ProductDao.java

package com.querydsl.example.dao;

import com.querydsl.core.types.Predicate;
import com.querydsl.example.dto.Product;

import java.util.List;

public interface ProductDao {

    Product findById(long id);

    List<Product> findAll(Predicate... where);

    Product save(Product p);

    long count();

    void delete(Product p);

}