I have strange problems inserting data in a MySQL (3.23.36) table. In a apparently casual way, my data are truncated. Here the code I'm using:

sub insert_msg
{
    my $author = $query->param('author');
    my $subject = $query->param('subject');
    my $body = $query->param('body');
    my $parent = $query->param('parent');

    my $thread;
    if ( $parent ) {
        my $sth = $dbh->prepare(qq|select id, thread from messaggi whe
+re id=?|);
        $sth->execute( $parent ) || die $DBI::errstr;
        my $hr = $sth->fetchrow_hashref();
        
        $thread = ($hr->{'thread'} == 0) ? $hr->{'id'} : $hr->{'thread
+'};
    }
    else {
        $thread = 0;
    }

    $body = validate( $body );
    
    $body = HTML::Entities::encode( $body );
    $body =~ s/\[(.*?)\|(.*?)\]/target($1, $2)/eg;
    $body =~ s/\[(.*?)\]/target($1)/eg;
    
    my $sth = $dbh->prepare( qq|insert into messaggi values(null, ?, n
+ull, ?, ?, ?, null)| );
    $sth->execute( $thread, $author, $subject, $body ) || die $DBI::er
+rstr;

    $template->process( $config->{'template'}->{'insert'} );
}

[download]

Here the table's description: 

CREATE TABLE `messaggi` (
  `id` int(10) unsigned NOT NULL auto_increment,
  `thread` int(10) unsigned default NULL,
  `data` timestamp(14) NOT NULL,
  `author` varchar(100) default NULL,
  `subject` varchar(200) default NULL,
  `body` text,
  `category` int(10) unsigned default NULL,
  PRIMARY KEY  (`id`),
  FULLTEXT KEY `body` (`body`),
) TYPE=MyISAM

[download]

As you can guess, it's a mysql-based webforum. Very simple.
First of all, I fetch information about the thread where the message has to be inserted. Then, I validate the $body using HTML::Parser, stripping HTML tags that are not valid. Then, I replace links with appropriate HTML, like in PerlMonks. Eventually, I insert the message in the database.

Sometime the $body is truncated, casually, apparently. For example, inserting the same message after some minute, the body is inserted correctly.

Thank you for every advice.

In reply to Truncated data using MySQL and DBI by larsen

Title:
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