如果已为实体自动生成已删除的实体ID，那么App Engine再次可以使用吗? [英] Are deleted entity IDs once again available to App Engine if auto-generated for an Entity?

问题描述

有时候，我会在放置数据存储区实体之前分配一个ID，而有时我会允许App Engine自动生成ID.

Sometimes I allocate an ID before putting a datastore entity and other times I allow app engine to auto-generate the ID.

我的问题是:如果我放置一个实体然后将其删除，那么在分配和/或允许应用引擎为新实体自动生成ID时，该ID是否再次变为可用?

My question is: If I put an entity and then delete it, does the ID once again become available when allocating and/or allowing app engine to auto-generate an ID for a new entity?

我问的原因是我可能还有其他引用该ID的实体(有点像密钥)，因此即使删除实体后，我也不希望ID可以回收.我目前通过仅删除实体而不在实体上放置已删除"标志来解决此问题.想知道这是如何工作的.

The reason I ask is I may have other entities referencing that ID (kind of like a key), so I do not want the ID's to be recycled even after an entity is deleted. I currently solve this by just never deleting entities but putting a "deleted" flag on them. Wondering how this works though.

推荐答案

我不会依赖ID的不重复使用-没有明确记录.另请参阅(相反) Google App Engine(数据存储)-删除的密钥会重新生成吗?.

I wouldn't rely on the non-reuse of the IDs - it is not explicitly documented. See also (the opposite) Google App Engine (datastore) - will a deleted key regenerate?.

如果您对保留实体不满意，我建议在实际删除实体并开放以供潜在重用之前，实施一种清理所有孤立引用的逻辑.无论如何这都不是一件坏事-这些孤立的引用可能会引起您的悲伤.

If you're not happy with keeping the entities around I'd suggest implementing a logic for cleaning up all the orphan references before actually deleting the entities and opening up for potential re-use. It wouldn't be a bad thing anyways - those orphan references could potentially cause you grief.

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