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1 | package # Hide from PAUSE |
2 | DBIx::Class::SQLAHacks::Oracle; |
3 | |
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4 | use warnings; |
5 | use strict; |
6 | |
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7 | use base qw( DBIx::Class::SQLAHacks ); |
8 | use Carp::Clan qw/^DBIx::Class|^SQL::Abstract/; |
9 | |
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10 | # |
11 | # TODO: |
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12 | # - Review by experienced DBIC/SQL:A developers :-) |
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13 | # - Problem with count and connect_by look the TODO in t/73oracle.t |
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14 | # |
15 | |
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16 | sub new { |
17 | my $self = shift; |
18 | my %opts = (ref $_[0] eq 'HASH') ? %{$_[0]} : @_; |
19 | push @{$opts{special_ops}}, { |
20 | regex => qr/^prior$/i, |
21 | handler => '_where_field_PRIOR', |
22 | }; |
23 | |
24 | $self->SUPER::new (\%opts); |
25 | } |
26 | |
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27 | sub select { |
28 | my ($self, $table, $fields, $where, $order, @rest) = @_; |
29 | |
30 | $self->{_db_specific_attrs} = pop @rest; |
31 | |
32 | my ($sql, @bind) = $self->SUPER::select($table, $fields, $where, $order, @rest); |
33 | push @bind, @{$self->{_oracle_connect_by_binds}}; |
34 | |
35 | return wantarray ? ($sql, @bind) : $sql; |
36 | } |
37 | |
38 | sub _emulate_limit { |
39 | my ( $self, $syntax, $sql, $order, $rows, $offset ) = @_; |
40 | |
41 | my ($cb_sql, @cb_bind) = $self->_connect_by(); |
42 | $sql .= $cb_sql; |
43 | $self->{_oracle_connect_by_binds} = \@cb_bind; |
44 | |
45 | return $self->SUPER::_emulate_limit($syntax, $sql, $order, $rows, $offset); |
46 | } |
47 | |
48 | sub _connect_by { |
49 | my ($self) = @_; |
50 | my $attrs = $self->{_db_specific_attrs}; |
51 | my $sql = ''; |
52 | my @bind; |
53 | |
54 | if ( ref($attrs) eq 'HASH' ) { |
55 | if ( $attrs->{'start_with'} ) { |
56 | my ($ws, @wb) = $self->_recurse_where( $attrs->{'start_with'} ); |
57 | $sql .= $self->_sqlcase(' start with ') . $ws; |
58 | push @bind, @wb; |
59 | } |
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60 | if ( my $connect_by = $attrs->{'connect_by'} ) { |
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61 | my ($connect_by_sql, @connect_by_sql_bind) = $self->_recurse_where( $attrs->{'connect_by'} ); |
62 | $sql .= sprintf(" %s %s", |
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63 | ( $attrs->{'nocycle'} ) ? $self->_sqlcase('connect by nocycle') |
64 | : $self->_sqlcase('connect by'), |
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65 | $connect_by_sql, |
66 | ); |
67 | push @bind, @connect_by_sql_bind; |
68 | # $sql .= $self->_sqlcase(' connect by'); |
69 | # foreach my $key ( keys %$connect_by ) { |
70 | # $sql .= " $key = " . $connect_by->{$key}; |
71 | # } |
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72 | } |
73 | if ( $attrs->{'order_siblings_by'} ) { |
74 | $sql .= $self->_order_siblings_by( $attrs->{'order_siblings_by'} ); |
75 | } |
76 | } |
77 | |
78 | return wantarray ? ($sql, @bind) : $sql; |
79 | } |
80 | |
81 | sub _order_siblings_by { |
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82 | my ( $self, $arg ) = @_; |
83 | |
84 | my ( @sql, @bind ); |
85 | for my $c ( $self->_order_by_chunks($arg) ) { |
86 | $self->_SWITCH_refkind( |
87 | $c, |
88 | { |
89 | SCALAR => sub { push @sql, $c }, |
90 | ARRAYREF => sub { push @sql, shift @$c; push @bind, @$c }, |
91 | } |
92 | ); |
93 | } |
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94 | |
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95 | my $sql = |
96 | @sql |
97 | ? sprintf( '%s %s', $self->_sqlcase(' order siblings by'), join( ', ', @sql ) ) |
98 | : ''; |
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99 | |
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100 | return wantarray ? ( $sql, @bind ) : $sql; |
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101 | } |
102 | |
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103 | # we need to add a '=' only when PRIOR is used against a column diretly |
104 | # i.e. when it is invoked by a special_op callback |
105 | sub _where_field_PRIOR { |
106 | my ($self, $lhs, $op, $rhs) = @_; |
107 | my ($sql, @bind) = $self->_recurse_where ($rhs); |
108 | |
109 | $sql = sprintf ('%s = %s %s ', |
110 | $self->_convert($self->_quote($lhs)), |
111 | $self->_sqlcase ($op), |
112 | $sql |
113 | ); |
114 | |
115 | return ($sql, @bind); |
116 | } |
117 | |
c0024355 |
118 | 1; |
119 | |
120 | __END__ |
121 | |
122 | =pod |
123 | |
124 | =head1 NAME |
125 | |
126 | DBIx::Class::SQLAHacks::Oracle - adds hierarchical query support for Oracle to SQL::Abstract |
127 | |
128 | =head1 DESCRIPTION |
129 | |
130 | See L<DBIx::Class::Storage::DBI::Oracle::Generic> for more informations about |
131 | how to use hierarchical queries with DBIx::Class. |
132 | |
133 | =cut |