CGI/Perl Guide | Learning Center | Forums | Advertise | Login
Site Search: in

  Main Index MAIN
Search Posts SEARCH
Who's Online WHO'S
Log in LOG

Home: Perl Programming Help: DBI:
INSERT fails, but die is not executed


New User

Sep 17, 2009, 2:48 PM

Post #1 of 3 (7589 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

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:

<link rel="stylesheet" type="text/css" href="styles.css" />
<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">

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>
description <br />
<input type="text" name="description" size="57"/><br />
priority <br />
<input type="text" name="priority" size="1"/><br />

min_minutes <br />
<input type="text" name="min_minutes" size="2" /><br />
max_minutes <br />
<input type="text" name="max_minutes" size="2" /><br />
doors_open_time <br />
<input type="text" name="doors_open_time" size="5"/><br />
doors_close_time <br />
<input type="text" name="doors_close_time" size="5"/><br />
do_at_exactly_time <br />
<input type="text" name="do_at_exactly_time" size="5"/><br />
<input type="submit" value="Submit" />



And here is the perl script that is processing it:

# 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>

# 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>";


Sep 18, 2009, 9:09 AM

Post #2 of 3 (7580 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.



New User

Sep 18, 2009, 10:01 AM

Post #3 of 3 (7574 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

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

So now instead of saying

or die "jibberish";

I just say

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..


Search for (options) Powered by Gossamer Forum v.1.2.0

Web Applications & Managed Hosting Powered by Gossamer Threads
Visit our Mailing List Archives