springboot之数据库操作（1）

springboot之数据库操作1——（spring data jpa）

                																			——"我靠"

刚学习了springboot的数据库操作，我的脑子里就两个字——“我靠”。
这操作，相对于其他java框架来说简直是太简单了，比起jfinal数据库操作，我感觉都不差,更不要说mybatis了。

jpa是什么？

步骤

1.添加相关jar包/依赖

        org.springframework.boot
        spring-boot-starter-data-jpa
    
     
        mysql
        mysql-connector-java
    

2.添加配置文件

spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

spring.jpa.properties.hibernate.hbm2ddl.auto=update
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql= true

3.添加实体类和Dao

实体类：用来和数据库的表进行关联。

@Entity
public class User implements Serializable {

	private static final long serialVersionUID = 1L;
	@Id
	@GeneratedValue
	private Long id;
	@Column(nullable = false, unique = true)
	private String userName;
	@Column(nullable = false)
	private String passWord;
	@Column(nullable = false, unique = true)
	private String email;
	@Column(nullable = true, unique = true)
	private String nickName;
	@Column(nullable = false)
	private String regTime;

	//省略getter settet方法、构造方法

}

Dao：一个面向对象的数据库接口，用来调用操作数据库的方法的。

public interface UserRepository extends JpaRepository {
    User findByUserName(String userName);
    User findByUserNameOrEmail(String username, String email);
}

4.测试

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(Application.class)
public class UserRepositoryTests {

	@Autowired
	private UserRepository userRepository;

	@Test
	public void test() throws Exception {
		Date date = new Date();
		DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG);        
		String formattedDate = dateFormat.format(date);
		
		userRepository.save(new User("aa1", "[email protected]", "aa", "aa123456",formattedDate));
		userRepository.save(new User("bb2", "[email protected]", "bb", "bb123456",formattedDate));
		userRepository.save(new User("cc3", "[email protected]", "cc", "cc123456",formattedDate));

		Assert.assertEquals(9, userRepository.findAll().size());
		Assert.assertEquals("bb", userRepository.findByUserNameOrEmail("bb", "[email protected]").getNickName());
		userRepository.delete(userRepository.findByUserName("aa1"));
	}

}

具体：http://www.ityouknow.com/springboot/2016/02/03/spring-boot-web.html