findById 작성하기

Related to: #37

src/main/java/com/example/naverrestaurant/controller/ApiController.java

@@ -16,6 +16,11 @@ public class ApiController {
 
     private final WishListService wishListService;
 
+    @GetMapping("/findById")
+    public WishListDto findById(@RequestParam int index){
+        return wishListService.findById(index);
+    }
+
     @GetMapping("/search")
     public WishListDto search(@RequestParam String query){
         return wishListService.search(query);

src/main/java/com/example/naverrestaurant/db/H2DbRepositoryAbstract.java

@@ -0,0 +1,67 @@
+package com.example.naverrestaurant.db;
+
+import com.example.naverrestaurant.wishlist.entity.WishListEntity;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.core.RowMapper;
+
+import javax.sql.DataSource;
+import java.util.List;
+import java.util.Optional;
+
+
+
+abstract public class H2DbRepositoryAbstract<T extends MemoryDbEntity> implements MemoryDbRepositoryIfs<T>{
+    private JdbcTemplate jdbcTemplate;
+
+    @Autowired
+    public void setDataSource(DataSource dataSource){
+        this.jdbcTemplate = new JdbcTemplate(dataSource);
+    }
+
+    @Override
+    public Optional<T> findById(int index) {
+        String findByIdQuery = "select * from restaurant where index=? limit 1";
+        int findByIdParam = index;
+
+        WishListEntity wishListEntity = jdbcTemplate.queryForObject(findByIdQuery,
+                wishListEntityRowMapper(),
+                index);
+
+        return (Optional<T>) Optional.of(wishListEntity);
+    }
+
+    @Override
+    public T save(T entity) {
+        return null;
+    }
+
+    @Override
+    public void deleteById(int index) {
+
+    }
+
+    @Override
+    public List<T> listAll() {
+        return null;
+    }
+
+    private RowMapper<WishListEntity> wishListEntityRowMapper(){
+        return ((rs, rowNum) -> {
+            WishListEntity wishListEntity = new WishListEntity();
+            wishListEntity.setIndex(rs.getInt("index"));
+            wishListEntity.setTitle(rs.getString("title"));
+            wishListEntity.setCategory(rs.getString("category"));
+            wishListEntity.setAddress(rs.getString("address"));
+            wishListEntity.setRoadAddress(rs.getString("roadAddress"));
+            wishListEntity.setHomePageLink(rs.getString("homePageLink"));
+            wishListEntity.setImageLink(rs.getString("imageLink"));
+            wishListEntity.setVisit(rs.getBoolean("isVisit"));
+            wishListEntity.setVisitCount(rs.getInt("visitCount"));
+            wishListEntity.setLastVisitDate(rs.getTimestamp("lastVisitDate").toLocalDateTime());
+
+            return wishListEntity;
+        });
+    }
+
+}

src/main/java/com/example/naverrestaurant/wishlist/service/WishListService.java

@@ -10,6 +10,7 @@
 import org.springframework.stereotype.Service;
 
 import java.util.List;
+import java.util.Optional;
 import java.util.stream.Collectors;
 
 @Service
@@ -96,4 +97,12 @@ public List<WishListDto> findAll() {
     public void delete(int index) {
         wishListRepository.deleteById(index);
     }
+
+    public WishListDto findById(int index) {
+        Optional<WishListEntity> wishListEntity = wishListRepository.findById(index);
+        if(!wishListEntity.isPresent()){    // wishListEntity에 값이 없으면 Exception 처리하기
+            throw new IllegalArgumentException();
+        }
+        return entityToDto(wishListEntity.get());   // wishListEntity에 값이 있으면 wishListDto로 변환하여 리턴하기
+    }
 }