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'))
37 $self->_flatten_structure($self->_render(@_))
40 sub _flatten_structure {
41 my ($self, $struct) = @_;
47 elsif ($r eq 'ARRAY') {
48 my ($sql, @b) = @{$self->_flatten_structure($_)};
52 elsif ($r eq 'HASH') { push @bind, $_; () }
53 else { die "_flatten_structure can't handle ref type $r for $_" }
56 ($p[$_], (($p[$_+1]||',') eq ',') ? () : (' '))
63 # I present this to permit strange people to easily supply a patch to lc()
64 # their keywords, as I have heard many desire to do, lest they infect me
65 # with whatever malady caused this desire by their continued proximity for
66 # want of such a feature.
68 sub _format_keyword { $_[1] }
71 $_[0]->${\"_render_${\(lc($_[1]->{type})||'broken')}"}($_[1]);
76 require Data::Dumper::Concise;
77 die "Broken DQ entry: ".Data::Dumper::Concise::Dumper($dq);
80 sub _render_identifier {
81 die "Unidentified identifier (SQL can no has \$_)"
82 unless my @i = @{$_[1]->{elements}};
83 # handle single or paired quote chars
84 my ($q1, $q2) = @{$_[0]->{quote_chars}}[0,-1];
85 my $always_quote = $_[0]->{always_quote};
86 my $res_check = $_[0]->{reserved_ident_parts};
89 $_[0]->{identifier_sep}||'.',
91 $_ eq '*' # Yes, this means you can't have a column just called '*'.
92 ? $_ # Yes, this is a feature. Go shoot the DBA if he disagrees.
93 : ( # reserved are stored uc, quote if non-word
94 $always_quote || $res_check->{+uc} || /\W/
106 sub _operator_type { 'SQL.Naive' }
108 sub _render_operator {
109 my ($self, $dq) = @_;
110 my $op = $dq->{operator};
111 unless (exists $op->{$self->_operator_type}) {
112 $op->{$self->_operator_type} = $self->_convert_op($dq);
114 my $op_name = $op->{$self->_operator_type};
115 if (my $op_type = $self->{simple_ops}{$op_name}) {
116 return $self->${\"_handle_op_type_${op_type}"}($op_name, $dq);
117 } elsif (my $meth = $self->can("_handle_op_special_${op_name}")) {
118 return $self->$meth($dq);
120 #die "Couldn't render operator ".$op->{$self->_operator_type};
121 $self->_handle_op_type_binop($op_name, $dq);
124 sub _handle_op_type_binop {
125 my ($self, $op_name, $dq) = @_;
126 die "${op_name} registered as binary op but args contain "
127 .scalar(@{$dq->{args}})." entries"
128 unless @{$dq->{args}} == 2;
130 $self->_render($dq->{args}[0]),
132 $self->_render($dq->{args}[1]),
136 sub _handle_op_type_unop {
137 my ($self, $op_name, $dq) = @_;
138 die "${op_name} registered as unary op but args contain "
139 .scalar(@{$dq->{args}})." entries"
140 unless @{$dq->{args}} == 1;
144 $self->_render($dq->{args}[0]),
149 sub _handle_op_type_unop_reverse {
150 my ($self, $op_name, $dq) = @_;
151 die "${op_name} registered as unary op but args contain "
152 .scalar(@{$dq->{args}})." entries"
153 unless @{$dq->{args}} == 1;
155 $self->_render($dq->{args}[0]),
160 sub _handle_op_type_flatten {
161 my ($self, $op_name, $dq) = @_;
162 my @argq = @{$dq->{args}};
164 while (my $arg = shift @argq) {
166 unless ($arg->{type} eq DQ_OPERATOR) {
167 push @arg_final, $arg;
171 my $op = $arg->{operator};
172 unless (exists $op->{$self->_operator_type}) {
173 $op->{$self->_operator_type} = $self->_convert_op($arg);
176 if ($op->{$self->_operator_type} eq $op_name) {
177 unshift @argq, @{$arg->{args}};
179 push @arg_final, $arg;
182 my @sql = ('(', map +($self->_render($_), $op_name), @arg_final);
183 $sql[-1] = ')'; # replace final AND or whatever with )
187 sub _handle_op_type_in {
188 my ($self, $op, $dq) = @_;
189 my ($lhs, @in) = @{$dq->{args}};
190 my @rhs = ('(', map +($self->_render($_), ','), @in);
192 [ $self->_render($lhs), $op, @rhs ];
195 sub _handle_op_type_between {
196 my ($self, $op_name, $dq) = @_;
197 my ($lhs, $rhs1, $rhs2) = (map $self->_render($_), @{$dq->{args}});
198 [ $lhs, $op_name, $rhs1, 'AND', $rhs2 ];
202 my ($self, $dq) = @_;
203 if (my $perl_op = $dq->{'operator'}->{'Perl'}) {
205 $_ eq '==' and return '=';
206 $_ eq 'eq' and return '=';
207 $_ eq '!' and return 'NOT';
209 return uc $perl_op; # hope!
211 die "Can't convert non-perl op yet";
215 my ($self, $dq) = @_;
216 die "Empty select list" unless @{$dq->{select}};
218 # it is, in fact, completely valid for there to be nothing for us
219 # to project from since many databases handle 'SELECT 1;' fine
222 ($_->{type} eq DQ_ALIAS
223 ? $self->_render_alias($_, $self->_format_keyword('AS'))
229 # we put the commas inside the [] for each entry as a hint to the pretty
230 # printer downstream so now we need to eliminate the comma from the last
231 # entry - we know there always is one due to the die guard at the top
236 $self->_format_keyword('SELECT'),
238 # if present this may be a bare FROM, a FROM+WHERE, or a FROM+WHERE+GROUP
239 # since we're the SELECT and therefore always come first, we don't care.
241 ? ($self->_format_keyword('FROM'), @{$self->_render($dq->{from})})
248 my ($self, $dq, $as) = @_;
249 # FROM foo foo -> FROM foo
250 # FROM foo.bar bar -> FROM foo.bar
251 if ($dq->{alias}{type} eq DQ_IDENTIFIER) {
252 if ($dq->{alias}{elements}[-1] eq $dq->{as}) {
253 return $self->_render($dq->{alias});
257 $self->_render($dq->{alias}),
259 $self->_render_identifier({ elements => [ $dq->{as} ] })
263 sub _render_literal {
264 my ($self, $dq) = @_;
265 unless ($dq->{subtype} eq 'SQL') {
266 die "Can't render non-SQL literal";
269 $dq->{literal}, @{$dq->{values}||[]}
274 my ($self, $dq) = @_;
275 my ($left, $right) = @{$dq->{join}};
276 die "No support for ON yet" if $dq->{on};
277 die "No support for LEFT/RIGHT yet" if $dq->{outer};
278 [ $self->_render($left), ',', $self->_render($right) ];
282 my ($self, $dq) = @_;
283 my ($from, $where) = @{$dq}{qw(from where)};
285 ($from ? $self->_render($from) : ()),
286 $self->_format_keyword('WHERE'),
287 $self->_render($where)
292 my ($self, $dq) = @_;
294 $self->_format_keyword('ORDER BY'),
295 $self->_render($dq->{by}),
296 ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ())
299 while ($from = $dq->{from}) {
300 last unless $from->{type} eq DQ_ORDER;
304 $self->_render($dq->{by}),
305 ($dq->{direction} ? $self->_format_keyword($dq->{direction}) : ())
308 unshift @ret, $self->_render($from) if $from;