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29-Sep-2016 23:05

Practically no one uses Excel to update databases directly.

I think the reason is because we think of Excel as a tool that end users can do whatever they want to with and updating databases requires discipline.

If so, it allows it to be submitted to the server and (usually) saved in a database; if not, it gives you error messages to explain what you've done wrong (provided you've done it right).

form validation can be implemented in a number of different ways.

In suggesting that users are untrusted, we imply that everything else is trusted. Users are just the most obvious untrusted source of input since they are known strangers over which we have no control.

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We also want to help our users to fill out our forms correctly and don't get frustrated when trying to use our apps.Allowing invalid data to be entered into the database ensures that the database and the data available will become less valuable and harder for the user to use.Input Validation is the outer defensive perimeter for your web application.The truth is that none of us filling in forms — there is a lot of evidence to show that users get annoyed by forms, and are one of main things that will cause them to leave and go somewhere else if they are done badly. We want to make filling out web forms as non-horrible as possible, so why do we insist on blocking our users at every turn?

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There are three main reasons: In the real world, developers tend to use a combination of client-side and server-side validation, to be on the safe side.Just using Excel to shotgun records into a database can be disastrous because putting bad data into a database is often far worse than putting no data in at all.