Sales

Sample App for purchase orders while being online or offline. Ideal for serving point-of-sales (POS) purposes.

Feature	Objects	Comments
Offline Database object	Offline Database object SalesOfflineOfflineDatabase (Properties and Conditions)	Configure how the device is going to synchronize data with the central server, and write Conditions to filter the data that is going to be stored in the device.
Automatic Offline Data Synchronization	Offline Database object SalesOfflineOfflineDatabase (Properties)	The app synchronizes data with the central server automatically.
Offline Database Object events	Offline Database object PurchaseOrdersOfflineOfflineDatabase (Events tab)	Use the Offline Database object events in order to set variables to use them in the Conditions tab. This is useful for synchronizing specific data for each device.
Synchronization by Timestamp	All transaction have 2 extra attributes Timestamp and IsDeleted	Use this 2 attributes to know how to make the sychronization, which rows to update or delete.

Note:

The following link may help you if you don't know the steps to test a feature or built the application to see it in action: HowTo: Take advantage of a KB referenced in this wiki
This sample can also be downloaded via GeneXus Start Page just clicking on it.
This sample, as it is, does not work if you change Connectivity Support property to Online. (Errors like "Could not load" or "Data provider not found" may occur). To convert to Online you may use WebSession data type instead of ClientStorage external object, for example.