值太小时, dynamodb也会报错, 这里特殊处理下小值.

KvSetsFromItem 将item里面包含的字段填充到sets里面, item必须是一个结构体, key使用item里面的dynamodbav.

Start reading right after the position denoted by a specific sequence number.

Start reading exactly from the position denoted by a specific sequence number.

Start reading just after the most recent stream record in the shard, so that you always read the most recent data in the shard.

Start reading at the last (untrimmed) stream record, which is the oldest record in the shard.

Conditions 表示写入和更新需要判断的前置条件, 条件表达式介绍参考: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.ConditionExpressions.html https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.OperatorsAndFunctions.html.

下面是跟streams有关的.

Dynamo 封装aws dynamodb的sdk, 一个表对应一个对象, 使用者可并发调用.

Streams 封装aws dynamodbstreams的sdk, 一个表对应一个对象, 使用者可并发调用.