355 lines
10 KiB
Plaintext
355 lines
10 KiB
Plaintext
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#!/usr/bin/env perl
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#===============================================================================
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#
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# FILE: remodel_db_host_eps
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#
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# USAGE: ./remodel_db_host_eps
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#
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# DESCRIPTION: Remodel the 'hosts' and 'eps' tables in the HPR database so
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# that a many-to-many relationship between host and episode can
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# be established.
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#
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# OPTIONS: ---
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# REQUIREMENTS: ---
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# BUGS: ---
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# NOTES: ---
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# AUTHOR: Dave Morriss (djm), Dave.Morriss@gmail.com
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# VERSION: 0.0.2
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# CREATED: 2014-05-08 10:55:28
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# REVISION: 2015-06-26 13:33:20
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#
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#===============================================================================
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use 5.010;
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use strict;
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use warnings;
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use utf8;
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use YAML::Syck;
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use List::Util qw{max};
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use List::MoreUtils qw{uniq};
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use DBI;
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#use Data::Dumper;
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#
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# Version number (manually incremented)
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#
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our $VERSION = '0.0.2';
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#
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# Script name
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#
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( my $PROG = $0 ) =~ s|.*/||mx;
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( my $DIR = $0 ) =~ s|/?[^/]*$||mx;
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$DIR = '.' unless $DIR;
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#-------------------------------------------------------------------------------
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# Declarations
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#-------------------------------------------------------------------------------
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#
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# Constants and other declarations
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#
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my $basedir = "$ENV{HOME}/HPR/Database";
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my $configfile = "$basedir/.hpr_db.yml";
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my ( $dbh, $sth1, $sth2, $sth3, $sth4, $h1, $h2, $rv );
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my ( %hosts_by_name, %hosts_by_id, %eps, @names, $hostid, $hid, $max_hostid );
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#
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# Names of fields in the 'hosts' table in the appropriate order for the later
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# INSERT statement
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#
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my @host_flds = qw{
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hostid
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host
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email
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profile
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license
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local_image
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valid
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};
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#
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# Names of fields in the 'eps' table in the appropriate order for the later
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# INSERT statement. Note that it omits the 'hostid' field.
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#
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my @eps_flds = qw{
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id
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date
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title
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summary
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notes
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series
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explicit
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license
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tags
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version
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valid
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};
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#
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# Enable Unicode output mode
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#
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binmode STDOUT, ":encoding(UTF-8)";
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binmode STDERR, ":encoding(UTF-8)";
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#
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# Load configuration data
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#
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my %config = %{ LoadFile($configfile) };
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#-------------------------------------------------------------------------------
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# Connect to the database
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#-------------------------------------------------------------------------------
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my $dbname = $config{database}->{name};
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my $dbuser = $config{database}->{user};
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my $dbpwd = $config{database}->{password};
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$dbh
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= DBI->connect( "dbi:mysql:dbname=$dbname", $dbuser, $dbpwd,
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{ AutoCommit => 1 } )
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or die $DBI::errstr;
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#
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# Enable client-side UTF8
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#
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$dbh->{mysql_enable_utf8} = 1;
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#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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# The expectation is that we have the following original tables:
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# hosts - the details of each host (contains some double entries
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# "hostA and hostB")
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# eps - the details of all episodes, currently with a host id number
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# against each one
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#
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# We also have the following new tables for the transition:
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# new_hosts - an empty copy of the 'hosts' table, InnoDB
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# new_eps - an empty copy of the 'eps' table without the 'hostid'
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# column, InnoDB
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# hosts_eps - a mapping table for joining together the 'new_hosts' and
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# 'new_eps' tables, InnoDB with foreign keys
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#
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# See the file 'hosts_eps.sql' for the DDL which creates these tables.
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#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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#-------------------------------------------------------------------------------
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# Collect the entire 'hosts' table
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#-------------------------------------------------------------------------------
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$sth1 = $dbh->prepare(q{SELECT * FROM hosts ORDER BY hostid DESC});
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$sth1->execute;
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if ( $dbh->err ) {
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die $dbh->errstr;
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}
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#
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# Grab the data as an arrayref of hashrefs
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#
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my $hosts = $sth1->fetchall_arrayref( {} );
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#
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# Make hashes keyed on the host name and on the id
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#
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%hosts_by_name = map { $_->{host} => $_ } @{$hosts};
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%hosts_by_id = map { $_->{hostid} => $_ } @{$hosts};
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$max_hostid = max( map { $_->{hostid} } values(%hosts_by_name) );
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#-------------------------------------------------------------------------------
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# Collect the entire 'eps' table
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#-------------------------------------------------------------------------------
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$sth1 = $dbh->prepare(q{SELECT * FROM eps ORDER BY id DESC});
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$sth1->execute;
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if ( $dbh->err ) {
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die $dbh->errstr;
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}
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#
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# Grab the data as an arrayref of hashrefs
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#
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my $eps = $sth1->fetchall_arrayref( {} );
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#
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# Make a hash keyed on the episode number
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#
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%eps = map { $_->{id} => $_ } @{$eps};
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#-------------------------------------------------------------------------------
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# Walk the hash of hosts by name, finding double host entries. Stash the
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# episode numbers against the hosts (but do it messily resulting in duplicates
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# as a side effect)
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#-------------------------------------------------------------------------------
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foreach my $key ( keys(%hosts_by_name) ) {
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$hostid = $hosts_by_name{$key}->{hostid};
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#
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# Is this a double ("HostA and HostB") entry?
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#
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if ( @names = ( $key =~ /^([[:print:]]+) and ([[:print:]]+)$/ ) ) {
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printf "%3d: %s\n", $hosts_by_name{$key}->{hostid}, $key;
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#
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# Process the names picked out of the 'host' field
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#
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foreach my $name (@names) {
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if ( exists( $hosts_by_name{$name} ) ) {
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#
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# Known name, report it
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#
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printf "\t%3d: %s\n", $hosts_by_name{$name}->{hostid}, $name;
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printf "Replace %d with %d\n",
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$hosts_by_name{$key}->{hostid},
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$hosts_by_name{$name}->{hostid};
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#
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# Collect all episodes relating to the double id ($hostid) and
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# add them to the known id ($hid)
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#
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$hid = $hosts_by_name{$name}->{hostid};
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$hosts_by_id{$hid}->{eps}
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= collect_eps( $hostid, \%eps,
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$hosts_by_id{$hid}->{eps} );
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#
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# Mark the double id as not valid
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#
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$hosts_by_id{$hostid}->{valid} = 0;
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}
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else {
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#
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# Unknown name, make a new host entry
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#
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print "\t'$name' not known\n";
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$max_hostid++;
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$hosts_by_id{$max_hostid} = {
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'profile' => '',
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'local_image' => '0',
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'hostid' => $max_hostid,
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'license' => 'CC-BY-SA',
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'host' => $name,
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'valid' => '1',
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'email' => ''
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};
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#
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# Save all episodes for this name
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#
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$hid = $hosts_by_name{$key}->{hostid};
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$hosts_by_id{$max_hostid}->{eps}
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= collect_eps( $hid, \%eps,
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$hosts_by_id{$max_hostid}->{eps} );
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}
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}
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}
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else {
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#
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# Single host, just collect all their episodes
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#
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$hosts_by_id{$hostid}->{eps}
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= collect_eps( $hostid, \%eps, $hosts_by_id{$hostid}->{eps} );
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}
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}
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#-------------------------------------------------------------------------------
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# Report on the structure we built, de-duplicating as we go
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#-------------------------------------------------------------------------------
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foreach my $hid ( sort { $a <=> $b } keys(%hosts_by_id) ) {
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if ( exists( $hosts_by_id{$hid}->{eps} ) ) {
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#
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# De-duplicate the episode list
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#
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@{ $hosts_by_id{$hid}->{eps} }
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= sort { $a <=> $b } uniq( @{ $hosts_by_id{$hid}->{eps} } );
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#
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# Print the host details followed by the episodes
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#
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printf "Hostid: %d [%s,%d] (%d)\n", $hid,
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$hosts_by_id{$hid}->{host},
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$hosts_by_id{$hid}->{hostid},
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scalar( @{ $hosts_by_id{$hid}->{eps} } );
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foreach my $ep ( @{ $hosts_by_id{$hid}->{eps} } ) {
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printf " Episode: %d\n", $ep;
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}
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}
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}
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#-------------------------------------------------------------------------------
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# Turn the %hosts_by_id hash into database insert statements
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#-------------------------------------------------------------------------------
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my $sql1 = sprintf( "INSERT INTO new_hosts VALUES(%s)",
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join( ",", map { '?' } @host_flds ) );
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$sth1 = $dbh->prepare($sql1);
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my $sql2 = sprintf( "INSERT INTO new_eps VALUES(%s)",
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join( ",", map { '?' } @eps_flds ) );
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$sth2 = $dbh->prepare($sql2);
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$sth3 = $dbh->prepare(q{INSERT INTO hosts_eps VALUES(?,?)});
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#
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# The 'new_hosts' table
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#
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foreach my $hid ( sort { $a <=> $b } keys(%hosts_by_id) ) {
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$sth1->execute( @{ $hosts_by_id{$hid} }{@host_flds} );
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if ( $dbh->err ) {
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die $dbh->errstr;
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}
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}
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#
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# The 'new_eps' table
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#
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foreach my $eid ( sort { $a <=> $b } keys(%eps) ) {
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$sth2->execute( @{ $eps{$eid} }{@eps_flds} );
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if ( $dbh->err ) {
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die $dbh->errstr;
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}
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}
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#
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# The 'hosts_eps' table
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#
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foreach my $hid ( sort { $a <=> $b } keys(%hosts_by_id) ) {
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if ( exists( $hosts_by_id{$hid}->{eps} ) ) {
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foreach my $ep ( @{ $hosts_by_id{$hid}->{eps} } ) {
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$sth3->execute( $hosts_by_id{$hid}->{hostid}, $ep );
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if ( $dbh->err ) {
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die $dbh->errstr;
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}
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}
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}
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}
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exit;
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#=== FUNCTION ================================================================
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# NAME: collect_eps
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# PURPOSE: Collect all the episodes relating to a hostid and return them,
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# along with the contents of $current as an array of hashrefs
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# PARAMETERS: $hostid the host id we're interested in
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# $eps hashref containing anonymous hashes keyed by
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# episode number
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# $current a reference to any existing array of episodes
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# for this host id
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# RETURNS: A reference to the resulting array of anonymous hashes
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# DESCRIPTION:
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# THROWS: No exceptions
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# COMMENTS: None
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# SEE ALSO: N/A
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#===============================================================================
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sub collect_eps {
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my ( $hostid, $eps, $current ) = @_;
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my @host_eps;
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@host_eps = @{$current} if $current;
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foreach my $epsid ( keys(%$eps) ) {
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if ( $eps->{$epsid}->{hostid} == $hostid ) {
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push( @host_eps, $epsid );
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}
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}
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return \@host_eps;
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}
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# vim: syntax=perl:ts=8:sw=4:et:ai:tw=78:fo=tcrqn21:fdm=marker
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