What is an EJB primary key? How is it implemented when the database doesn have a primary key?
A primary key is an object that uniquely identifies the entity bean. According to the specification, the primary key must be unique for each entity bean within a container. Hence the bean’s primary key usually maps to the PK in the database (provided its persisted to a database). You may need to create a primary key in the database for the sake of referential integrity. This does not, however, mean you NEED a primary key in the database. As long as the bean’s primary key (which maps to a column or set of columns) can uniquely identify the bean it should work.
