SpringBoot 整合 Spring Data JPA 简单使用

• 快速入门
• • 引入依赖（pom.xml文件）
  • 配置数据源信息（application.yml）
  • 编写实体类user
  • 编写dao
  • 定义service接口
  • 继承server接口实现方法
  • 编写controller

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org.springframework.bootspring-boot-starter-data-jpa2.6.5

配置数据源信息（application.yml）

spring:
  datasource:
    username: userName
    password: password
    name: databaseName
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://192.168.253.129:3306/databaseName?serverTimezone=UTC&characterEncoding=UTF-8

编写实体类user

@Entity
@Data
@Table(name = "user")
public class SysUser {@Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    @Column
    private String username;
    @Column
    private String password;

编写dao

public interface SysUserDao extends JpaRepository, JpaSpecificationExecutor{SysUser findByUsername(String username);
}

定义service接口

public interface SysUserService {Listsearch();
    SysUser searchById(Integer id);
    SysUser searchByUsername(String username);
    boolean add(SysUser sysUser);
    boolean update(SysUser sysUser);
    boolean delete(Integer id);
}

继承server接口实现方法

@Service
public class SysUserServiceImpl implements SysUserService {@Autowired
    SysUserDao sysUserDao;

    @Override
    public Listsearch() {return sysUserDao.findAll();
    }

    @Override
    public SysUser searchById(Integer id) {return sysUserDao.findById(id).get();
    }

    @Override
    public SysUser searchByUsername(String username) {return sysUserDao.findByUsername(username);
    }

    @Override
    public boolean add(SysUser sysUser) {return sysUserDao.save(sysUser) != null;
    }

    @Override
    public boolean update(SysUser sysUser) {return sysUserDao.save(sysUser) != null;
    }

    @Override
    public boolean delete(Integer id) {try {sysUserDao.deleteById(id);
        } catch (Exception e) {return false;
        }
        return true;
    }
}

编写controller

@Controller
@RequestMapping("sysUser")
public class SysUserController {@Autowired
    SysUserService sysUserService;

    @Autowired
    SysRoleService sysRoleService;
	@RequestMapping("search")
	public ModelAndView search() {ModelAndView mv = new ModelAndView("sysUser/show");
		Listlist = sysUserService.search();
		mv.addObject("list", list);
		return mv;
	}
}

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