Question

我已经实现了语义记录，将条目记录到azure表存储中。现在我想从azure表中删除旧的日志条目（比如说超过30天）。问题是azure表中的partitionKeys和RowKeys是动态生成的。像这样的东西

PartitionKey         RowKey

2519569987199999999  MyProjectName_2519569788418593594_FFFFFFF8 //entry date 20 october 2015
2519573205599999999  MyProjectName_2519573006928838932_FFFFFFE1 // entry date 16 october 2015

我研究并发现PartitionKey的格式为DateTime.MaxValue.Ticks - DateTime.UtcNow.Ticks

如何从表中获取数据以进行删除？我需要进行全表扫描，因为partitionKey是动态的吗？

Answer 1

如何从表中获取数据以进行删除？我需要做一个吗？由于partitionKey是动态的全表扫描？

不，您不需要进行全表扫描。以下是如何找出30天之前创建的实体。

        var today = DateTime.UtcNow.Date;
        var thirtyDaysFromToday = today.AddDays(-30);
        var pk = (DateTime.MaxValue.Ticks - thirtyDaysFromToday.Ticks).ToString();
        var account = new CloudStorageAccount(new StorageCredentials(accountName, accountKey), true);
        var tableClient = account.CreateCloudTableClient();
        var table = tableClient.GetTableReference("YourTableName");
        TableQuery query = new TableQuery().Where("PartitionKey ge '" + pk + "'").Select(new List<string>(){"PartitionKey", "RowKey"});//Since you only need PartitionKey/RowKey for entities deletion thus just fetch that only
        TableContinuationToken token = null;
        do
        {
            var queryResult = table.ExecuteQuerySegmented(query, token);
            token = queryResult.ContinuationToken;
            var entities = queryResult.Results;
            //Now you can delete those entities
        }
        while (token != null);

注意：我没有测试过代码，所以请先尝试使用较小的数据集，然后再全力以赴：）

删除由语义记录

1 个答案: