Data Access Object

[Madhu Juneja]

One of the SCEA obj :
Identify costs and benefits of using intermediate data-access object between entity bean and data resource.
Differences / Advantages / benefits :
1. JDBC DataSources can automatically pool and reused database connections for multiple clients.
2. DataSource objects can be stored in JNDI tree. If the Database type or location changes, we need to change only the single DataSource object stored in the JNDI tree.
But what are the disadvantages / costs associated with DAOs ? Can anyone elaborate on this. Thanks.

[Vivek Viswanathan]

hi
You can probally search for that stuff in the BluePrints, well I my self have to do that rit now.
Do you have any Idea on some good UML tool , other than Together Soft ( this question is does not belong to this topic but anyways....)
Vivek

[Madhu Juneja]

Refer : http://www.certificationguru.com/javaarchitectresources.html
for more links on cert and on UML