Spring Boot統合Spring Data JPAプロセス解析

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <scope>runtime</scope>
</dependency>

server.port=8080
server.servlet.context-path=/

# database configuration
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/blog?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=123

# jpa configuration
#             
spring.jpa.hibernate.ddl-auto=update
#      sql    
spring.jpa.show-sql=true
spring.jpa.open-in-view=false

# log configuration
logging.level.root=info

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.validation.constraints.NotBlank;

/**
 *   JPA         
 * Created by zxf on 2019 9 30 
 */
@Entity //   JPA       （        ）
@Table(name = "t_type") // @Table           ，                 
public class Type {
  @Id //         
  @GeneratedValue(strategy = GenerationType.IDENTITY) //     
  private Long id;

  @Column(name = "last_name", length = 50) //             ，           
  private String name;
}

import org.springframework.data.jpa.repository.JpaRepository;

/**
 * Created by zxf on 2019 10 1 
 */
//             Type，     Long  Type   id Long  
public interface TypeRepository extends JpaRepository<Type, Long> {
  //        
  Type findTypeByName(String name);
}

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

import javax.transaction.Transactional;

import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;

import com.fei.NotFoundException;
import com.fei.po.Type;
import com.fei.repository.TypeRepository;
import com.fei.service.TypeService;

/**
 * Created by zxf on 2019 10 1 
 */
@Service
@Transactional
public class TypeServiceImpl implements TypeService {

  @Autowired
  private TypeRepository typeRepository;

  /**
   *       
   * 
   * @param type
   * @return
   */
  @Override
  public Type saveType(Type type) {
    return typeRepository.save(type);
  }

  /**
   *   id        
   * 
   * @param id
   * @return
   */
  @Override
  public Type getType(Long id) {
    return typeRepository.findById(id).get();
  }

  /**
   *               
   * 
   * @param pageable
   * @return
   */
  @Override
  public Page<Type> listType(Pageable pageable) {
    return typeRepository.findAll(pageable);
  }

  /**
   *     
   * 
   * @param id
   * @param type
   * @return
   */
  @Override
  public Type updateType(Long id, Type type) {
    Type t = typeRepository.findById(id).get();

    if (t == null) {
      throw new NotFoundException("     ");
    }
    BeanUtils.copyProperties(type, t);

    return typeRepository.save(t);
  }

  /**
   *   id      
   * 
   * @param id
   */
  @Override
  public void deleteType(Long id) {
    typeRepository.deleteById(id);
  }

  /**
   *             
   * 
   * @param name
   * @return
   */
  @Override
  public Type getTypeByName(String name) {
    return typeRepository.findTypeByName(name);
  }

  /**
   *            
   * 
   * @return
   */
  @Override
  public List<Type> listType() {
    return typeRepository.findAll();
  }

}