1 package Data::Query::Renderer::SQL::Naive;
4 use SQL::ReservedWords;
5 use Data::Query::Constants qw(
6 DQ_IDENTIFIER DQ_OPERATOR DQ_VALUE DQ_JOIN DQ_ALIAS
10 bless({ %{$_[1]||{}} }, (ref($_[0])||$_[0]))->BUILDALL;
15 $self->{reserved_ident_parts}
17 our $_DEFAULT_RESERVED ||= { map +($_ => 1), SQL::ReservedWords->words }
19 $self->{quote_chars}||=[''];
20 $self->{simple_ops}||=$self->_default_simple_ops;
24 sub _default_simple_ops {
26 (map +($_ => 'binop'), qw(= > < >= <=) ),
27 (map +($_ => 'unop'), (qw(NOT)) ),
28 (map +($_ => 'flatten'), qw(AND OR) ),
34 $self->_flatten_structure($self->_render(@_))
37 sub _flatten_structure {
38 my ($self, $struct) = @_;
44 elsif ($r eq 'ARRAY') {
45 my ($sql, @b) = @{$self->_flatten_structure($_)};
49 elsif ($r eq 'HASH') { push @bind, $_; () }
50 else { die "_flatten_structure can't handle ref type $r for $_" }
53 ($p[$_], (($p[$_+1]||',') eq ',') ? () : (' '))
60 # I present this to permit strange people to easily supply a patch to lc()
61 # their keywords, as I have heard many desire to do, lest they infect me
62 # with whatever malady caused this desire by their continued proximity for
63 # want of such a feature.
65 sub _format_keyword { $_[1] }
68 $_[0]->${\"_render_${\(lc($_[1]->{type})||'broken')}"}($_[1]);
73 require Data::Dumper::Concise;
74 die "Broken DQ entry: ".Data::Dumper::Concise::Dumper($dq);
77 sub _render_identifier {
78 die "Unidentified identifier (SQL can no has \$_)"
79 unless my @i = @{$_[1]->{elements}};
80 # handle single or paired quote chars
81 my ($q1, $q2) = @{$_[0]->{quote_chars}}[0,-1];
82 my $always_quote = $_[0]->{always_quote};
83 my $res_check = $_[0]->{reserved_ident_parts};
86 $_[0]->{identifier_sep}||'.',
88 $_ eq '*' # Yes, this means you can't have a column just called '*'.
89 ? $_ # Yes, this is a feature. Go shoot the DBA if he disagrees.
90 : ( # reserved are stored uc, quote if non-word
91 $always_quote || $res_check->{+uc} || /\W/
103 sub _operator_type { 'SQL.Naive' }
105 sub _render_operator {
106 my ($self, $dq) = @_;
107 my $op = $dq->{operator};
108 unless (exists $op->{$self->_operator_type}) {
109 $op->{$self->_operator_type} = $self->_convert_op($dq);
111 if (my $op_type = $self->{simple_ops}{my $op_name = $op->{$self->_operator_type}}) {
112 return $self->${\"_handle_op_type_${op_type}"}($op_name, $dq);
114 die "Couldn't render operator ".$op->{$self->_operator_type};
117 sub _handle_op_type_binop {
118 my ($self, $op_name, $dq) = @_;
119 die "${op_name} registered as binary op but args contain "
120 .scalar(@{$dq->{args}})." entries"
121 unless @{$dq->{args}} == 2;
123 $self->_render($dq->{args}[0]),
125 $self->_render($dq->{args}[1]),
129 sub _handle_op_type_unop {
130 my ($self, $op_name, $dq) = @_;
131 die "${op_name} registered as unary op but args contain "
132 .scalar(@{$dq->{args}})." entries"
133 unless @{$dq->{args}} == 1;
136 $self->_render($dq->{args}[0]),
140 sub _handle_op_type_flatten {
141 my ($self, $op_name, $dq) = @_;
142 my @argq = @{$dq->{args}};
144 while (my $arg = shift @argq) {
146 unless ($arg->{type} eq DQ_OPERATOR) {
147 push @arg_final, $arg;
151 my $op = $arg->{operator};
152 unless (exists $op->{$self->_operator_type}) {
153 $op->{$self->_operator_type} = $self->_convert_op($arg);
156 if ($op->{$self->_operator_type} eq $op_name) {
157 unshift @argq, @{$arg->{args}};
159 push @arg_final, $arg;
162 my @sql = ('(', map +($self->_render($_), $op_name), @arg_final);
163 $sql[-1] = ')'; # replace final AND or whatever with )
168 my ($self, $dq) = @_;
169 if (my $perl_op = $dq->{'operator'}->{'Perl'}) {
171 $_ eq '==' and return '=';
172 $_ eq 'eq' and return '=';
173 $_ eq '!' and return 'NOT';
175 return uc $perl_op; # hope!
177 die "Can't convert non-perl op yet";
181 my ($self, $dq) = @_;
182 die "Empty select list" unless @{$dq->{select}};
184 # it is, in fact, completely valid for there to be nothing for us
185 # to project from since many databases handle 'SELECT 1;' fine
188 ($_->{type} eq DQ_ALIAS
189 ? $self->_render_alias($_, 'AS')
195 # we put the commas inside the [] for each entry as a hint to the pretty
196 # printer downstream so now we need to eliminate the comma from the last
197 # entry - we know there always is one due to the die guard at the top
202 $self->_format_keyword('SELECT'),
204 # if present this may be a bare FROM, a FROM+WHERE, or a FROM+WHERE+GROUP
205 # since we're the SELECT and therefore always come first, we don't care.
207 ? ($self->_format_keyword('FROM'), @{$self->_render($dq->{from})})
214 my ($self, $dq, $as) = @_;
215 # FROM foo foo -> FROM foo
216 # FROM foo.bar bar -> FROM foo.bar
217 if ($dq->{alias}{type} eq DQ_IDENTIFIER) {
218 if ($dq->{alias}{elements}[-1] eq $dq->{as}) {
219 return $self->_render($dq->{alias});
223 $self->_render($dq->{alias}),
225 $self->_render_identifier({ elements => [ $dq->{as} ] })
229 sub _render_literal {
230 my ($self, $dq) = @_;
231 unless ($dq->{subtype} eq 'SQL') {
232 die "Can't render non-SQL literal";
240 my ($self, $dq) = @_;
241 my ($left, $right) = @{$dq->{join}};
242 die "No support for ON yet" if $dq->{on};
243 die "No support for LEFT/RIGHT yet" if $dq->{outer};
244 [ $self->_render($left), ',', $self->_render($right) ];