如何利用Spring Data实现DynamoDB表的哈希查询

// 1. 添加依赖
// pom.xml
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-dynamodb</artifactId>
</dependency>

// 2. 配置连接
// application.properties
spring.data.dynamodb.access-key=your-access-key
spring.data.dynamodb.secret-key=your-secret-key
spring.data.dynamodb.region=your-region

// 3. 创建实体类
// User.java
@DynamoDBTable(tableName = "users")
public class User {
    @DynamoDBHashKey
    private String id;
    @DynamoDBAttribute
    private String name;
    // 其他属性和getter/setter方法
}

// 4. 创建Repository接口
// UserRepository.java
@Repository
public interface UserRepository extends CrudRepository<User, String> {
    @Query("SELECT * FROM users WHERE id = :id")
    Optional<User> findById(@Param("id") String id);
}

// 5. 实现查询方法

// 6. 调用查询方法
@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;

    public User getUserById(String id) {
        Optional<User> user = userRepository.findById(id);
        return user.orElse(null);
    }
}