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 DQ_ORDER
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 +($_ => 'binop'), qw(= > < >= <= != LIKE), 'NOT LIKE' ),
27 (map +($_ => 'unop'), qw(NOT) ),
28 (map +($_ => 'unop_reverse'), ('IS NULL', 'IS NOT NULL')),
29 (map +($_ => 'flatten'), qw(AND OR) ),
30 (map +($_ => 'in'), ('IN', 'NOT IN')),
31 (map +($_ => 'between'), ('BETWEEN', 'NOT BETWEEN')),
38 $self->_flatten_structure($self->_render(@_))
41 sub _flatten_structure {
42 my ($self, $struct) = @_;
48 elsif ($r eq 'ARRAY') {
49 my ($sql, @b) = @{$self->_flatten_structure($_)};
53 elsif ($r eq 'HASH') { push @bind, $_; () }
54 else { die "_flatten_structure can't handle ref type $r for $_" }
57 ($p[$_], (($p[$_+1]||',') eq ',') ? () : (' '))
64 # I present this to permit strange people to easily supply a patch to lc()
65 # their keywords, as I have heard many desire to do, lest they infect me
66 # with whatever malady caused this desire by their continued proximity for
67 # want of such a feature.
69 sub _format_keyword { $_[1] }
72 $_[0]->${\"_render_${\(lc($_[1]->{type})||'broken')}"}($_[1]);
77 require Data::Dumper::Concise;
78 die "Broken DQ entry: ".Data::Dumper::Concise::Dumper($dq);
81 sub _render_identifier {
82 die "Unidentified identifier (SQL can no has \$_)"
83 unless my @i = @{$_[1]->{elements}};
84 # handle single or paired quote chars
85 my ($q1, $q2) = @{$_[0]->{quote_chars}}[0,-1];
86 my $always_quote = $_[0]->{always_quote};
87 my $res_check = $_[0]->{reserved_ident_parts};
90 $_[0]->{identifier_sep}||'.',
92 $_ eq '*' # Yes, this means you can't have a column just called '*'.
93 ? $_ # Yes, this is a feature. Go shoot the DBA if he disagrees.
94 : ( # reserved are stored uc, quote if non-word
95 $always_quote || $res_check->{+uc} || /\W/
104 defined($_[1]->{value})
109 sub _operator_type { 'SQL.Naive' }
111 sub _render_operator {
112 my ($self, $dq) = @_;
113 my $op = $dq->{operator};
114 unless (exists $op->{$self->_operator_type}) {
115 $op->{$self->_operator_type} = $self->_convert_op($dq);
117 my $op_name = $op->{$self->_operator_type};
118 if (my $op_type = $self->{simple_ops}{$op_name}) {
119 return $self->${\"_handle_op_type_${op_type}"}($op_name, $dq);
120 } elsif (my $meth = $self->can("_handle_op_special_${op_name}")) {
121 return $self->$meth($dq);
123 #die "Couldn't render operator ".$op->{$self->_operator_type};
124 $self->_handle_op_type_binop($op_name, $dq);
127 sub _handle_op_type_binop {
128 my ($self, $op_name, $dq) = @_;
129 die "${op_name} registered as binary op but args contain "
130 .scalar(@{$dq->{args}})." entries"
131 unless @{$dq->{args}} == 2;
133 $self->_render($dq->{args}[0]),
135 $self->_render($dq->{args}[1]),
139 sub _handle_op_type_unop {
140 my ($self, $op_name, $dq) = @_;
141 die "${op_name} registered as unary op but args contain "
142 .scalar(@{$dq->{args}})." entries"
143 unless @{$dq->{args}} == 1;
147 $self->_render($dq->{args}[0]),
152 sub _handle_op_type_unop_reverse {
153 my ($self, $op_name, $dq) = @_;
154 die "${op_name} registered as unary op but args contain "
155 .scalar(@{$dq->{args}})." entries"
156 unless @{$dq->{args}} == 1;
158 $self->_render($dq->{args}[0]),
163 sub _handle_op_type_flatten {
164 my ($self, $op_name, $dq) = @_;
165 my @argq = @{$dq->{args}};
167 while (my $arg = shift @argq) {
169 unless ($arg->{type} eq DQ_OPERATOR) {
170 push @arg_final, $arg;
174 my $op = $arg->{operator};
175 unless (exists $op->{$self->_operator_type}) {
176 $op->{$self->_operator_type} = $self->_convert_op($arg);
179 if ($op->{$self->_operator_type} eq $op_name) {
180 unshift @argq, @{$arg->{args}};
182 push @arg_final, $arg;
185 my @sql = ('(', map +($self->_render($_), $op_name), @arg_final);
186 $sql[-1] = ')'; # replace final AND or whatever with )
190 sub _handle_op_type_in {
191 my ($self, $op, $dq) = @_;
192 my ($lhs, @in) = @{$dq->{args}};
193 my @rhs = ('(', map +($self->_render($_), ','), @in);
195 [ $self->_render($lhs), $op, @rhs ];
198 sub _handle_op_type_between {
199 my ($self, $op_name, $dq) = @_;
200 my ($lhs, $rhs1, $rhs2) = (map $self->_render($_), @{$dq->{args}});
201 [ $lhs, $op_name, $rhs1, 'AND', $rhs2 ];
204 sub _handle_op_type_apply {
205 my ($self, $op_name, $dq) = @_;
206 my ($func, @args) = @{$dq->{args}};
207 die "Function name must be identifier"
208 unless $func->{type} eq DQ_IDENTIFIER;
209 my $ident = $self->_render($func)->[0];
212 (map $self->_render($_), @args),
218 my ($self, $dq) = @_;
219 if (my $perl_op = $dq->{'operator'}->{'Perl'}) {
221 $_ eq '==' and return '=';
222 $_ eq 'eq' and return '=';
223 $_ eq '!' and return 'NOT';
225 return uc $perl_op; # hope!
227 die "Can't convert non-perl op yet";
231 my ($self, $dq) = @_;
232 die "Empty select list" unless @{$dq->{select}};
234 # it is, in fact, completely valid for there to be nothing for us
235 # to project from since many databases handle 'SELECT 1;' fine
238 ($_->{type} eq DQ_ALIAS
239 ? $self->_render_alias($_, $self->_format_keyword('AS'))
245 # we put the commas inside the [] for each entry as a hint to the pretty
246 # printer downstream so now we need to eliminate the comma from the last
247 # entry - we know there always is one due to the die guard at the top
252 $self->_format_keyword('SELECT'),
254 # if present this may be a bare FROM, a FROM+WHERE, or a FROM+WHERE+GROUP
255 # since we're the SELECT and therefore always come first, we don't care.
257 ? ($self->_format_keyword('FROM'), @{$self->_render($dq->{from})})
264 my ($self, $dq, $as) = @_;
265 # FROM foo foo -> FROM foo
266 # FROM foo.bar bar -> FROM foo.bar
267 if ($dq->{alias}{type} eq DQ_IDENTIFIER) {
268 if ($dq->{alias}{elements}[-1] eq $dq->{as}) {
269 return $self->_render($dq->{alias});
273 $self->_render($dq->{alias}),
275 $self->_render_identifier({ elements => [ $dq->{as} ] })
279 sub _render_literal {
280 my ($self, $dq) = @_;
281 unless ($dq->{subtype} eq 'SQL') {
282 die "Can't render non-SQL literal";
285 $dq->{literal}, @{$dq->{values}||[]}
290 my ($self, $dq) = @_;
291 my ($left, $right) = @{$dq->{join}};
292 die "No support for ON yet" if $dq->{on};
293 die "No support for LEFT/RIGHT yet" if $dq->{outer};
294 [ $self->_render($left), ',', $self->_render($right) ];
298 my ($self, $dq) = @_;
299 my ($from, $where) = @{$dq}{qw(from where)};
301 ($from ? $self->_render($from) : ()),
302 $self->_format_keyword('WHERE'),
303 $self->_render($where)
308 my ($self, $dq) = @_;
310 $self->_format_keyword('ORDER BY'),
311 $self->_render($dq->{by}),
312 ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ())
315 while ($from = $dq->{from}) {
316 last unless $from->{type} eq DQ_ORDER;
320 $self->_render($dq->{by}),
321 ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ())
324 unshift @ret, $self->_render($from) if $from;