content: /*
   * Copyright (c) 2020 Adam Gaj
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.adgadev.jplusone.test.domain.bookshop;
  
  import org.springframework.data.jpa.repository.JpaRepository;
  import org.springframework.data.jpa.repository.Query;
  import org.springframework.data.repository.query.Param;
  import org.springframework.stereotype.Repository;
  
  import java.util.Optional;
  
  @Repository
  public interface BookRepository extends JpaRepository<Book, Long> {
  
      @Query("SELECT b FROM Book b " +
              "LEFT JOIN FETCH b.author " +
              "WHERE b.id=:id")
      Optional<Book> findByIdAndFetchAuthor(@Param("id") Long id);
  }
  