Mobile Business Object States

• Original state, the state before any create, update, or delete operation.
• Downloaded state, the state downloaded from the Unwired Server.
• Current state, the state after any create, update, or delete operation.

The mobile business object class provides properties or methods for querying the original state and the downloaded state:

public sample.Customer GetOriginalState()
public Customer DownloadState;

The original state is valid only before the application synchronizes with the Unwired Server. After synchronization has completed successfully, the original state is cleared and set to null.

Customer cust = Customer.FindByPrimaryKey(101); // state 1
cust.Fname = "supAdmin";
cust.Company_name = "Sybase";
cust.Phone = "777-8888";
cust.Save(); // state 2
Customer org = cust.GetOriginalState(); // state 1
//suppose there is new download for Customer 101 here
Customer download = cust.DownloadState; // state 3
cust.CancelPending(); // state 3

Using all three states, the application can resolve most conflicts that may occur.