Feat: WishlistRepository 인터페이스 구현

인터페이스 구현을 위해 기존 위시리스트 레포지토리 클래스를 삭제하고 위시리스트 인터페이스 파일로 재생성
findByMemberId 메서드는 인터페이스의 기본 메서드에 없는 기능이므로 추가로 메서드 작성

src/main/java/gift/repository/WishlistRepository.java

@@ -1,62 +1,13 @@
 package gift.repository;
-
 import gift.model.WishList;
-import org.springframework.jdbc.core.JdbcTemplate;
-import org.springframework.jdbc.core.simple.SimpleJdbcInsert;
+import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 
 @Repository
-public class WishlistRepository {
-    private final JdbcTemplate jdbcTemplate;
-    private final SimpleJdbcInsert simpleJdbcInsert;
-
-    public WishlistRepository(JdbcTemplate jdbcTemplate) {
-        this.jdbcTemplate = jdbcTemplate;
-        createWishlistTable();
-        this.simpleJdbcInsert = new SimpleJdbcInsert(jdbcTemplate)
-            .withTableName("wishlist_items")
-            .usingGeneratedKeyColumns("id");
-    }
-
-    public void createWishlistTable() {
-        String sql = "CREATE TABLE IF NOT EXISTS wishlist_items (" +
-            "id BIGINT AUTO_INCREMENT PRIMARY KEY," +
-            "member_id BIGINT NOT NULL," +
-            "product_id BIGINT NOT NULL," +
-            "product_name VARCHAR(255) NOT NULL," +
-            "product_price BIGINT NOT NULL" +
-            ")";
-        jdbcTemplate.execute(sql);
-    }
-
-    public WishList addProduct(WishList wishlist) {
-        Map<String, Object> parameters = new HashMap<>();
-        parameters.put("member_id", wishlist.getMemberId());
-        parameters.put("product_id", wishlist.getProductId());
-        parameters.put("product_name", wishlist.getName());
-        parameters.put("product_price", wishlist.getPrice());
-        Number newId = simpleJdbcInsert.executeAndReturnKey(parameters);
-        wishlist.setId(newId.longValue());
-        return wishlist;
-    }
-
-    public List<WishList> getProductsByMemberId(Long memberId) {
-        String sql = "SELECT * FROM wishlist_items WHERE member_id = ?";
-        return jdbcTemplate.query(sql, (rs, rowNum) -> {
-            Long id = rs.getLong("id");
-            Long productId = rs.getLong("product_id");
-            String name = rs.getString("product_name");
-            int price = rs.getInt("product_price");
-            return new WishList(id, memberId, productId, name, price);
-        }, memberId);
-    }
+public interface WishlistRepository extends JpaRepository<WishList, Long> {
+    List<WishList> findByMemberId(Long memberId);
 
-    public void deleteItem(Long id) {
-        String sql = "DELETE FROM wishlist_items WHERE id = ?";
-        jdbcTemplate.update(sql, id);
-    }
+    //void deleteById(Long productId);
 }