iamjhkang
asked on
when OO-designing...
I'm new to OO- design.
I've had some Relational experience.
I'm confused.
For example, when I design classes which one is the better?
when CUSTOMERS ORDER PRODUCTS...
I have three classes called, CUSTOMER,ORDER,PRODUCT.
CUSTOMER have three attributes, customer_ID, customer_name, customer_address.
PRODUCT have three attributes, product_ID, Product_name, Product_price
First option of ORDER is
class ORDER {
string order_code;
string product_id;
string customer_id;
}
The other is as follows.
class ORDER {
string order_code;
Product _product;
Customer _customer;
}
In relational database design, when you design n:n relationship of two entities the relational entity comes around like,
when customer orders products customer,
cardinality n:n
so
intermediate table(order) comes out.
so we can use the PK of two tables(product,customer) as FK of the ORDER table.
Are there criteria like above in OOAD?
Thanks.
I've had some Relational experience.
I'm confused.
For example, when I design classes which one is the better?
when CUSTOMERS ORDER PRODUCTS...
I have three classes called, CUSTOMER,ORDER,PRODUCT.
CUSTOMER have three attributes, customer_ID, customer_name, customer_address.
PRODUCT have three attributes, product_ID, Product_name, Product_price
First option of ORDER is
class ORDER {
string order_code;
string product_id;
string customer_id;
}
The other is as follows.
class ORDER {
string order_code;
Product _product;
Customer _customer;
}
In relational database design, when you design n:n relationship of two entities the relational entity comes around like,
when customer orders products customer,
cardinality n:n
so
intermediate table(order) comes out.
so we can use the PK of two tables(product,customer) as FK of the ORDER table.
Are there criteria like above in OOAD?
Thanks.
Well.. ya only need to learn Associattion and bit about Composition or say containment theory n you will be able to solve your problem.. i couldn't suggesti ne thing.. cuz this is the basic problem when one comes from a relational background to OOP .. its better to learn about what i mentioned above.. n you would be having a fair idea of such Entity Relations.. in OOD.. by they way these are kinda basics so ya must go through to these topics
ASKER
Yes. It's basics.
I know relationships between classes, association and composition.
You know basics, I want experts's comments on the basics.
I know relationships between classes, association and composition.
You know basics, I want experts's comments on the basics.
ASKER CERTIFIED SOLUTION
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ASKER
Great.
Thanks.
Thanks.