package # Hide from PAUSE
DBIx::Class::SQLAHacks::Oracle;
+use warnings;
+use strict;
+
use base qw( DBIx::Class::SQLAHacks );
use Carp::Clan qw/^DBIx::Class|^SQL::Abstract/;
-#
-# TODO:
-# - Check the parameter syntax of connect_by
-# - Review by experienced DBIC/SQL:A developers :-)
-# - Check NOCYCLE parameter
-# http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/pseudocolumns001.htm#i1009434
-#
+sub new {
+ my $self = shift;
+ my %opts = (ref $_[0] eq 'HASH') ? %{$_[0]} : @_;
+ push @{$opts{special_ops}}, {
+ regex => qr/^prior$/i,
+ handler => '_where_field_PRIOR',
+ };
-sub select {
- my ($self, $table, $fields, $where, $order, @rest) = @_;
+ $self->SUPER::new (\%opts);
+}
- $self->{_db_specific_attrs} = pop @rest;
+sub _assemble_binds {
+ my $self = shift;
+ return map { @{ (delete $self->{"${_}_bind"}) || [] } } (qw/from where oracle_connect_by having order/);
+}
- my ($sql, @bind) = $self->SUPER::select($table, $fields, $where, $order, @rest);
- push @bind, @{$self->{_oracle_connect_by_binds}};
- return wantarray ? ($sql, @bind) : $sql;
-}
+sub _parse_rs_attrs {
+ my $self = shift;
+ my ($rs_attrs) = @_;
-sub _emulate_limit {
- my ( $self, $syntax, $sql, $order, $rows, $offset ) = @_;
+ my ($cb_sql, @cb_bind) = $self->_connect_by($rs_attrs);
+ push @{$self->{oracle_connect_by_bind}}, @cb_bind;
- my ($cb_sql, @cb_bind) = $self->_connect_by();
- $sql .= $cb_sql;
- $self->{_oracle_connect_by_binds} = \@cb_bind;
+ my $sql = $self->SUPER::_parse_rs_attrs(@_);
- return $self->SUPER::_emulate_limit($syntax, $sql, $order, $rows, $offset);
+ return "$cb_sql $sql";
}
sub _connect_by {
- my ($self) = @_;
- my $attrs = $self->{_db_specific_attrs};
+ my ($self, $attrs) = @_;
+
my $sql = '';
my @bind;
$sql .= $self->_sqlcase(' start with ') . $ws;
push @bind, @wb;
}
- if ( my $connect_by = $attrs->{'connect_by'}) {
- my ($connect_by_sql, @connect_by_sql_bind) = $self->_recurse_where( $attrs->{'connect_by'} );
+ if ( my $connect_by = $attrs->{'connect_by'} || $attrs->{'connect_by_nocycle'} ) {
+ my ($connect_by_sql, @connect_by_sql_bind) = $self->_recurse_where( $connect_by );
$sql .= sprintf(" %s %s",
- $self->_sqlcase('connect by'),
+ ( $attrs->{'connect_by_nocycle'} ) ? $self->_sqlcase('connect by nocycle')
+ : $self->_sqlcase('connect by'),
$connect_by_sql,
);
push @bind, @connect_by_sql_bind;
- # $sql .= $self->_sqlcase(' connect by');
- # foreach my $key ( keys %$connect_by ) {
- # $sql .= " $key = " . $connect_by->{$key};
- # }
}
if ( $attrs->{'order_siblings_by'} ) {
$sql .= $self->_order_siblings_by( $attrs->{'order_siblings_by'} );
}
sub _order_siblings_by {
- my $self = shift;
- my $ref = ref $_[0];
+ my ( $self, $arg ) = @_;
+
+ my ( @sql, @bind );
+ for my $c ( $self->_order_by_chunks($arg) ) {
+ $self->_SWITCH_refkind(
+ $c,
+ {
+ SCALAR => sub { push @sql, $c },
+ ARRAYREF => sub { push @sql, shift @$c; push @bind, @$c },
+ }
+ );
+ }
+
+ my $sql =
+ @sql
+ ? sprintf( '%s %s', $self->_sqlcase(' order siblings by'), join( ', ', @sql ) )
+ : '';
+
+ return wantarray ? ( $sql, @bind ) : $sql;
+}
+
+# we need to add a '=' only when PRIOR is used against a column diretly
+# i.e. when it is invoked by a special_op callback
+sub _where_field_PRIOR {
+ my ($self, $lhs, $op, $rhs) = @_;
+ my ($sql, @bind) = $self->_recurse_where ($rhs);
+
+ $sql = sprintf ('%s = %s %s ',
+ $self->_convert($self->_quote($lhs)),
+ $self->_sqlcase ($op),
+ $sql
+ );
+
+ return ($sql, @bind);
+}
+
+# this takes an identifier and shortens it if necessary
+# optionally keywords can be passed as an arrayref to generate useful
+# identifiers
+sub _shorten_identifier {
+ my ($self, $to_shorten, $keywords) = @_;
+
+ # 30 characters is the identifier limit for Oracle
+ my $max_len = 30;
+ # we want at least 10 characters of the base36 md5
+ my $min_entropy = 10;
+
+ my $max_trunc = $max_len - $min_entropy - 1;
+
+ return $to_shorten
+ if length($to_shorten) <= $max_len;
+
+ croak 'keywords needs to be an arrayref'
+ if defined $keywords && ref $keywords ne 'ARRAY';
+
+ # if no keywords are passed use the identifier as one
+ my @keywords = @{$keywords || []};
+ @keywords = $to_shorten unless @keywords;
+
+ # get a base36 md5 of the identifier
+ require Digest::MD5;
+ require Math::BigInt;
+ require Math::Base36;
+ my $b36sum = Math::Base36::encode_base36(
+ Math::BigInt->from_hex (
+ '0x' . Digest::MD5::md5_hex ($to_shorten)
+ )
+ );
+
+ # switch from perl to java
+ # get run-length
+ my ($concat_len, @lengths);
+ for (@keywords) {
+ $_ = ucfirst (lc ($_));
+ $_ =~ s/\_+(\w)/uc ($1)/eg;
+
+ push @lengths, length ($_);
+ $concat_len += $lengths[-1];
+ }
+
+ # if we are still too long - try to disemvowel non-capitals (not keyword starts)
+ if ($concat_len > $max_trunc) {
+ $concat_len = 0;
+ @lengths = ();
+
+ for (@keywords) {
+ $_ =~ s/[aeiou]//g;
+
+ push @lengths, length ($_);
+ $concat_len += $lengths[-1];
+ }
+ }
+
+ # still too long - just start cuting proportionally
+ if ($concat_len > $max_trunc) {
+ my $trim_ratio = $max_trunc / $concat_len;
+
+ for my $i (0 .. $#keywords) {
+ $keywords[$i] = substr ($keywords[$i], 0, int ($trim_ratio * $lengths[$i] ) );
+ }
+ }
+
+ my $fin = join ('', @keywords);
+ my $fin_len = length $fin;
+
+ return sprintf ('%s_%s',
+ $fin,
+ substr ($b36sum, 0, $max_len - $fin_len - 1),
+ );
+}
- my @vals = $ref eq 'ARRAY' ? @{$_[0]} :
- $ref eq 'SCALAR' ? ${$_[0]} :
- $ref eq '' ? $_[0] :
- puke( "Unsupported data struct $ref for ORDER SIBILINGS BY" );
+sub _unqualify_colname {
+ my ($self, $fqcn) = @_;
- my $val = join ', ', map { $self->_quote($_) } @vals;
- return $val ? $self->_sqlcase(' order siblings by')." $val" : '';
+ return $self->_shorten_identifier($self->next::method($fqcn));
}
1;
=head1 DESCRIPTION
-See L<DBIx::Class::Storage::DBI::Oracle::Generic> for more informations about
+See L<DBIx::Class::Storage::DBI::Oracle::Generic> for more information about
how to use hierarchical queries with DBIx::Class.
=cut
projects / dbsrgits/DBIx-Class.git / blobdiff