spring data jpa : Query By Example

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

@@ -9,25 +9,25 @@ import javax.persistence.criteria.Join;
 import javax.persistence.criteria.JoinType;
 
 public class MemberSpec {
-
     public static Specification<Member> teamName(final String teamName) {
         return (root, query, criteriaBuilder) -> {
-
             if (ObjectUtils.isEmpty(teamName)) {
                 return null;
             }
 
-            Join<Member, Team> t = root.join("team", JoinType.INNER);// 회원과 조인
+            Join<Member, Team> t = root.join("team", JoinType.INNER); //회원과 조인
             return criteriaBuilder.equal(t.get("name"), teamName);
         };
     }
-
     public static Specification<Member> username(final String username) {
         return (root, query, criteriaBuilder) -> {
             if (ObjectUtils.isEmpty(username)) {
                 return null;
             }
-            return criteriaBuilder.equal(root.get("name"), username);
+
+            return criteriaBuilder.equal(root.get("username"), username);
         };
     }
 }
+
+

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

@@ -13,7 +13,7 @@ import static org.junit.jupiter.api.Assertions.*;
 
 @SpringBootTest
 @Transactional
-@Rollback(value = false) // 롤백 false
+//@Rollback(value = false) // 롤백 false
 class MemberJpaRepositoryTest {
 
     @Autowired MemberJpaRepository memberJpaRepository;

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

@@ -7,10 +7,7 @@ import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.dao.IncorrectResultSizeDataAccessException;
-import org.springframework.data.domain.Page;
-import org.springframework.data.domain.PageRequest;
-import org.springframework.data.domain.Slice;
-import org.springframework.data.domain.Sort;
+import org.springframework.data.domain.*;
 import org.springframework.data.jpa.domain.Specification;
 import org.springframework.test.annotation.Rollback;
 import org.springframework.transaction.annotation.Transactional;
@@ -25,7 +22,7 @@ import static org.junit.jupiter.api.Assertions.*;
 
 @SpringBootTest
 @Transactional
-@Rollback(value = false)
+//@Rollback(value = false)
 public class MemberRepositoryTest {
 
     @Autowired
@@ -314,7 +311,7 @@ public class MemberRepositoryTest {
     }
 
     @Test
-    void specBasic() {
+    void specBasic() throws Exception{
         // given
         Team teamA = new Team("teamA");
         em.persist(teamA);
@@ -333,5 +330,33 @@ public class MemberRepositoryTest {
 
         assertEquals(1, result.size());
     }
+
+    @Test
+    void queryByExample() {
+        // given
+        Team teamA = new Team("teamA");
+        em.persist(teamA);
+
+        Member member1 = new Member("member1", 0, teamA);
+        Member member2 = new Member("member2", 0, teamA);
+        em.persist(member1);
+        em.persist(member2);
+
+        em.flush();
+        em.clear();
+
+        // when
+        Member member = new Member("member1");
+        Team team = new Team("teamA");
+        member.setTeam(team);
+
+        ExampleMatcher matcher = ExampleMatcher.matching()
+                .withIgnorePaths("age");
+        Example<Member> example = Example.of(member, matcher);
+
+        List<Member> result = memberRepository.findAll(example);
+
+        assertEquals("member1", result.get(0).getUsername());
+    }
 }