On Tuesday, May 28, 2002, 2:35:31 PM, Ranjan wrote:
PR> U can pass VO from
PR> the BO functions to the DAO. U are right that passing the values
PR> in the functions as u have done below is not the recommended
PR> practice. U can make ur VOs as updatable VOs which will accept
PR> data both ways from the client to the BO and from the DAO to the
PR> BO layer to update it with new values.
Is it normal/standard to pass stuff in a VO (or DTO) that
represents more than one object to the DAO ? In other words some
of the literature says to grab as much information you can in the
DTO/VO, such that you might get Employee information but also you
might be gathering other information (maybe unrelated to the
Employee object) also. So do you pass this whole Value Object over
to the DAO ? If so, what if you want to reuse this DAO and only
want to pass it a Value Object that only contains strictly
Employee information? It seems that if you want to do that then
you need to create another DAO ( or at least another method in the
DAO ).
I guess I'm confused since I thought the Value Object or DTO was
basically a similar representation of the Action Form object ( yet
obviously not tied to Struts ). If so in a sense it seems like if
you pass this Value Object to the DAO layer it seems like the DAO
will have to do too much work, and do work with an object which
later on might change. In other words back to the example of a
Value Object that captured both Employee Information from the form
and also captured information they filled out like a survey. If
this whole Value Object gets passed to the DAO, the DAO would then
be responsible for breaking it apart into inserting the Employee
and then also inserting the Survey. Shouldn't you maybe pass the
Value Object to a business component that would break this Value
Object into a couple smaller Value Objects and then pass those new
Value Objects (ie EmployeeVO, SurveyVO ) onto the appropriate
DAOs?
--
Rick
mailto:[EMAIL PROTECTED]
"I'd rather be rich than stupid"
-Jack Handey
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