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INSERT fails, but die is not executed

jackdesert
New User

Sep 17, 2009, 2:48 PM

Post #1 of 3 (6196 views)

INSERT fails, but die is not executed	Can't Post

Hi, I'm new to this forum. Getting started with perl and DBI. I have a script that works when I put reasonable data into it, but when I put in values that mysql knows are invalid (doens't satisfy the uniqueness quality I specified for the `priority` field, for example), then the INSERT doesn't happen at all. Fine. No big deal. I didn't do any error checking. However, the puzzling part is this: the

Code

die "SQL Error: $DBI::errstr\n";

command never prints in my browser window. As a matter of fact, nothing further gets printed to the browser window. That makes it a bit tricky to debug..

Is there something I need to do to get the die() function to work?

By the way, I am running XAMPP for Linux on Ubuntu 9. Mozilla Firefox 3.0.

Here is the form that the user submits:

Code

<html> 
<head> 
	<link rel="stylesheet" type="text/css" href="styles.css" /> 
</head> 
<body> 
<h1>Add a task to your day! </h1> 
<center>Note that you can leave some fields blank.</center><br />  
<form action="/cgi-bin/add_to_database.cgi" method="post"> 
	<table> 
		<tr> 
 
 
 
			<td> 
				Groove <br /> 
				<select name="groove"> 
					<option value="A-Energy">A-Energy</option> 
					<option value="B-Energy">B-Energy</option> 
					<option value="R-ejuvenate">R-ejuvenate</option> 
				</select> 
			</td> 
			<td> 
				description <br /> 
				<input type="text" name="description" size="57"/><br /> 
			</td> 
			<td> 
				priority <br /> 
				<input type="text" name="priority" size="1"/><br /> 
			</td> 
			 
		</tr> 
	</table> 
	<table> 
		<tr> 
			<td> 
				min_minutes <br /> 
				<input type="text" name="min_minutes" size="2" /><br /> 
			</td> 
			<td> 
				max_minutes <br /> 
				<input type="text" name="max_minutes" size="2" /><br /> 
			</td> 
			<td> 
				doors_open_time <br /> 
				<input type="text" name="doors_open_time" size="5"/><br /> 
			</td> 
			<td> 
				doors_close_time <br /> 
				<input type="text" name="doors_close_time" size="5"/><br /> 
			</td> 
			<td> 
				do_at_exactly_time <br /> 
				<input type="text" name="do_at_exactly_time" size="5"/><br /> 
			</td> 
			<td> 
  				<input type="submit" value="Submit" /> 
			</td> 
		 
		</tr> 
	</table> 
</form> 
		 
 
 
</body> 
</html>

And here is the perl script that is processing it:

Code

#!/opt/lampp/bin/perl 
# was #!/usr/bin/perl 
 
use CGI; 
 
# Create the CGI object 
my $query = new CGI; 
 
# Output the HTTP header 
print $query->header ( ); 
# Print the body just in case we need it 
print "<html> 
<head></head> 
<body>"; 
 
# Capture the form results 
my $category = $query->param("groove"); 
my $description = $query->param("description"); 
my $priority = $query->param("priority"); 
my $min_minutes = $query->param("min_minutes"); 
my $max_minutes = $query->param("max_minutes"); 
my $doors_open_time = $query->param("doors_open_time"); 
my $doors_close_time = $query->param("doors_close_time"); 
my $do_at_exactly_time = $query->param("do_at_exactly_time"); 
 
 
 
use DBI; 
 
my $dbh = DBI->connect('dbi:mysql:honor_thyself','root','') 
or die "Connection Error: $DBI::errstr\n"; 
 
my $sql = "INSERT INTO `honor_thyself`.`tasks` (`category`, `priority`, `min_minutes`, `max_minutes`, `doors_open_time`, `doors_close_time`, `do_at_exactly_time`, `description`) VALUES ('$category', '$priority', '$min_minutes', '$max_minutes', '$doors_open_time', '$doors_close_time','$do_at_exactly_time', '$description');"; 
 
#print "sql is $sql <br /><br />"; 
 
 
my $sth = $dbh->prepare($sql); 
 
print"sql successfully prepared <br /><br />"; 
 
my $result = $sth->execute 
or die "SQL Error: $DBI::errstr\n"; 
 
 
 
my $sql2 = "SELECT * from tasks"; 
my $sth2 = $dbh->prepare($sql2) or die "SQL Error: $DBI::errstr\n"; 
my $result2 = $sth2->execute 
or die "SQL Error: $DBI::errstr\n"; 
 
print"<h2>Here are all your tasks to choose from</h2>"; 
while (my @row2 = $sth2->fetchrow_array) { 
print "@row2 <br /> <br />"; 
}  
 
 
# Thank the user 
 
print "Thanks for filling in our form!</body></html>";

1arryb
User

Sep 18, 2009, 9:09 AM

Post #2 of 3 (6187 views)

Re: [jackdesert] INSERT fails, but die is not executed [In reply to]	Can't Post

Hi jackdesert,

I don't do much CGI programming, but I know that messages printed to STDERR won't necessarily get back to your browser window. Try sending your error messages to a log file instead and see what you get.

Cheers,

Larry

jackdesert
New User

Sep 18, 2009, 10:01 AM

Post #3 of 3 (6181 views)

Re: [1arryb] INSERT fails, but die is not executed [In reply to]	Can't Post

Okay, I got a working error message by making my own function

Code

sub die_openly 
{ 
	my $message = shift; 
	print "<h2>$message</h2>\n"; 
	die; 
}

So now instead of saying

Code

or die "jibberish";

I just say

Code

or die_openly('jibberish');

and it spits out a big, beautiful error message. at some point I'll get fancy and want to redirect to another page, but this is enough for now. Thanks for the response..
-Jack

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