How to show error page in browser when Column cant be null

Hello everyone,
I've got a Record Insertion Form, and some of the fields are
set as "NOT NULL". When I miss out a few fields, the browser shows
the text - Column 'propertytype' cannot be null, which is fine, as
it cannot be null. But how do I redirect this to a user friendly
page which basically says, "sorry you havent written in all the
fields, please go back". How do I do this in dreamweaver?
Thank You

You need to validate all user input prior to executing any
sql statement. That will do it. There are also techniques to trap
error messages, which vary depending on the scripting language you
are using.

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How to show error page in browser when Column cant be null

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