I currently use PHP4 and mySQL to great lengths at my current job. I have built an interface to allow users to add/modify and delete records from a databse.
What I would like to know is where one can go to read up on tutorials on data checking. I need to have a query go out, look at the data on the database, compare it to what the user is trying to enter in, and kick back an error if the data on the db already exists.
I know that might sound really basic to some of you out there, but I seem to be struggling with it.
What I would like to know is where one can go to read up on tutorials on data checking. I need to have a query go out, look at the data on the database, compare it to what the user is trying to enter in, and kick back an error if the data on the db already exists.
I know that might sound really basic to some of you out there, but I seem to be struggling with it.