1 package # Hide from PAUSE
2 DBIx::Class::SQLMaker::Oracle;
8 require DBIx::Class::Optional::Dependencies;
9 if (my $missing = DBIx::Class::Optional::Dependencies->req_missing_for ('id_shortener') ) {
10 die "The following extra modules are required for Oracle-based Storages: $missing\n";
15 use base 'DBIx::Class::SQLMaker';
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->next::method(\%opts);
30 return map { @{ (delete $self->{"${_}_bind"}) || [] } } (qw/pre_select select from where oracle_connect_by group having order limit/);
38 my ($cb_sql, @cb_bind) = $self->_connect_by($rs_attrs);
39 push @{$self->{oracle_connect_by_bind}}, @cb_bind;
41 my $sql = $self->next::method(@_);
43 return "$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) ) {
91 ? sprintf( '%s %s', $self->_sqlcase(' order siblings by'), join( ', ', @sql ) )
94 return wantarray ? ( $sql, @bind ) : $sql;
97 # we need to add a '=' only when PRIOR is used against a column directly
98 # i.e. when it is invoked by a special_op callback
99 sub _where_field_PRIOR {
100 my ($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 ($sql, @bind);
112 # use this codepath to hook all identifiers and mangle them if necessary
113 # this is invoked regardless of quoting being on or off
115 my ($self, $label) = @_;
117 return '' unless defined $label;
118 return ${$label} if ref($label) eq 'SCALAR';
120 $label =~ s/ ( [^\.]{31,} ) /$self->_shorten_identifier($1)/gxe;
122 $self->next::method($label);
125 # this takes an identifier and shortens it if necessary
126 # optionally keywords can be passed as an arrayref to generate useful
128 sub _shorten_identifier {
129 my ($self, $to_shorten, $keywords) = @_;
131 # 30 characters is the identifier limit for Oracle
133 # we want at least 10 characters of the base36 md5
134 my $min_entropy = 10;
136 my $max_trunc = $max_len - $min_entropy - 1;
139 if length($to_shorten) <= $max_len;
141 $self->throw_exception("'keywords' needs to be an arrayref")
142 if defined $keywords && ref $keywords ne 'ARRAY';
144 # if no keywords are passed use the identifier as one
145 my @keywords = @{$keywords || []};
146 @keywords = $to_shorten unless @keywords;
148 # get a base36 md5 of the identifier
149 my $b36sum = Math::Base36::encode_base36(
150 Math::BigInt->from_hex (
151 '0x' . Digest::MD5::md5_hex ($to_shorten)
155 # switch from perl to java
157 my ($concat_len, @lengths);
159 $_ = ucfirst (lc ($_));
160 $_ =~ s/\_+(\w)/uc ($1)/eg;
162 push @lengths, length ($_);
163 $concat_len += $lengths[-1];
166 # if we are still too long - try to disemvowel non-capitals (not keyword starts)
167 if ($concat_len > $max_trunc) {
174 push @lengths, length ($_);
175 $concat_len += $lengths[-1];
179 # still too long - just start cutting proportionally
180 if ($concat_len > $max_trunc) {
181 my $trim_ratio = $max_trunc / $concat_len;
183 for my $i (0 .. $#keywords) {
184 $keywords[$i] = substr ($keywords[$i], 0, int ($trim_ratio * $lengths[$i] ) );
188 my $fin = join ('', @keywords);
189 my $fin_len = length $fin;
191 return sprintf ('%s_%s',
193 substr ($b36sum, 0, $max_len - $fin_len - 1),
197 sub _unqualify_colname {
198 my ($self, $fqcn) = @_;
200 return $self->_shorten_identifier($self->next::method($fqcn));
204 # Oracle has a different INSERT...RETURNING syntax
207 sub _insert_returning {
208 my ($self, $options) = @_;
210 my $f = $options->{returning};
212 my ($f_list, @f_names) = do {
219 elsif (ref $f eq 'ARRAY') {
221 (join ', ', map { $self->_quote($_) } @$f),
225 elsif (ref $f eq 'SCALAR') {
232 $self->throw_exception("Unsupported INSERT RETURNING option $f");
236 my $rc_ref = $options->{returning_container}
237 or $self->throw_exception('No returning container supplied for IR values');
239 @$rc_ref = (undef) x @f_names;
243 $self->_sqlcase(' returning'),
245 $self->_sqlcase('into'),
246 join (', ', ('?') x @f_names ),
249 $self->{bindtype} eq 'columns'
250 ? [ $f_names[$_] => \$rc_ref->[$_] ]