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25. Performing a process on several successive pages
In a business site, orders can be placed on several pages: - page 1: Select products to order.
- page 2: View basket.
- page 3: Validate the order and enter the customer details.
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| | Page 1: Products |
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| Page 2: Basket | Page 3: Customer details |
In this case, the write-to-file operation must ONLY be performed in the code of the button that will validate the order: all elements must be stored until the order is validated. Don't write to the data files being processed Remark: You also have the ability to use a transaction but we recommend that you store the order details.
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