How can I insert common data into a temp table from disparate schemas?

Question

I am not sure how to solve this problem:

We import order information from a variety of online vendors ( Amazon, Newegg etc ). Each vendor has their own specific termino

Answer 1

Sounds like you need to create an abstract class that will define the basics of interacting with the data, then derive a class per database schema you need to access. This will allow the core code to operate on a single object type, and each implementation can then specify the queries in a form specific to that database schema.

Something like:

public class Order
{
    private String orderNumber;
    private BigDecimal orderTotal;
    ... etc ...
}

public abstract class AbstractOrderInformation
{
  public abstract ArrayList getOrders();
  ...
}

with a Newegg class:

public class NeweggOrderInformation extends AbstractOrderInformation
{
   public ArrayList getOrders() {
      ... do the work of getting the newegg order
   }
 ...
}

Then you can have an arbitrarily large number of formats and when you need information, you can just iterate over all the implementations and get the Orders from each.