in reply to Help with uni project: DBI errors in CGI script

You call execute() on the $sth, not the $dbh. Same with finish(). You call prepare() and disconnect() on the $dbh, as you correctly are doing.

Being right, does not endow the right to be rude; politeness costs nothing.
Being unknowing, is not the same as being stupid.
Expressing a contrary opinion, whether to the individual or the group, is more often a sign of deeper thought than of cantankerous belligerence.
Do not mistake your goals as the only goals; your opinion as the only opinion; your confidence as correctness. Saying you know better is not the same as explaining you know better.

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