我可以将AllocateIDs用作“字符串”吗？ 数据存储

Question

I need to assign a unique identifier to each entity in datastore. I've found AllocateIDs but the issue is that it generates integers and I use strings for the keys. Is it safe to convert the integer to a string or there is a risk of collision (i.e. datastore to return me the same integer that I'm currently using as a string key). ?

Answer 1

You can avoid any possibility of a collision by prefixing an id with any string that you know you never use for your keys. For example:

String key = "id" + entity.getKey().getId();

And all of this is necessary only if you ever use a sequence of integers for your string keys.