如何将spring boot web应用连接到postgresql数据库

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

spring.datasource.url=jdbc:postgresql://localhost:5432/mydatabase
spring.datasource.username=postgres
spring.datasource.password=yourpassword
spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect

@Entity
@Table(name = "users")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    
    private String name;
    private String email;
    
    // 省略构造函数、getter和setter方法
}

@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    // 可以在这里定义自定义的查询方法
}

@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;
    
    public User saveUser(User user) {
        return userRepository.save(user);
    }
    
    // 其他数据库操作方法
}