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1 | package DBIx::Class::SQLMaker; |
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2 | |
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3 | use strict; |
4 | use warnings; |
5 | |
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6 | =head1 NAME |
7 | |
8 | DBIx::Class::SQLMaker - An SQL::Abstract-based SQL maker class |
9 | |
10 | =head1 DESCRIPTION |
11 | |
12 | This module is a subclass of L<SQL::Abstract> and includes a number of |
13 | DBIC-specific workarounds, not yet suitable for inclusion into the |
14 | L<SQL::Abstract> core. It also provides all (and more than) the functionality |
15 | of L<SQL::Abstract::Limit>, see L<DBIx::Class::SQLMaker::LimitDialects> for |
16 | more info. |
17 | |
18 | Currently the enhancements to L<SQL::Abstract> are: |
19 | |
20 | =over |
21 | |
22 | =item * Support for C<JOIN> statements (via extended C<table/from> support) |
23 | |
24 | =item * Support of functions in C<SELECT> lists |
25 | |
26 | =item * C<GROUP BY>/C<HAVING> support (via extensions to the order_by parameter) |
27 | |
28 | =item * Support of C<...FOR UPDATE> type of select statement modifiers |
29 | |
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30 | =item * The L</-ident> operator |
31 | |
32 | =item * The L</-value> operator |
33 | |
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34 | =back |
35 | |
36 | =cut |
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37 | |
38 | use base qw/ |
39 | SQL::Abstract |
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40 | DBIx::Class::SQLMaker::LimitDialects |
6a247f33 |
41 | /; |
42 | use mro 'c3'; |
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43 | |
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44 | use Module::Runtime qw(use_module); |
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45 | use Sub::Name 'subname'; |
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46 | use DBIx::Class::Carp; |
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47 | use DBIx::Class::Exception; |
48 | use Moo; |
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49 | use namespace::clean; |
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50 | |
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51 | has limit_dialect => ( |
52 | is => 'rw', default => sub { 'LimitOffset' }, |
53 | trigger => sub { shift->clear_renderer_class } |
54 | ); |
55 | |
56 | our %LIMIT_DIALECT_MAP = ( |
57 | 'GenericSubQ' => 'GenericSubquery', |
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58 | ); |
59 | |
60 | sub mapped_limit_dialect { |
61 | my ($self) = @_; |
62 | my $unmapped = $self->limit_dialect; |
63 | $LIMIT_DIALECT_MAP{$unmapped}||$unmapped; |
64 | } |
65 | |
66 | around _build_renderer_roles => sub { |
67 | my ($orig, $self) = (shift, shift); |
68 | return ( |
69 | $self->$orig(@_), |
70 | 'Data::Query::Renderer::SQL::Slice::'.$self->mapped_limit_dialect |
71 | ); |
72 | }; |
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73 | |
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74 | # for when I need a normalized l/r pair |
75 | sub _quote_chars { |
76 | map |
77 | { defined $_ ? $_ : '' } |
78 | ( ref $_[0]->{quote_char} ? (@{$_[0]->{quote_char}}) : ( ($_[0]->{quote_char}) x 2 ) ) |
79 | ; |
80 | } |
81 | |
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82 | sub _build_converter_class { |
83 | Module::Runtime::use_module('DBIx::Class::SQLMaker::Converter') |
84 | } |
85 | |
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86 | # FIXME when we bring in the storage weaklink, check its schema |
87 | # weaklink and channel through $schema->throw_exception |
88 | sub throw_exception { DBIx::Class::Exception->throw($_[1]) } |
89 | |
b2b22cd6 |
90 | BEGIN { |
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91 | # reinstall the belch()/puke() functions of SQL::Abstract with custom versions |
70c28808 |
92 | # that use DBIx::Class::Carp/DBIx::Class::Exception instead of plain Carp |
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93 | no warnings qw/redefine/; |
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94 | |
95 | *SQL::Abstract::belch = subname 'SQL::Abstract::belch' => sub (@) { |
96 | my($func) = (caller(1))[3]; |
97 | carp "[$func] Warning: ", @_; |
98 | }; |
99 | |
100 | *SQL::Abstract::puke = subname 'SQL::Abstract::puke' => sub (@) { |
101 | my($func) = (caller(1))[3]; |
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102 | __PACKAGE__->throw_exception("[$func] Fatal: " . join ('', @_)); |
2ea6032a |
103 | }; |
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104 | |
105 | # Current SQLA pollutes its namespace - clean for the time being |
106 | namespace::clean->clean_subroutines(qw/SQL::Abstract carp croak confess/); |
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107 | } |
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108 | |
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109 | # the "oh noes offset/top without limit" constant |
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110 | # limited to 31 bits for sanity (and consistency, |
111 | # since it may be handed to the like of sprintf %u) |
112 | # |
113 | # Also *some* builds of SQLite fail the test |
114 | # some_column BETWEEN ? AND ?: 1, 4294967295 |
115 | # with the proper integer bind attrs |
116 | # |
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117 | # Implemented as a method, since ::Storage::DBI also |
118 | # refers to it (i.e. for the case of software_limit or |
119 | # as the value to abuse with MSSQL ordered subqueries) |
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120 | sub __max_int () { 0x7FFFFFFF }; |
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121 | |
e39f188a |
122 | # poor man's de-qualifier |
123 | sub _quote { |
124 | $_[0]->next::method( ( $_[0]{_dequalify_idents} and ! ref $_[1] ) |
125 | ? $_[1] =~ / ([^\.]+) $ /x |
126 | : $_[1] |
127 | ); |
128 | } |
129 | |
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130 | sub _where_op_NEST { |
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131 | carp_unique ("-nest in search conditions is deprecated, you most probably wanted:\n" |
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132 | .q|{..., -and => [ \%cond0, \@cond1, \'cond2', \[ 'cond3', [ col => bind ] ], etc. ], ... }| |
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133 | ); |
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134 | |
135 | shift->next::method(@_); |
136 | } |
137 | |
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138 | # Handle limit-dialect selection |
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139 | sub select { |
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140 | my ($self, $table, $fields, $where, $rs_attrs, $limit, $offset) = @_; |
141 | |
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142 | if (defined $offset) { |
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143 | $self->throw_exception('A supplied offset must be a non-negative integer') |
6a247f33 |
144 | if ( $offset =~ /\D/ or $offset < 0 ); |
145 | } |
146 | $offset ||= 0; |
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147 | |
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148 | if (defined $limit) { |
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149 | $self->throw_exception('A supplied limit must be a positive integer') |
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150 | if ( $limit =~ /\D/ or $limit <= 0 ); |
151 | } |
152 | elsif ($offset) { |
153 | $limit = $self->__max_int; |
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154 | } |
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155 | |
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156 | my %final_attrs = (%{$rs_attrs||{}}, limit => $limit, offset => $offset); |
157 | |
158 | if ($limit or $offset) { |
159 | my %slice_stability = $self->renderer->slice_stability; |
160 | |
161 | if (my $stability = $slice_stability{$offset ? 'offset' : 'limit'}) { |
162 | my $source = $rs_attrs->{_rsroot_rsrc}; |
163 | unless ( |
164 | $final_attrs{order_is_stable} |
165 | = $final_attrs{preserve_order} |
166 | = $source->schema->storage |
167 | ->_order_by_is_stable( |
168 | @final_attrs{qw(from order_by where)} |
169 | ) |
170 | ) { |
171 | if ($stability eq 'requires') { |
172 | if ($self->converter->_order_by_to_dq($final_attrs{order_by})) { |
173 | $self->throw_exception( |
174 | $self->limit_dialect.' limit/offset implementation requires a stable order for offset' |
175 | ); |
176 | } |
177 | if (my $ident_cols = $source->_identifying_column_set) { |
178 | $final_attrs{order_by} = [ |
179 | map "$final_attrs{alias}.$_", @$ident_cols |
180 | ]; |
181 | $final_attrs{order_is_stable} = 1; |
182 | } else { |
183 | $self->throw_exception(sprintf( |
184 | 'Unable to auto-construct stable order criteria for "skimming type" |
185 | limit ' |
186 | . "dialect based on source '%s'", $source->name) ); |
187 | } |
188 | } |
189 | } |
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190 | |
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191 | } |
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192 | |
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193 | my %slice_subquery = $self->renderer->slice_subquery; |
194 | |
195 | if (my $subquery = $slice_subquery{$offset ? 'offset' : 'limit'}) { |
196 | $fields = [ map { |
197 | my $f = $fields->[$_]; |
198 | if (ref $f) { |
199 | $f = { '' => $f } unless ref($f) eq 'HASH'; |
200 | ($f->{-as} ||= $final_attrs{as}[$_]) =~ s/\Q${\$self->name_sep}/__/g; |
201 | } elsif ($f !~ /^\Q$final_attrs{alias}${\$self->name_sep}/) { |
202 | $f = { '' => $f }; |
203 | ($f->{-as} ||= $final_attrs{as}[$_]) =~ s/\Q${\$self->name_sep}/__/g; |
204 | } |
205 | $f; |
206 | } 0 .. $#$fields ]; |
67341081 |
207 | } |
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208 | } |
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209 | |
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210 | my ($sql, @bind) = $self->next::method ($table, $fields, $where, $final_attrs{order_by}, \%final_attrs ); |
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211 | |
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212 | $sql .= $self->_lock_select ($rs_attrs->{for}) |
213 | if $rs_attrs->{for}; |
214 | |
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215 | return wantarray ? ($sql, @bind) : $sql; |
583a0c65 |
216 | } |
217 | |
218 | sub _assemble_binds { |
219 | my $self = shift; |
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220 | return map { @{ (delete $self->{"${_}_bind"}) || [] } } (qw/pre_select select from where group having order limit/); |
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221 | } |
222 | |
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223 | my $for_syntax = { |
224 | update => 'FOR UPDATE', |
225 | shared => 'FOR SHARE', |
226 | }; |
227 | sub _lock_select { |
228 | my ($self, $type) = @_; |
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229 | |
230 | my $sql; |
231 | if (ref($type) eq 'SCALAR') { |
232 | $sql = "FOR $$type"; |
233 | } |
234 | else { |
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235 | $sql = $for_syntax->{$type} || $self->throw_exception( "Unknown SELECT .. FO |
236 | R type '$type' requested" ); |
8249c09b |
237 | } |
238 | |
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239 | return " $sql"; |
240 | } |
241 | |
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242 | sub _recurse_from { |
243 | scalar shift->_render_sqla(table => \@_); |
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244 | } |
245 | |
10cef607 |
246 | 1; |
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247 | |
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248 | =head1 OPERATORS |
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249 | |
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250 | =head2 -ident |
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251 | |
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252 | Used to explicitly specify an SQL identifier. Takes a plain string as value |
253 | which is then invariably treated as a column name (and is being properly |
254 | quoted if quoting has been requested). Most useful for comparison of two |
255 | columns: |
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256 | |
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257 | my %where = ( |
258 | priority => { '<', 2 }, |
259 | requestor => { -ident => 'submitter' } |
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260 | ); |
261 | |
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262 | which results in: |
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263 | |
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264 | $stmt = 'WHERE "priority" < ? AND "requestor" = "submitter"'; |
265 | @bind = ('2'); |
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266 | |
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267 | =head2 -value |
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268 | |
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269 | The -value operator signals that the argument to the right is a raw bind value. |
270 | It will be passed straight to DBI, without invoking any of the SQL::Abstract |
271 | condition-parsing logic. This allows you to, for example, pass an array as a |
272 | column value for databases that support array datatypes, e.g.: |
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273 | |
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274 | my %where = ( |
275 | array => { -value => [1, 2, 3] } |
b8391c87 |
276 | ); |
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277 | |
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278 | which results in: |
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279 | |
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280 | $stmt = 'WHERE array = ?'; |
281 | @bind = ([1, 2, 3]); |
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282 | |
283 | =head1 AUTHORS |
284 | |
285 | See L<DBIx::Class/CONTRIBUTORS>. |
286 | |
287 | =head1 LICENSE |
288 | |
289 | You may distribute this code under the same terms as Perl itself. |
290 | |
291 | =cut |