TS/MP Pathsend and Server Programming Manual (H06.05+, J06.03+)

Identifying Transaction Components
After you have identified the Enter Sales transaction for the order-processing application, you list
the functions performed by the transaction and group them either into data collection and validation
operations or into database update operations. For example, the key functions performed by the
Enter Sales transaction during data collection and validation are:
• Assembling information for the order header, including:
Obtaining the order-ID◦
◦ Accepting the customer-ID
◦ Accepting the requested delivery date
◦ Accepting shipping instructions
◦ Checking the customer-ID
◦ Obtaining the customer’s name and address from the database
• Assembling the order, including:
Accepting the list of order items and the quantity of each item◦
◦ Checking the current quantity available for each item ordered
◦ Accepting special instructions
◦ Calculating total order cost
◦ Obtaining the customer’s balance and credit limit from the database
◦ Adding the total cost to the customer’s balance and ensuring that it does not exceed the
credit limit
The key function performed by the Enter Sales transaction during database update operations is
order completion. The order completion function includes:
• Subtracting the quantity ordered from the current quantity available for each ordered item
• Adding the total order cost to the customer’s current account balance
• Recording the order in the database
• Recording the order invoice in the accounts receivable files
• Recording order shipping information in the inventory files
The relationships of the various functions for the Enter Sales transaction are illustrated in Figure 5
(page 32). The dark arrows in the figure show the sequence of actions from Step 1 through Step
3. The lighter arrows show the flow of information.
Designing Transactions 31