Download Pro Hibernate and MongoDB by Anghel Leonard PDF

By Anghel Leonard

Hibernate and MongoDB are a strong mixture of open resource endurance and NoSQL applied sciences for state-of-the-art Java-based company and cloud software builders. Hibernate is the best open resource Java-based endurance, item relational administration engine, lately repositioned as an item grid administration engine. MongoDB is a transforming into, well known open resource NoSQL framework, particularly renowned between cloud software and massive facts builders. With those , firm and cloud builders have a "complete out of the field" answer.

Pro Hibernate and MongoDB indicates you the way to take advantage of and combine Hibernate and MongoDB. extra in particular, this publication publications you thru the bootstrap; development transactions; dealing with queries and question entities; and mappings. Then, this ebook explores the foundations and methods for taking those program rules to the cloud, utilizing the OpenShift Platform as a provider (PaaS) and extra.

during this ebook, you get case reports:

  • An firm program utilizing Hibernate and MongoDB. then,
  • A cloud program (OpenShip) migrated from the firm software case learn

After interpreting or utilizing this publication, you come back away with the adventure from case reports that provide you with attainable frameworks or templates that you should observe on your personal particular software or cloud program construction context.

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31 Chapter 2 ■ Hibernate OGM and MongoDB In the unidirectional case, only the collection representing the owner side will contain navigation information for the association. ogm. store configuration property to the value IN_ENTITY. Actually, this is the default value of this property. GLOBAL_COLLECTION When you don’t want to store the navigation information for associations into an entity’s collections, you can choose the GLOBAL_COLLECTION strategy (or COLLECTION, as you’ll see in the next section).

In this case, Hibernate OGM creates an extra collection named Associations, especially designed to store all navigation information. The documents of this collection have a particular structure composed of two parts. The first part contains a composite identifier, _id, made up of two fields whose values represent the primary key of the association owner and the name of the association table; the second part contains a field, named rows, which stores foreign keys in an embedded collection. For bidirectional associations, another document is created where the ids are reversed.

And you won’t feel any programmatic discomfort, since Hibernate OGM doesn’t require you write any underlying MongoDB code. That’s the greatest! Storing Primary Keys A MongoDB document or collection has a very flexible structure. It supports simple objects: the embedding of objects and arrays within other objects and arrays; different kinds of documents in the same collection; and more, but it also contains a document field especially reserved for storing primary keys. This field is named _id and its value can be any information as long as it’s unique.

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