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Old 12-08-2003, 09:10 AM   #1
morbid_ru
LQ Newbie
 
Registered: Dec 2003
Posts: 6

Rep: Reputation: 0
Need to compare 2 databases. Help please!


Here is my problem.

I need to compare to text files. Data in the file is in this format:

Item number|Quantity

Example:

File 1:

40|1
35|2
36|1

or (40|1, 35|2, 36|1)

File 2:

35|1
42|2
36|0

or (35|1, 42|2, 36|0)

What I want to do is to comapre 2 databases based on the Item number.

Te result of this comparisson should be:

40|1
35|3
36|0
42|2

or (40|1, 35|3, 36|0, 42|2)

As you see, if File 2 contain the same item, quantities should be added, if quantity in file 2 = "0", it should change to "0" in File 1.
If item that is in File 2 is not present in File 1, it should be simply added to file 1. If item exist in File 1 and does not exist in File 2, it should remain in File 1.

Anyone who knows how to do this in Perl, please help me with the code for this!

Many thanks!
Alex
 
Old 12-08-2003, 05:16 PM   #2
ToniT
Senior Member
 
Registered: Oct 2003
Location: Zurich, Switzerland
Distribution: Debian/unstable
Posts: 1,357

Rep: Reputation: 47
Code:
#!/usr/bin/perl

my %foo;
while(<>) {
        m/([0-9]*)\|([0-9]*)/;
        $foo{"$1"} += $2;
}

foreach(keys(%foo)) {
 print "Hash is : $_:$foo{$_}\n";
}
 
  


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