如何在Azure Table Storage查询中测试字段是否存在

Question

I'm facing an interesting question, I had to run a datamigration script yesterday in order to add a field to entries in a Azure table. The script crashed just next to the end of its execution, and I have now 50 of my entries which need to be added this field (namely "OrganizationName").

I'd like to select only these entries, but running this query in Cloud Storage Studio does not return anything:

(OrganizationName eq '')

In C# I have the same result (empty list):

var query = from user in _tableService.GetDataContext().AppUserEntity
                    where 1 == 1 && user.OrganizationName == ""
                    select user;

List<AppUserEntity> list = query.ToList();

I suppose that makes sense, as my entities don't have the field, its value cannot be String.empty. But I'm wondering of an efficient way to retrieve these entries other than just retrieving everything and looping, and found nothing satisfying anywhere.

Any ideas?

(PS: I'm running SDK 1.8, which also might be part of the problem)

Answer 1

可能会在“时间戳记”上进行查询，以获取脚本崩溃时被跳过的行进行更新。