如何使用 Morphia 将对象集合保存到 MongoDB？

Question

I am currently iterating over a collection of objects and saving them one by one. I suppose there is a way to save the entire collection directly?

Note, I would need to be able to retrieve each individual objects later (not the whole collection).

Answer 1

From the javadoc of the DataStore class. The might not be available on older versions. Even this I think is internally iterating and saving one at a time - but it might get optimized, so it is better to use this than iterate yourself.

<T> Iterable<Key<T>>
save(Iterable<T> entities) 
          Saves the entities (Objects) and updates the @Id field
<T> Iterable<Key<T>>
save(Iterable<T> entities, com.mongodb.WriteConcern wc) 
          Saves the entities (Objects) and updates the @Id field, with the WriteConcern
<T> Iterable<Key<T>>
save(T... entities) 
          Saves the entities (Objects) and updates the @Id field

http://morphia.googlecode.com/svn/site/morphia/apidocs/com/google/code/morphia/Datastore.html#save(java.lang.Iterable )