DynamoDB的UUID？ [英] UUIDs for DynamoDB?

问题描述

在向表中添加新项目时，是否有可能使DynamoDB自动生成唯一ID？

Is it possible to get DynamoDB to automatically generate unique IDs when adding new items to a table?

我注意到Java API提到了@DynamoDBAutoGeneratedKey，所以我假设

I noticed the Java API mentions @DynamoDBAutoGeneratedKey so I'm assuming there's a way to get this working with PHP as well.

如果是这样，应用程序代码会生成这些ID还是在DynamoDB上完成？

If so, does the application code generate these IDs or is it done on the DynamoDB side?

推荐答案

很好的问题-虽然从概念上讲是可能的，但目前看来这不是DynamoDB API级别的功能，因此在CreateTable 或 PutItem 是指此类功能。

Good question - while conceptually possible, this seems not currently available as a DynamoDB API level feature, insofar neither CreateTable nor PutItem refer to such a functionality.

您注意到的 @DynamoDBAutoGeneratedKey 表示法是 Java注释，即Java提供的语法糖SDK确实是：

The @DynamoDBAutoGeneratedKey notation you have noticed is a Java annotation, i.e. syntactic sugar offered by the Java SDK indeed:

在Java计算机编程语言中，注释是一种特殊的
形式的语法元数据，可以添加

An annotation, in the Java computer programming language, is a special form of syntactic metadata that can be added to Java source code.

因此 @DynamoDBAutoGeneratedKey 是 Amazon DynamoDB注释作为Java SDK的高级API中 Object Persistence Model 的一部分提供（请参见在Amazon DynamoDB中使用对象持久性模型）：

As such @DynamoDBAutoGeneratedKey is one of the Amazon DynamoDB Annotations offered as part of the Object Persistence Model within the Java SDK's high-level API (see Using the Object Persistence Model with Amazon DynamoDB):

标记哈希键或范围键属性为自动生成。保存这些
属性时，
对象持久性模型将生成一个随机UUID。只能将String属性标记为自动生成的
键。

Marks a hash key or range key property as being auto-generated. The Object Persistence Model will generate a random UUID when saving these attributes. Only String properties can be marked as auto-generated keys.

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