关于Google App Engine实体删除

Question

i want to delete all of the entity. i found that if i want to delete a entity,

// Key employeeKey = ...;
datastore.delete(employeeKey);

Upper code can delete a one entity. but i want to delete all of the entities. is there any good way to delete at once? only can delete every entity each?

Answer 1

The delete method can take an argument of Iterable<Key> , so do something like

List<Key> keys = Arrays.asList(key1, key2, key3);
datastore.delete(keys);

https://developers.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/DatastoreService#delete%28java.lang.Iterable%29