java - Dynamodb java 语法

Question

以下 dynamo 数据库查询语法有什么区别:
我们曾经使用过

QueryRequest queryRequest = new QueryRequest().withTableName(TABLE).withKeyConditions(keyConditions)....;

在最新的文档中我看到:

table.query("Id", replyId,
            null, ///RangeKeyCondition - not used in this example
            "PostedBy = :val", //FilterExpression

我们应该使用哪一个？这是一个新的语法吗？差异？
谢谢

Answer 1

不同的风格，相同的 DynamoDB API。 The new Document API was introduced in Oct 2014

.. the new Document API allows the direct use of plain old Java data types and has less boilerplate. In fact, the Dynamo Document API can be used to entirely subsume what you can do with the low level client (i.e. AmazonDynamoDBClient) but with a much cleaner programming model and less code.

我个人仍然使用AmazonDynamoDBClient (您的第一个代码示例)