Difference between container-managed & bean-managed persistence?

Difference between container-managed & bean-managed
persistence?

Question Posted / aparna

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Difference between container-managed & bean-managed persistence?..

Answer / janet

In container-managed persistence, entity bean data is
automatically maintained by the container using a mechanism
of its choosing. For example, a container implemented on top
of an RDBMS may manage persistence by storing each bean?s
data as a row in a table. Or, the container may use Java
programming language serialization for persistence. When a
bean chooses to have its persistence container managed, it
specifies which of its fields are to be retained.

In bean-managed persistence, the bean is entirely
responsible for storing and retrieving its instance data.
The EntityBean interface provides methods for the container
to notify an instance when it needs to store or retrieve its
data.

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Difference between container-managed & bean-managed persistence?..

Answer / john doe

In a CMP the task of mainitain the persitance is carried out
completely by the container. It is simpler for the developer
as the most of the tasks are handled by the contianer
itself. The developer does not have to worry about
connectivity or the JDBC

In a BMP the developer has to use database APIs to read or
write data into the DB. This gives him the flexibilty to
carry out the persistance operations which are too
complicated for the container to handle. He has to use EJB
QL (EJB Query Lanaguage) to interact with the database using BMP

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