只要实体是没有其他父母的父实体，上述代码就会工作。
如果您有一个子实体，您也必须迁移父键。

例如：

 键parentKey = key.getParent（）; 
 Key newParentKey = KeyFactory.createKey（parentKey.getKind（），parentKey.getId（））; 
 

只有您可以使用此代码

  Key newKey = KeyFactory.createKey（newParentKey，childKey.getKind（），childKey.getId（））; 
 

这个例子只适用于一个家长，如果你有多个家长，你将不得不使用这个代码几次。

I have started to migrate from our M/S application to HRD. I wonder if you can recommend me how to convert old string encoded keys to new ones.

I know that string encoded keys holds the application name, although I am not certain if there are other details which I need to take care of. In addition, I could not find any forum-post, which has Java's code example of converting "string encoded keys" which looks quite strange to me (only python forums discuss it).

I will appreciate any help on this matter.

By the way I thought to run the following, although I'm afraid it will not work or cover all aspects:

    private static String convertKey(String encodedKey) {
    Key key = KeyFactory.stringToKey(encodedKey);       
    Key newKey = KeyFactory.createKey(key.getKind(), key.getId());      
    return KeyFactory.keyToString(newKey);
}

Thanks! Uri

The above code will work as long as the Entity is a Parent entity with no other Parents. If you have a Child Entity you will have to migrate the parent key as well.

For Example:

Key parentKey = key.getParent(); 
Key newParentKey = KeyFactory.createKey(parentKey.getKind(), parentKey.getId());

Only then you can use this code

Key newKey = KeyFactory.createKey(newParentKey,childKey.getKind(), childKey.getId());      

This example applies for only one parent, if you have multiple parents you will have to use this code a few times.