Question

我使用DynamoDB和查询API用于所有ComparisonOperators，除了＆＃34; EQ＆＃34;它一直给我＆＃34;尝试的条件约束不是一个可转换的操作＆＃34;错误。

是什么原因？

{"TableName":"My_Table_name",
    "IndexName":"titleIndex",
    "Select":"ALL_ATTRIBUTES",
    "KeyConditions":
        {"title":
            {"AttributeValueList":[{"S":"title2"}],
            "ComparisonOperator":"NE"}
        }
}

Answer 1

For query operation, only the following comparison operators are supported:

EQ | LE | LT | GE | GT | BEGINS_WITH | BETWEEN

You can use NE for scan operation.

Refer: http://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Condition.html

Answer 2

这可能会有所帮助： DynamoDB query with Comparison Operators

您可以从中获取更多信息：

http://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Query.html 对于KeyConditions，仅支持以下比较运算符：

情商| LE | LT | GE | GT | BEGINS_WITH | BETWEEN

尝试条件约束不是可索引操作

2 个答案: