Complicated JOIN using multiple tables - mysql

Question

For example
I have several profile tables, such as
music_profile
sports_profile
art_profile
All of these tables have matching names, and they all have a title column.
A second table contains alternative titles per any given profile table's row.
Their columns are essentially:
id, parent_id, parent_table, alt_title_001, alt_title_002, alt_title_003, alt_title_004, status, created, updated.
I want to
SELECT multiple column values
FROM music_profile, sports_profile, art_profile
WHERE title, alt_title_001, alt_title_002, alt_title_003, alt_title_004 are like a value
I can currently select columns using WHERE title LIKE and UNION, but I have no idea how to combine the alternate_titles table in the SELECT statement.
I've provided my current code below. The table for alternate_titles has not been implemented here.
I don't necessarily want a coded solution to this issue; I would just like a hint to get me on my way.
sub AdvancedSearchFormResults {
my $self = shift;
my $opts = ref $_[0] eq 'HASH' ? shift : {#_};
my $mode = shift;
my $order = shift;
my $limit = shift;
my #array;
my $where;
my $mode = $$opts{mode};
my $left_join_clause;
my (#where_stmt, #where_vals, #join);
if (defined $$opts{platform}) {
$where = $$opts{platform};
}
if ($$opts{'title_like'}) {
push(#where_stmt, "title like ?");
push(#where_vals, '%'.$$opts{'title_like'}.'%');
}
if ($$opts{'publisher'}) {
push(#where_stmt, "publisher = ?");
push(#where_vals, $$opts{'publisher'});
}
if ($$opts{'status'}) {
push(#where_stmt, "status = ?");
push(#where_vals, $$opts{'status'});
}
my $left_join_clause = scalar #join ? join("\n", #join) : "";
my $where_clause = #where_stmt ? "WHERE ".join(" AND ", #where_stmt) : "";
my $order_clause = length($order) ? "ORDER BY $order" : "";
my $limit_clause = length($limit) ? "LIMIT $limit" : "";
my $select_stmt;
if ($mode eq 'BUILD') {
$select_stmt = "SELECT
'$where' AS event,
ident,
title,
publisher
FROM $where
$left_join_clause
$where_clause
$order_clause
$limit_clause";
my $sth = $schema->prepare($select_stmt) or die $schema->errstr;
$sth->execute(#where_vals) or die $sth->errstr;
while (my $row = $sth->fetchrow_hashref()) {
push(#array, $row);
}
}
elsif ($mode eq 'UNION') {
my #select_stmts;
my #platforms = $self->ProfileTables();
my $total_platforms = -1;
foreach my $table (#platforms) {
$total_platforms++;
my $stmt = "(SELECT '$table' AS event,ident,title,publisher,status FROM $table $where_clause)";
push(#select_stmts, $stmt);
}
my $select_stmt .= "$select_stmts[0] UNION ALL";
$select_stmt .= join(' UNION ALL ', #select_stmts[ 1 .. 28 ]);
my #new_vals = (#where_vals, (#where_vals) x $total_platforms);
my $sth = $schema->prepare($select_stmt) or die $schema->errstr;
$sth->execute(#new_vals) or die $sth->errstr;
while (my $row = $sth->fetchrow_hashref()) {
push(#array, $row);
}
}
elsif ($mode eq 'REFRESH') {
print '
<div class="alert alert-danger" role="alert">
<strong>Please fill out at least one field.</strong>
</div>';
}
return #array;
}
A practical application of the code is below.
These variables are used as an example. This data would normally be supplied via a form.
my $title = 'Mario';
my $publisher = '';
my %params = (
title_like => $title,
publisher => $publisher,
status => 'a',
);
my #results = $results->AdvancedSearchFormResults(\%params);
print Data::Dumper::Dumper(\#results);
Dumper Results
$VAR1 = [
{
'ident' => '2109',
'title' => 'Mario Bros.',
'publisher' => 'Atari'
},
{
'ident' => '30',
'title' => 'Mario Bros.',
'publisher' => 'Atari'
},
{
'publisher' => 'Atari',
'ident' => '43',
'title' => 'Mario Bros.'
},
];

Answer 1

After a bit of headache and some intense googling I was able to come up with a solution.
The most basic solution to my problem is:
my #profiles = ('art', 'music', 'sports');
my #results;
my $blah;
my $sql;
foreach my $profile (#profiles) {
$sql = "SELECT
$profile.ident,
$profile.title,
$profile.status
FROM $profile
LEFT JOIN alternate_titles ON $profile.ident = alternate_titles.parent_ident
WHERE title like '%$blah%'
OR
CONCAT_WS(' ',alternate_titles.alt_title_001,alternate_titles.alt_title_002,alternate_titles.alt_title_003,alternate_titles.alt_title_004
AND alternate_titles.parent_table = '$profile'";
}
my $sth = $schema->prepare($sql) or die $schema->errstr;
$sth->execute() or die $sth->errstr;
while (my $data = $sth->fetchrow_hashref()) {
push(#results, $data);
}
This isn't immediately implementable in my code example, but this works as a great starting point.
I don't know that this is efficient, if anyone has a better solution, I'd love to see it.