You can also generate the unpack string from the header itself if you know that the position of the keys in the header defines the columns in the rest of the file:

#!/usr/bin/perl

use strict;
use warnings;

my $header = <DATA>;
my @p;
push @p, length $1 while $header =~ /(\S+\s*)/g;
my $unpack_pattern = join "", map { 'A'.$_ } @p[0..$#p-1];
$unpack_pattern .= "A*";

while (<DATA>){
  chomp;
  my @vals = unpack($unpack_pattern,$_);
  print join "|", @vals,"\n";
  #$sth->execute(@vals);
}

__DATA__
StudentId Name      Dept address                 city
1         Chellappa CSE  22 xx-colony 2nd street coimbatore
2         Vijay     IT   23 yy colony            coimbatore
[download]

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.