Hi, I have 4 questions ....i have made it in a interactive way and
tried to explain in simple way.

do you have answer ?

what is "Key class"  in  Entity Bean of EJB ?

you might say, for each primary key/field  of a table, there should be
a class , and its a "Key class"

am i right ?

Q1 :

If so,  there are so many fields in a table apart from the primary
field.

why  we  dont  make  the classes for those ?  we only  make a class
for  Primary  filed ? why ?
is it because when we pull by keywe will get value ?
or any other reason also ?

Q2:
how this primary Key class is used in the Entiyty bean ?

Q3:
can we make 2  Key class  ?  can we use these 2 in the Entity Bean ?

Q4: i have a column say ALPHA  and has the values say  A,B,C etc in 3
rows respectively.

how do i make a Key class for such column type carrying these values ?

Regards