I am using Perl and MySQL to create a customer catalog. What I would like to do is create a change log, so when I update the primary table I have a record of it.

I have created my tables as such:

CREATE TABLE catalog (
  phone_number VARCHAR(10) PRIMARY KEY NOT NULL,
  name         VARCHAR(255),
  address      VARCHAR(255),
  notes        VARCHAR(255)
);

CREATE TABLE change_log (
  transaction_id INT(10) PRIMARY KEY NOT NULL AUTO INCREMENT,
  timestamp TIMESTAMP,
  number_record VARCHAR(255),
  action        VARCHAR(255)
);
[download]

So I update the DB pragmatically like so:

#!/usr/bin/perl

use strict;
use warnings;

use DBI;
use DBD::mysql;

#this is my config module
use DBase::MySQL::Config qw(DB_CUSTOMER_CATALOG DB_USER DB_PW);

my $dbh = DBI->connect(DB_CUSTOMER_CATALOG, DB_USER, DB_PW);

my $query = "INSERT INTO catalog (phone_number) VALUES ('5555555555'),
+ ('1111111111');";
$dbh->do($query);

$dbh->disconnect();
[download]

What I would like to do is: if a record exists, update the record with name, address, etc. and insert a new record into the change log, with number affected and action performed. If a record doesn't exist, insert the new record into the customer catalog (along with name, address, and any notes where applicable) and add a new record to the change log noting the addition.

Thanks in advance for any assistance. This one has had me stuck.

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