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The entry point into the form will be a public method named ManagePayments. Add that code now to the PatronPayment class.
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INSERT SNIPPET Insert 19, Snippet Item 3.
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Public Sub ManagePayments(ByVal patronCopyID As Integer, _ ByVal sessionPayments As Generic.List(Of PaymentItem)) ' ----- Manage the payments for an item. ActivePatronCopyID = patronCopyID PaymentsOnly = sessionPayments Me.ShowDialog( ) End Sub
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This method records the patron-copy ID number and the collection of payments for that checked-out item. Processing then moves on to the form s Load event handler. It s in this routine that we will add our localized financial management code. In the PatronPayment_Load routine, scan down about one-third of the way through the method to the code that loads in the summary details from the database. Just after the line:
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RecordItem.Text = CStr(dbInfo!Title)
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add the statements that will globally format currency values for the Fines, Payments, and Balance summary labels that appear near the top of the form.
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originalFine = CDec(dbInfo!Fine) RecordFine.Text = Format(originalFine, "Currency") RecordPayments.Text = Format(CDec(dbInfo!Paid), "Currency") balanceDue = originalFine - CDec(dbInfo!Paid) RecordBalance.Text = Format(balanceDue, "Currency")
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The rest of the Load event handler s code loads existing records from the PatronPayment table, plus the original overdue fine, if any, from the PatronCopy.Fine database field. Later, when the user clicks the Add button to add a new financial event to the patron-and-item-copy entry, the SaveEventData routine equivalent to the SaveFormData method in most of the other forms we ve developed so far saves the updated information in the database. This routine needs to save the new charge or payment in the PatronPayment table, plus update the charge and payment summary in the PatronCopy record. Add the code that writes out these records, just after the calculations for the fineAmount and paidAmount variables in the SaveEventData method.
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19: Localization and Globalization
INSERT SNIPPET Insert 19, Snippet Item 5.
' ----- Add the entry to the database. TransactionBegin( ) sqlText = "INSERT INTO PatronPayment (PatronCopy, " & _ "EntryDate, EntryType, Amount, Comment, UserID) " & _ "OUTPUT INSERTED.ID VALUES (" & ActivePatronCopyID & _ ", GETDATE( ), " & DBText(entryCode) & ", " & _ RecordAmount.Text & ", " & _ DBText(Trim(RecordComment.Text)) & _ ", " & LoggedInUserID & ")" newID = CInt(ExecuteSQLReturn(sqlText)) sqlText = "UPDATE PatronCopy SET Fine = " & fineAmount & _ ", Paid = " & paidAmount & " WHERE ID = " & _ ActivePatronCopyID ExecuteSQL(sqlText) TransactionCommit( )
I ve wrapped up both database statements in a transaction to help ensure the integrity of the data. Once the database is up-to-date, it s time to update the screen. The on-screen list of charges and payments needs this new record. That list uses the local EventHistoryItem class, a variation of the application-wide ListItemData class that we usually use in ListBox controls. EventHistoryItem has fields that are specific to displaying financial information in the EventHistory listbox. Add the code that builds an EventHistoryItem record and add it to the EventHistory list, immediately after the database update code we just added.
INSERT SNIPPET Insert 19, Snippet Item 6.
' ----- Add an item to the entry list. historyItem = New EventHistoryItem historyItem.PaymentID = newID historyItem.EntryDate = Today historyItem.PaymentAmount = CDec(RecordAmount.Text) historyItem.Comments = Trim(RecordComment.Text) historyItem.EntryType = entryType EventHistory.Items.Add(historyItem)
This code block is followed by similar code that updates the PaymentsOnly list, the Generic.List(Of PaymentItem) that was passed in from the calling form. The code either updates the existing payment summary record, or adds a new record to the generic list.
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' ----- Add a new payment. scanPayment = New PaymentItem scanPayment.PatronCopyID = ActivePatronCopyID scanPayment.ItemTitle = RecordItem.Text scanPayment.FeesPaid = paidAmount scanPayment.BalanceDue = fineAmount - paidAmount PaymentsOnly.Add(scanPayment)
Before leaving this function, we need to refresh the three financial summary values near the top of the form, the ones we set when the form first loaded. Add this code just after the update to the PaymentOnly list.
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