in reply to DBI confusion

What I do in my scripts is setting the RaiseError option to 1, and let it take care of all errors.

Then you can do something along these lines: 

my $sth = $dbh->prepare("SELECT password FROM table WHERE userName = ?
+");
$sth->execute($username);
if ($sth->selectrow_array){
    print "logged in\n";
}

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Please don't ever interpolate data into your SQL queries, use placeholders like I did in the example above. If you interpolate data, you're not safe against SQL injection - what if the user name actually is evil ' or '' = '?

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Re^2: DBI confusion
by choroba (Cardinal) on Jun 01, 2017 at 08:45 UTC
    selectrow_array is a method of the database handle, the method of the statement handle is called fetchrow_array. See DBI. 
    ($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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