lock

spring-data-jpa/src/main/java/com/example/springdatajpa/repository/MemberRepository.java

@@ -5,12 +5,11 @@ import com.example.springdatajpa.entity.Member;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.domain.Slice;
-import org.springframework.data.jpa.repository.EntityGraph;
-import org.springframework.data.jpa.repository.JpaRepository;
-import org.springframework.data.jpa.repository.Modifying;
-import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.jpa.repository.*;
 import org.springframework.data.repository.query.Param;
 
+import javax.persistence.LockModeType;
+import javax.persistence.QueryHint;
 import java.util.Collection;
 import java.util.List;
 import java.util.Optional;
@@ -63,4 +62,10 @@ public interface MemberRepository extends JpaRepository<Member, Long> {
 //    @EntityGraph(attributePaths = {"team"})
     @EntityGraph("Member.all")
     List<Member> findEntityGraphByUsername(@Param("username") String username);
+
+    @QueryHints(value = @QueryHint(name = "org.hibernate.readOnly", value = "true"))
+    Member findReadOnlyByUsername(String username);
+
+    @Lock(LockModeType.PESSIMISTIC_WRITE)
+    Member findLockByUsername(String username);
 }

spring-data-jpa/src/test/java/com/example/springdatajpa/repository/MemberRepositoryTest.java

@@ -279,5 +279,32 @@ public class MemberRepositoryTest {
             System.out.println("member.getTeam().getName() = " + member.getTeam().getName()); // fetch join
         });
     }
+
+    @Test
+    void queryHint() {
+        // given
+        Member member1 = new Member("member1", 10);
+        memberRepository.save(member1);
+        em.flush();
+        em.clear();
+
+        // when
+        Member findMember = memberRepository.findReadOnlyByUsername("member1");
+        findMember.setUsername("member2");// read only 옵션으로 변경 감지 X
+        em.flush();
+    }
+
+    @Test
+    void lock() {
+        // given
+        Member member1 = new Member("member1", 10);
+        memberRepository.save(member1);
+        em.flush();
+        em.clear();
+
+        // when
+        Member findMember = memberRepository.findLockByUsername("member1");
+
+    }
 }