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The context object is used to authorize access to particular actions.

Individual DSOs implement an update() method.  This method calls org.dspace.storage.rdbms.DatabaseManager.update().  This is a helper class that helps to construct the SQL for a DSO.

Data Access Objects (introduced in DSpace 6.x)

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In DSpace 6, Hibernate was implemented as the DAO.  The DAO concept would allow for a framework other than Hibernate to be implemented in the DSpace code base.

Here is the interface for the GenericDAO in DSpace 6: https://github.com/DSpace/DSpace/blob/master/dspace-api/src/main/java/org/dspace/core/GenericDAO.java

Hibernate (introduced in DSpace 6.x)

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Objects accessed by hibernate are registered in the hibernate.cfg.xml file.  DSO properties and relationships can be inferred from the database schema.  

The following class provides a hibernate implementation of the GenericDAO interface: https://github.com/DSpace/DSpace/blob/master/dspace-api/src/main/java/org/dspace/core/AbstractHibernateDAO.java

Because hibernate has a mechanism for automatically updating content that has changed, the save() method is not implemented.  See https://github.com/DSpace/DSpace/blob/dspace-6.1/dspace-api/src/main/java/org/dspace/core/AbstractHibernateDAO.java#L43-L45

Hibernate Annotations in DSpace

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