SpringDemo/src/main/java/com/example/springdemo/service/MerchantsService.java

package com.example.springdemo.service;

import com.example.springdemo.entities.Merchants;

import java.util.List;
import java.util.Optional;

public interface MerchantsService {
    Merchants insetMerchants(Merchants merchant);

    void deleteMerchantsById(Long id);

    Merchants updateMerchants(Merchants merchant);

    List<Merchants> findAllMerchants();

    Optional<Merchants> findById(Long id);

    Merchants findByName(String name);
}