Primary Key in Entity Beans
Yogender Butola
Greenhorn
Posts: 12
David Harkness
Ranch Hand
Posts: 1646
posted 12 years ago
No, every entity bean must have a primary key. It is used by the container to locate the rows to be modified/deleted and to enforce identity. Note that it is not required to have a primary key defined for the underlying table, though that seems silly.
It is quite common to use a surrogate key -- a non-data system-generated single-column (non-hyphenated
) value. It is assigned to each new entity upon creation -- either by the container or your code -- and never changed. This isolates object identity and foreign keys from data changes.
It is quite common to use a surrogate key -- a non-data system-generated single-column (non-hyphenated
) value. It is assigned to each new entity upon creation -- either by the container or your code -- and never changed. This isolates object identity and foreign keys from data changes.