1 package # Hide from PAUSE
2 DBIx::Class::SQLMaker::Oracle;
7 use base qw( DBIx::Class::SQLMaker );
8 use Carp::Clan qw/^DBIx::Class|^SQL::Abstract/;
12 use DBIx::Class::Optional::Dependencies;
13 croak('The following extra modules are required for Oracle-based Storages ' . DBIx::Class::Optional::Dependencies->req_missing_for ('id_shortener') )
14 unless DBIx::Class::Optional::Dependencies->req_ok_for ('id_shortener');
19 my %opts = (ref $_[0] eq 'HASH') ? %{$_[0]} : @_;
20 push @{$opts{special_ops}}, {
21 regex => qr/^prior$/i,
22 handler => '_where_field_PRIOR',
25 $self->SUPER::new (\%opts);
30 return map { @{ (delete $self->{"${_}_bind"}) || [] } } (qw/select from where oracle_connect_by group having order/);
38 my ($cb_sql, @cb_bind) = $self->_connect_by($rs_attrs);
39 push @{$self->{oracle_connect_by_bind}}, @cb_bind;
41 my $sql = $self->SUPER::_parse_rs_attrs(@_);
43 return "$cb_sql $sql";
47 my ($self, $attrs) = @_;
52 if ( ref($attrs) eq 'HASH' ) {
53 if ( $attrs->{'start_with'} ) {
54 my ($ws, @wb) = $self->_recurse_where( $attrs->{'start_with'} );
55 $sql .= $self->_sqlcase(' start with ') . $ws;
58 if ( my $connect_by = $attrs->{'connect_by'} || $attrs->{'connect_by_nocycle'} ) {
59 my ($connect_by_sql, @connect_by_sql_bind) = $self->_recurse_where( $connect_by );
60 $sql .= sprintf(" %s %s",
61 ( $attrs->{'connect_by_nocycle'} ) ? $self->_sqlcase('connect by nocycle')
62 : $self->_sqlcase('connect by'),
65 push @bind, @connect_by_sql_bind;
67 if ( $attrs->{'order_siblings_by'} ) {
68 $sql .= $self->_order_siblings_by( $attrs->{'order_siblings_by'} );
72 return wantarray ? ($sql, @bind) : $sql;
75 sub _order_siblings_by {
76 my ( $self, $arg ) = @_;
79 for my $c ( $self->_order_by_chunks($arg) ) {
80 $self->_SWITCH_refkind(
83 SCALAR => sub { push @sql, $c },
84 ARRAYREF => sub { push @sql, shift @$c; push @bind, @$c },
91 ? sprintf( '%s %s', $self->_sqlcase(' order siblings by'), join( ', ', @sql ) )
94 return wantarray ? ( $sql, @bind ) : $sql;
97 # we need to add a '=' only when PRIOR is used against a column diretly
98 # i.e. when it is invoked by a special_op callback
99 sub _where_field_PRIOR {
100 my ($self, $lhs, $op, $rhs) = @_;
101 my ($sql, @bind) = $self->_recurse_where ($rhs);
103 $sql = sprintf ('%s = %s %s ',
104 $self->_convert($self->_quote($lhs)),
105 $self->_sqlcase ($op),
109 return ($sql, @bind);
112 # this takes an identifier and shortens it if necessary
113 # optionally keywords can be passed as an arrayref to generate useful
115 sub _shorten_identifier {
116 my ($self, $to_shorten, $keywords) = @_;
118 # 30 characters is the identifier limit for Oracle
120 # we want at least 10 characters of the base36 md5
121 my $min_entropy = 10;
123 my $max_trunc = $max_len - $min_entropy - 1;
126 if length($to_shorten) <= $max_len;
128 croak 'keywords needs to be an arrayref'
129 if defined $keywords && ref $keywords ne 'ARRAY';
131 # if no keywords are passed use the identifier as one
132 my @keywords = @{$keywords || []};
133 @keywords = $to_shorten unless @keywords;
135 # get a base36 md5 of the identifier
137 require Math::BigInt;
138 require Math::Base36;
139 my $b36sum = Math::Base36::encode_base36(
140 Math::BigInt->from_hex (
141 '0x' . Digest::MD5::md5_hex ($to_shorten)
145 # switch from perl to java
147 my ($concat_len, @lengths);
149 $_ = ucfirst (lc ($_));
150 $_ =~ s/\_+(\w)/uc ($1)/eg;
152 push @lengths, length ($_);
153 $concat_len += $lengths[-1];
156 # if we are still too long - try to disemvowel non-capitals (not keyword starts)
157 if ($concat_len > $max_trunc) {
164 push @lengths, length ($_);
165 $concat_len += $lengths[-1];
169 # still too long - just start cuting proportionally
170 if ($concat_len > $max_trunc) {
171 my $trim_ratio = $max_trunc / $concat_len;
173 for my $i (0 .. $#keywords) {
174 $keywords[$i] = substr ($keywords[$i], 0, int ($trim_ratio * $lengths[$i] ) );
178 my $fin = join ('', @keywords);
179 my $fin_len = length $fin;
181 return sprintf ('%s_%s',
183 substr ($b36sum, 0, $max_len - $fin_len - 1),
187 sub _unqualify_colname {
188 my ($self, $fqcn) = @_;
190 return $self->_shorten_identifier($self->next::method($fqcn));
194 # Oracle has a different INSERT...RETURNING syntax
197 sub _insert_returning {
198 my ($self, $options) = @_;
200 my $f = $options->{returning};
202 my ($f_list, @f_names) = $self->_SWITCH_refkind($f, {
204 (join ', ', map { $self->_quote($_) } @$f),
217 my $rc_ref = $options->{returning_container}
218 or croak ('No returning container supplied for IR values');
220 @$rc_ref = (undef) x @f_names;
224 $self->_sqlcase(' returning'),
226 $self->_sqlcase('into'),
227 join (', ', ('?') x @f_names ),
230 $self->{bindtype} eq 'columns'
231 ? [ $f_names[$_] => \$rc_ref->[$_] ]