QueryDSL 동적 쿼리

// build.gradle
dependencies {
    implementation "com.querydsl:querydsl-jpa:5.0.0:jakarta"
    annotationProcessor "com.querydsl:querydsl-apt:5.0.0:jakarta"
}

// UserRepositoryCustom 인터페이스
public interface UserRepositoryCustom {
    List<User> searchUsers(UserSearchCondition condition);
}

// UserRepositoryImpl 구현
@RequiredArgsConstructor
public class UserRepositoryImpl implements UserRepositoryCustom {
    private final JPAQueryFactory queryFactory;

    @Override
    public List<User> searchUsers(UserSearchCondition cond) {
        QUser user = QUser.user;
        BooleanBuilder builder = new BooleanBuilder();

        if (StringUtils.hasText(cond.getName())) {
            builder.and(user.name.contains(cond.getName()));
        }
        if (cond.getStatus() != null) {
            builder.and(user.status.eq(cond.getStatus()));
        }
        if (cond.getMinAge() != null) {
            builder.and(user.age.goe(cond.getMinAge()));
        }

        return queryFactory
            .selectFrom(user)
            .where(builder)
            .orderBy(user.createdAt.desc())
            .fetch();
    }
}