Hi all
1. What is a good example of 'dependant object'? The spec gives an
example of employee record. It says an employee record should be
modelled as entity beans, but employee address and phone number
should not be.
* What if all employee addresses are maintained in a different
table in the db?
* And phone number of course will be a field in my EB. Why should I
ever model it as a dependant object?
I think, dependant objects are only useful when used with SBs. With
EB, I am not sure where it will be useful. Because, with CMP bean,
all fields that will be stored in db should be declared public. I can
not, for example, have :
public MyClass myObject;
where, MyClass is a dependant object
class MyClass { public int x; public int y }
and in my deployment descriptor,
<cmp-field>
<field-name>myObject.x</field-name>
</cmp-field>
<cmp-field>
<field-name>myObject.y</field-name>
</cmp-field>
At least WebLogic 5.1 did not provide this feature.
In one case, my entity bean represented a table which had 20 columns.
Instead of taking all 20 params in ejbCreate() method, I had a helper
class which encapsulated these columns :
class Columns implements java.io.Serializable {
}
// MyHome.java
public MyRemote create(Columns cols) throws ...
Because of the stupid restriction that all persistable data members
should be declared in the bean class, I end up duplicated all data
members of 'class Columns' in my bean's class, like :
// MyBean.java
public Columns cols;
public MyPK ejbCreate(Columns cols) throws ... {
this.m = cols.m;
this.n = cols.n;
this.o = cols.o;
this.p = cols.p;
this.x = cols.x;
this.y = cols.y;
this.z = cols.z;
}
instead of simply doing,
public MyPK ejbCreate(Columns cols) throws ... {
if (cols != null) this.cols = cols
}
2. I was never successfully able to model a EB which refers to another
EB like,
// CompanyBean.java
class CompanyBean {
public int id; // PK
public int name;
}
// UserBean.java
class UserBean {
public int id; // PK
public String name;
public Company company;
}
I had to always use 'public int companyID' and rely on the
constraints provided by the underlying db.
BTW, I was always using WebLogic 5.1. I would like to know how other
containers solve this problem.
TIA.
--
shiv
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