Question

我已经构建了一个将Log4Net日志写入名为LogTable的SimpleDB表/域的appender。我现在正在尝试编写一个Windows服务，它将删除此表中的旧记录。绝对正在创建AmazonSimpleDB客户端，手动运行时的查询会返回记录。但是，当通过单元测试执行代码时，不会返回任何结果。表格和列名称区分大小写是正确的。

using (AmazonSimpleDB simpleDbClient = AWSClientFactory.CreateAmazonSimpleDBClient(accessKey, secretKey))
                {
                    String selectExpression = String.Format("select * from LogTable where Timestamp < '{0:o}'", purgeDate);
                    SelectRequest selectRequestAction = new SelectRequest().WithSelectExpression(selectExpression);
                    SelectResponse selectResponse = simpleDbClient.Select(selectRequestAction);

                    if (selectResponse.IsSetSelectResult())
                    {
                        BatchDeleteAttributesRequest deleteRequest = new BatchDeleteAttributesRequest().WithDomainName("LogTable");
                        deleteRequest.Item = new List<DeleteableItem>();

                        SelectResult selectResult = selectResponse.SelectResult;
                        foreach (Item item in selectResult.Item)
                        {
                            deleteRequest.Item.Add(new DeleteableItem { ItemName = item.Name });
                        }

                        if (deleteRequest.Item.Count > 0)
                        {
                            simpleDbClient.BatchDeleteAttributes(deleteRequest);
                        }

                        logger.InfoFormat("Success - {0} log records deleted from LogTable", deleteRequest.Item.Count);
                    }
}

真的很感激这方面的一些帮助。

Answer 1

只会返回满足表达式的记录，因此请确保您的查询正确无误。简单的选择查询返回什么？试试这个并检查 -

select * from LogTable

如果您没有获得任何点击，请指定区域终点。

如果它返回，请确保您指定的条件匹配。

已编辑：

请尝试运行此代码，并使用您的域所属的link指定区域终点。

AmazonSimpleDBConfig theConfig = new AmazonSimpleDBConfig();
theConfig.ServiceURL = myEndpoint;  //where myEndPoint is the region endpoint you are interested in
AmazonSimpleDBClient simpleDbClient= new AmazonSimpleDBClient(myKey, mySecretKey, theConfig);
String selectExpression = "select * from LogTable";
SelectRequest selectRequestAction = new SelectRequest();
selectRequestAction.SelectExpression = selectExpression;
selectRequestAction.NextToken = null;
SelectResponse selectResponse = simpleDbClient.Select(selectRequestAction);
SelectResult selectResult = selectResponse.SelectResult;
List<Item> itemList = selectResult.Item;

Amazon SimpleDB查询通过c＃不返回任何记录

1 个答案: