c# - DynamoDB .NET - 从表中删除所有项目

Question

我正在学习如何使用 DynamoDB for .net，我有一个疑问，是否有从现有表中删除所有项目的正确方法？我的意思是，我不想删除表，只是清空它。 我读过有关批处理的信息，但它们对我帮助不大。

我有这个

private string DeleteAllFromTable()
    {
        string result = string.Empty;

        try
        {

            var request = new BatchWriteItemRequest
            {
                RequestItems = new Dictionary<string, List<WriteRequest>> 
                { 
                    {
                        this.Tablename, new List<WriteRequest>
                        {
                            new WriteRequest
                            {
                                DeleteRequest = new DeleteRequest
                                {
                                    Key = new Dictionary<string,AttributeValue>()
                                    {
                                        { "Id", new AttributeValue { S = "a" } }
                                    }
                                }
                            }
                        }
                    }
                }
            };

            var response = this.DynamoDBClient.BatchWriteItem(request);

        }
        catch (AmazonDynamoDBException e)
        {

        }


        return result;
    }

当然，那只会删除与值“a”匹配的 id。

谢谢。

Answer 1

我建议您只删除表并重新创建它。来自 DynamoDB Guidelines for Working with Tables documentation :

...

Deleting an entire table is significantly more efficient than removing items one-by-one, which essentially doubles the write throughput as you do as many delete operations as put operations.