dao

src/main/java/com/webproglabs/lab1/lab34/repository/CategoryRepository.java

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+package com.webproglabs.lab1.lab34.repository;
+
+import com.webproglabs.lab1.lab34.model.Category;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface CategoryRepository extends JpaRepository<Category, Long> {
+    Optional<Category> findById(Long Id);
+}

src/main/java/com/webproglabs/lab1/lab34/repository/ProductRepository.java

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+package com.webproglabs.lab1.lab34.repository;
+import com.webproglabs.lab1.lab34.model.Product;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface ProductRepository extends JpaRepository<Product, Long> {
+    Optional<Product> findById(Long Id);
+}

src/main/java/com/webproglabs/lab1/lab34/repository/ShopRepository.java

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+package com.webproglabs.lab1.lab34.repository;
+import com.webproglabs.lab1.lab34.model.Shop;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface ShopRepository extends JpaRepository<Shop, Long> {
+    Optional<Shop> findById(Long Id);
+}

src/main/java/com/webproglabs/lab1/lab34/repository/UserRepository.java

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+package com.webproglabs.lab1.lab34.repository;
+import com.webproglabs.lab1.lab34.model.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface UserRepository extends JpaRepository<User, Long> {
+    Optional<User> findById(Long Id);
+    Optional<User> findOneByLoginIgnoreCase(String Login);
+}