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1 | package DBIx::Class::Storage::DBI::MSSQL; |
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2 | |
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3 | use strict; |
4 | use warnings; |
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5 | |
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6 | use base qw/DBIx::Class::Storage::DBI::UniqueIdentifier/; |
2ad62d97 |
7 | use mro 'c3'; |
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8 | use Try::Tiny; |
6298a324 |
9 | use List::Util 'first'; |
fd323bf1 |
10 | use namespace::clean; |
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11 | |
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12 | __PACKAGE__->mk_group_accessors(simple => qw/ |
13 | _identity _identity_method |
14 | /); |
15 | |
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16 | __PACKAGE__->sql_maker_class('DBIx::Class::SQLMaker::MSSQL'); |
ac93965c |
17 | |
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18 | sub _set_identity_insert { |
19 | my ($self, $table) = @_; |
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20 | |
21 | my $sql = sprintf ( |
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22 | 'SET IDENTITY_INSERT %s ON', |
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23 | $self->sql_maker->_quote ($table), |
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24 | ); |
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25 | |
26 | my $dbh = $self->_get_dbh; |
ed7ab0f4 |
27 | try { $dbh->do ($sql) } |
28 | catch { |
64690266 |
29 | $self->throw_exception (sprintf "Error executing '%s': %s", |
30 | $sql, |
31 | $dbh->errstr, |
32 | ); |
ed7ab0f4 |
33 | }; |
afcfff01 |
34 | } |
35 | |
aac1a358 |
36 | sub _unset_identity_insert { |
37 | my ($self, $table) = @_; |
38 | |
39 | my $sql = sprintf ( |
40 | 'SET IDENTITY_INSERT %s OFF', |
41 | $self->sql_maker->_quote ($table), |
42 | ); |
43 | |
44 | my $dbh = $self->_get_dbh; |
45 | $dbh->do ($sql); |
46 | } |
47 | |
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48 | sub insert_bulk { |
49 | my $self = shift; |
50 | my ($source, $cols, $data) = @_; |
51 | |
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52 | my $is_identity_insert = |
53 | (first { $source->column_info ($_)->{is_auto_increment} } @{$cols}) ? 1 : 0; |
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54 | |
aac1a358 |
55 | if ($is_identity_insert) { |
56 | $self->_set_identity_insert ($source->name); |
5a77aa8b |
57 | } |
58 | |
59 | $self->next::method(@_); |
60 | |
aac1a358 |
61 | if ($is_identity_insert) { |
62 | $self->_unset_identity_insert ($source->name); |
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63 | } |
64 | } |
65 | |
ca791b95 |
66 | sub insert { |
67 | my $self = shift; |
68 | my ($source, $to_insert) = @_; |
69 | |
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70 | my $supplied_col_info = $self->_resolve_column_info($source, [keys %$to_insert] ); |
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71 | |
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72 | my $is_identity_insert = |
73 | (first { $_->{is_auto_increment} } values %$supplied_col_info) ? 1 : 0; |
aac1a358 |
74 | |
75 | if ($is_identity_insert) { |
76 | $self->_set_identity_insert ($source->name); |
afcfff01 |
77 | } |
78 | |
548d1627 |
79 | my $updated_cols = $self->next::method(@_); |
ca791b95 |
80 | |
aac1a358 |
81 | if ($is_identity_insert) { |
82 | $self->_unset_identity_insert ($source->name); |
83 | } |
84 | |
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85 | return $updated_cols; |
86 | } |
87 | |
5a77aa8b |
88 | sub _prep_for_execute { |
89 | my $self = shift; |
90 | my ($op, $extra_bind, $ident, $args) = @_; |
91 | |
92 | # cast MONEY values properly |
93 | if ($op eq 'insert' || $op eq 'update') { |
94 | my $fields = $args->[0]; |
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95 | |
96 | for my $col (keys %$fields) { |
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97 | # $ident is a result source object with INSERT/UPDATE ops |
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98 | if ($ident->column_info ($col)->{data_type} |
99 | && |
100 | $ident->column_info ($col)->{data_type} =~ /^money\z/i) { |
5a77aa8b |
101 | my $val = $fields->{$col}; |
102 | $fields->{$col} = \['CAST(? AS MONEY)', [ $col => $val ]]; |
103 | } |
104 | } |
105 | } |
106 | |
107 | my ($sql, $bind) = $self->next::method (@_); |
108 | |
109 | if ($op eq 'insert') { |
110 | $sql .= ';SELECT SCOPE_IDENTITY()'; |
111 | |
5a77aa8b |
112 | } |
113 | |
114 | return ($sql, $bind); |
115 | } |
116 | |
117 | sub _execute { |
118 | my $self = shift; |
119 | my ($op) = @_; |
120 | |
121 | my ($rv, $sth, @bind) = $self->dbh_do($self->can('_dbh_execute'), @_); |
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122 | |
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123 | if ($op eq 'insert') { |
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124 | |
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125 | # this should bring back the result of SELECT SCOPE_IDENTITY() we tacked |
126 | # on in _prep_for_execute above |
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127 | my ($identity) = try { $sth->fetchrow_array }; |
ed8de058 |
128 | |
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129 | # SCOPE_IDENTITY failed, but we can do something else |
130 | if ( (! $identity) && $self->_identity_method) { |
131 | ($identity) = $self->_dbh->selectrow_array( |
132 | 'select ' . $self->_identity_method |
133 | ); |
134 | } |
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135 | |
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136 | $self->_identity($identity); |
137 | $sth->finish; |
7b1b2582 |
138 | } |
139 | |
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140 | return wantarray ? ($rv, $sth, @bind) : $rv; |
7b1b2582 |
141 | } |
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142 | |
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143 | sub last_insert_id { shift->_identity } |
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144 | |
f0bd60fc |
145 | # |
e74c68ce |
146 | # MSSQL is retarded wrt ordered subselects. One needs to add a TOP |
6a247f33 |
147 | # to *all* subqueries, but one also *can't* use TOP 100 PERCENT |
e74c68ce |
148 | # http://sqladvice.com/forums/permalink/18496/22931/ShowThread.aspx#22931 |
f0bd60fc |
149 | # |
150 | sub _select_args_to_query { |
151 | my $self = shift; |
152 | |
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153 | my ($sql, $prep_bind, @rest) = $self->next::method (@_); |
f0bd60fc |
154 | |
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155 | # see if this is an ordered subquery |
156 | my $attrs = $_[3]; |
aca481d8 |
157 | if ( |
158 | $sql !~ /^ \s* SELECT \s+ TOP \s+ \d+ \s+ /xi |
159 | && |
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160 | scalar $self->_parse_order_by ($attrs->{order_by}) |
aca481d8 |
161 | ) { |
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162 | $self->throw_exception( |
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163 | 'An ordered subselect encountered - this is not safe! Please see "Ordered Subselects" in DBIx::Class::Storage::DBI::MSSQL |
69a8b315 |
164 | ') unless $attrs->{unsafe_subselect_ok}; |
e9657379 |
165 | my $max = $self->sql_maker->__max_int; |
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166 | $sql =~ s/^ \s* SELECT \s/SELECT TOP $max /xi; |
f0bd60fc |
167 | } |
168 | |
f0bd60fc |
169 | return wantarray |
17555a0c |
170 | ? ($sql, $prep_bind, @rest) |
171 | : \[ "($sql)", @$prep_bind ] |
f0bd60fc |
172 | ; |
173 | } |
174 | |
175 | |
4c0f4206 |
176 | # savepoint syntax is the same as in Sybase ASE |
177 | |
178 | sub _svp_begin { |
179 | my ($self, $name) = @_; |
180 | |
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181 | $self->_get_dbh->do("SAVE TRANSACTION $name"); |
4c0f4206 |
182 | } |
183 | |
184 | # A new SAVE TRANSACTION with the same name releases the previous one. |
185 | sub _svp_release { 1 } |
186 | |
187 | sub _svp_rollback { |
188 | my ($self, $name) = @_; |
189 | |
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190 | $self->_get_dbh->do("ROLLBACK TRANSACTION $name"); |
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191 | } |
192 | |
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193 | sub datetime_parser_type { |
194 | 'DBIx::Class::Storage::DBI::MSSQL::DateTime::Format' |
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195 | } |
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196 | |
197 | sub sqlt_type { 'SQLServer' } |
198 | |
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199 | sub sql_limit_dialect { |
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200 | my $self = shift; |
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201 | |
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202 | my $supports_rno = 0; |
ff153e24 |
203 | |
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204 | if (exists $self->_server_info->{normalized_dbms_version}) { |
205 | $supports_rno = 1 if $self->_server_info->{normalized_dbms_version} >= 9; |
206 | } |
207 | else { |
208 | # User is connecting via DBD::Sybase and has no permission to run |
209 | # stored procedures like xp_msver, or version detection failed for some |
210 | # other reason. |
211 | # So, we use a query to check if RNO is implemented. |
212 | try { |
213 | $self->_get_dbh->selectrow_array('SELECT row_number() OVER (ORDER BY rand())'); |
214 | $supports_rno = 1; |
215 | }; |
50772633 |
216 | } |
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217 | |
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218 | return $supports_rno ? 'RowNumberOver' : 'Top'; |
ed8de058 |
219 | } |
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220 | |
ecdf1ac8 |
221 | sub _ping { |
222 | my $self = shift; |
223 | |
224 | my $dbh = $self->_dbh or return 0; |
225 | |
226 | local $dbh->{RaiseError} = 1; |
227 | local $dbh->{PrintError} = 0; |
228 | |
52b420dd |
229 | return try { |
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230 | $dbh->do('select 1'); |
52b420dd |
231 | 1; |
ed7ab0f4 |
232 | } catch { |
52b420dd |
233 | 0; |
ecdf1ac8 |
234 | }; |
ecdf1ac8 |
235 | } |
236 | |
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237 | package # hide from PAUSE |
238 | DBIx::Class::Storage::DBI::MSSQL::DateTime::Format; |
239 | |
fd323bf1 |
240 | my $datetime_format = '%Y-%m-%d %H:%M:%S.%3N'; # %F %T |
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241 | my $smalldatetime_format = '%Y-%m-%d %H:%M:%S'; |
242 | |
243 | my ($datetime_parser, $smalldatetime_parser); |
244 | |
245 | sub parse_datetime { |
246 | shift; |
247 | require DateTime::Format::Strptime; |
248 | $datetime_parser ||= DateTime::Format::Strptime->new( |
249 | pattern => $datetime_format, |
250 | on_error => 'croak', |
251 | ); |
252 | return $datetime_parser->parse_datetime(shift); |
253 | } |
254 | |
255 | sub format_datetime { |
256 | shift; |
257 | require DateTime::Format::Strptime; |
258 | $datetime_parser ||= DateTime::Format::Strptime->new( |
259 | pattern => $datetime_format, |
260 | on_error => 'croak', |
261 | ); |
262 | return $datetime_parser->format_datetime(shift); |
263 | } |
264 | |
265 | sub parse_smalldatetime { |
266 | shift; |
267 | require DateTime::Format::Strptime; |
268 | $smalldatetime_parser ||= DateTime::Format::Strptime->new( |
269 | pattern => $smalldatetime_format, |
270 | on_error => 'croak', |
271 | ); |
272 | return $smalldatetime_parser->parse_datetime(shift); |
273 | } |
274 | |
275 | sub format_smalldatetime { |
276 | shift; |
277 | require DateTime::Format::Strptime; |
278 | $smalldatetime_parser ||= DateTime::Format::Strptime->new( |
279 | pattern => $smalldatetime_format, |
280 | on_error => 'croak', |
281 | ); |
282 | return $smalldatetime_parser->format_datetime(shift); |
283 | } |
284 | |
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285 | 1; |
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286 | |
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287 | =head1 NAME |
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288 | |
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289 | DBIx::Class::Storage::DBI::MSSQL - Base Class for Microsoft SQL Server support |
290 | in DBIx::Class |
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291 | |
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292 | =head1 SYNOPSIS |
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293 | |
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294 | This is the base class for Microsoft SQL Server support, used by |
295 | L<DBIx::Class::Storage::DBI::ODBC::Microsoft_SQL_Server> and |
296 | L<DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server>. |
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297 | |
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298 | =head1 IMPLEMENTATION NOTES |
eb0323df |
299 | |
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300 | =head2 IDENTITY information |
301 | |
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302 | Microsoft SQL Server supports three methods of retrieving the IDENTITY |
303 | value for inserted row: IDENT_CURRENT, @@IDENTITY, and SCOPE_IDENTITY(). |
304 | SCOPE_IDENTITY is used here because it is the safest. However, it must |
305 | be called is the same execute statement, not just the same connection. |
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306 | |
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307 | So, this implementation appends a SELECT SCOPE_IDENTITY() statement |
308 | onto each INSERT to accommodate that requirement. |
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309 | |
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310 | C<SELECT @@IDENTITY> can also be used by issuing: |
311 | |
312 | $self->_identity_method('@@identity'); |
313 | |
08cdc412 |
314 | it will only be used if SCOPE_IDENTITY() fails. |
315 | |
316 | This is more dangerous, as inserting into a table with an on insert trigger that |
317 | inserts into another table with an identity will give erroneous results on |
318 | recent versions of SQL Server. |
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319 | |
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320 | =head2 identity insert |
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321 | |
322 | Be aware that we have tried to make things as simple as possible for our users. |
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323 | For MSSQL that means that when a user tries to create a row, while supplying an |
324 | explicit value for an autoincrementing column, we will try to issue the |
325 | appropriate database call to make this possible, namely C<SET IDENTITY_INSERT |
326 | $table_name ON>. Unfortunately this operation in MSSQL requires the |
327 | C<db_ddladmin> privilege, which is normally not included in the standard |
328 | write-permissions. |
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329 | |
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330 | =head2 Ordered Subselects |
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331 | |
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332 | If you attempted the following query (among many others) in Microsoft SQL |
333 | Server |
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334 | |
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335 | $rs->search ({}, { |
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336 | prefetch => 'relation', |
337 | rows => 2, |
338 | offset => 3, |
339 | }); |
340 | |
d74f2da9 |
341 | You may be surprised to receive an exception. The reason for this is a quirk |
342 | in the MSSQL engine itself, and sadly doesn't have a sensible workaround due |
343 | to the way DBIC is built. DBIC can do truly wonderful things with the aid of |
344 | subselects, and does so automatically when necessary. The list of situations |
345 | when a subselect is necessary is long and still changes often, so it can not |
346 | be exhaustively enumerated here. The general rule of thumb is a joined |
347 | L<has_many|DBIx::Class::Relationship/has_many> relationship with limit/group |
348 | applied to the left part of the join. |
349 | |
350 | In its "pursuit of standards" Microsft SQL Server goes to great lengths to |
351 | forbid the use of ordered subselects. This breaks a very useful group of |
352 | searches like "Give me things number 4 to 6 (ordered by name), and prefetch |
353 | all their relations, no matter how many". While there is a hack which fools |
354 | the syntax checker, the optimizer may B<still elect to break the subselect>. |
355 | Testing has determined that while such breakage does occur (the test suite |
356 | contains an explicit test which demonstrates the problem), it is relative |
357 | rare. The benefits of ordered subselects are on the other hand too great to be |
358 | outright disabled for MSSQL. |
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359 | |
360 | Thus compromise between usability and perfection is the MSSQL-specific |
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361 | L<resultset attribute|DBIx::Class::ResultSet/ATTRIBUTES> C<unsafe_subselect_ok>. |
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362 | It is deliberately not possible to set this on the Storage level, as the user |
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363 | should inspect (and preferably regression-test) the return of every such |
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364 | ResultSet individually. The example above would work if written like: |
365 | |
366 | $rs->search ({}, { |
69a8b315 |
367 | unsafe_subselect_ok => 1, |
d74f2da9 |
368 | prefetch => 'relation', |
369 | rows => 2, |
370 | offset => 3, |
371 | }); |
6de07ea3 |
372 | |
373 | If it is possible to rewrite the search() in a way that will avoid the need |
374 | for this flag - you are urged to do so. If DBIC internals insist that an |
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375 | ordered subselect is necessary for an operation, and you believe there is a |
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376 | different/better way to get the same result - please file a bugreport. |
6de07ea3 |
377 | |
5a77aa8b |
378 | =head1 AUTHOR |
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379 | |
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380 | See L<DBIx::Class/AUTHOR> and L<DBIx::Class/CONTRIBUTORS>. |
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381 | |
75d07914 |
382 | =head1 LICENSE |
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383 | |
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384 | You may distribute this code under the same terms as Perl itself. |
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385 | |
75d07914 |
386 | =cut |