use strict;
use Tangram::Type::Abstract::Set;
package Tangram::Type::Set::FromMany;
use vars qw(@ISA);
@ISA = qw( Tangram::Type::Abstract::Set );
use Carp;
sub reschema
{
my ($self, $members, $class, $schema) = @_;
foreach my $member (keys %$members)
{
my $def = $members->{$member};
unless (ref($def))
{
$def = { class => $def };
$members->{$member} = $def;
}
$def->{table} ||= $schema->{normalize}->($def->{class} . "_$member", 'tablename');
$def->{coll} ||= 'coll';
$def->{item} ||= 'item';
}
return keys %$members;
}
sub defered_save
{
my ($self, $storage, $obj, $field, $def) = @_;
return if tied $obj->{$field};
my $coll_id = $storage->export_object($obj);
my $table = $def->{table};
my $coll_col = $def->{coll};
my $item_col = $def->{item};
$self->update
($storage, $obj, $field,
sub {
if ( $storage->can("t2_insert_hook") ) {
$storage->t2_insert_hook( ref($obj), $coll_id, $field, $_[1] );
}
my $sql = "DELETE FROM $table WHERE $coll_col = $coll_id AND $item_col = $_[0]";
$storage->sql_do($sql);
$sql = "INSERT INTO $table ($coll_col, $item_col)\n VALUES ($coll_id, $_[0])";
$storage->sql_do($sql);
},
sub
{
if ( $storage->can("t2_remove_hook") ) {
$storage->t2_remove_hook( ref($obj), $coll_id, $field, $_[1] );
}
my $sql = "DELETE FROM\n $table\nWHERE\n $coll_col = $coll_id AND\n $item_col = $_[0]";
$storage->sql_do($sql);
} );
}
#use Scriptalicious;
sub prefetch
{
my ($self, $storage, $def, $coll, $class, $member, $filter) = @_;
#my $t0 = start_timer();
my $ritem = $storage->remote($def->{class});
my $prefetch = $storage->{PREFETCH}{$class}{$member} ||= {}; # weakref
#print STDERR "prefetch1: ".show_delta($t0)."\n"; $t0 = start_timer();
my $ids = $storage->my_select_data( cols => [ $coll->{id} ], filter => $filter );
while (my ($id) = $ids->fetchrow)
{
$prefetch->{$id} = []
}
#print STDERR "prefetch2: ".show_delta($t0)."\n"; $t0 = start_timer();
my $includes = $coll->{$member}->includes($ritem);
$includes &= $filter if $filter;
my $cursor = $storage->my_cursor( $ritem, filter => $includes, retrieve => [ $coll->{id} ] );
#print STDERR "prefetch3: ".show_delta($t0)."\n"; $t0 = start_timer();
while (my $item = $cursor->current)
{
my ($coll_id) = $cursor->residue;
push @{ $prefetch->{$coll_id} }, $item;
$cursor->next;
}
#print STDERR "prefetch4: ".show_delta($t0)."\n";
return $prefetch;
}
sub demand
{
my ($self, $def, $storage, $obj, $member, $class) = @_;
my $set = Set::Object->new;
if (my $prefetch = $storage->{PREFETCH}{$class}{$member}{$storage->export_object($obj)})
{
print $Tangram::TRACE "getting ".$storage->id($obj)
.".$member from prefetch\n" if $Tangram::TRACE;
$set->insert(@$prefetch);
}
else
{
print $Tangram::TRACE "demanding ".$storage->id($obj)
.".$member from storage\n" if $Tangram::TRACE;
my $cursor = Tangram::Cursor::Coll->new($storage, $def->{class}, $storage->{db});
my $coll_id = $storage->export_object($obj);
my $coll_tid = $storage->alloc_table;
my $table = $def->{table};
my $item_tid = $cursor->{TARGET}->object->root_table;
my $coll_col = $def->{coll} || 'coll';
my $item_col = $def->{item} || 'item';
$cursor->{-coll_tid} = $coll_tid;
$cursor->{-coll_from} = "$table t$coll_tid";
$cursor->{-coll_where} = "t$coll_tid.$coll_col = $coll_id AND t$coll_tid.$item_col = t$item_tid.$storage->{schema}{sql}{id_col}";
$set->insert($cursor->select);
}
$self->remember_state($def, $storage, $obj, $member, $set);
$set;
}
sub erase
{
my ($self, $storage, $obj, $members, $coll_id) = @_;
$coll_id = $storage->{export_id}->($coll_id);
foreach my $member (keys %$members)
{
my $def = $members->{$member};
my $table = $def->{table} || $def->{class} . "_$member";
my $coll_col = $def->{coll} || 'coll';
my $sql = "DELETE FROM\n $table\nWHERE\n $coll_col = $coll_id";
if ( $storage->can("t2_remove_hook") ) {
$storage->t2_remove_hook
(
ref($obj),
$coll_id,
$member,
(map { $storage->id($_) }
$obj->{$member}->members),
);
}
if ($def->{aggreg})
{
my @content = $obj->{$member}->members;
$storage->sql_do($sql);
$storage->erase( @content ) ;
}
else
{
$storage->sql_do($sql);
}
}
}
sub query_expr
{
my ($self, $obj, $members, $tid) = @_;
map { Tangram::Expr::Coll::FromMany->new($obj, $_); } values %$members;
}
sub remote_expr
{
my ($self, $obj, $tid) = @_;
Tangram::Expr::Coll::FromMany->new($obj, $self);
}
$Tangram::Schema::TYPES{set} = Tangram::Type::Set::FromMany->new;
#---------------------------------------------------------------------
# Tangram::Type::Set::FromMany->coldefs($cols, $members, $schema, $class, $tables)
#
# Setup column mappings for many to many unordered mappings (link
# table)
#---------------------------------------------------------------------
sub coldefs
{
my ($self, $cols, $members, $schema, $class, $tables) = @_;
foreach my $member (values %$members)
{
my $COLS = $tables->{ $member->{table} }{COLS} ||= { };
$COLS->{$member->{coll}} = $schema->{sql}{id};
$COLS->{$member->{item}} = $schema->{sql}{id};
}
}
1;