In this demonstration, we will create a SysOperation service that detects members with overdue rentals. These members will get the blocked status by setting a checkbox on the member in the database.

The dialog for the service will look like the following screenshot:

As you can see, a query enables you to select the members for which the rentals should be checked. By enabling the checkbox, you can override the number of overdue days that are allowed before a member is blocked.

The SysOperation framework uses services to execute business logic; you have already learned most of the skills needed in Chapter 4, Custom Services.