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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'; |
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10 | use namespace::clean; |
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11 | |
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12 | __PACKAGE__->mk_group_accessors(simple => qw/ |
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13 | _identity _identity_method _pre_insert_sql _post_insert_sql |
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14 | /); |
15 | |
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16 | __PACKAGE__->sql_maker_class('DBIx::Class::SQLMaker::MSSQL'); |
ac93965c |
17 | |
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18 | __PACKAGE__->sql_quote_char([qw/[ ]/]); |
19 | |
6f7a118e |
20 | __PACKAGE__->datetime_parser_type ( |
21 | 'DBIx::Class::Storage::DBI::MSSQL::DateTime::Format' |
22 | ); |
23 | |
24 | |
40d8d018 |
25 | __PACKAGE__->new_guid('NEWID()'); |
26 | |
afcfff01 |
27 | sub _set_identity_insert { |
28 | my ($self, $table) = @_; |
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29 | |
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30 | my $stmt = 'SET IDENTITY_INSERT %s %s'; |
31 | $table = $self->sql_maker->_quote($table); |
aac1a358 |
32 | |
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33 | $self->_pre_insert_sql (sprintf $stmt, $table, 'ON'); |
34 | $self->_post_insert_sql(sprintf $stmt, $table, 'OFF'); |
aac1a358 |
35 | } |
36 | |
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37 | sub insert_bulk { |
38 | my $self = shift; |
39 | my ($source, $cols, $data) = @_; |
40 | |
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41 | my $is_identity_insert = |
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42 | (first { $_->{is_auto_increment} } values %{ $source->columns_info($cols) } ) |
43 | ? 1 |
44 | : 0 |
45 | ; |
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46 | |
aac1a358 |
47 | if ($is_identity_insert) { |
48 | $self->_set_identity_insert ($source->name); |
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49 | } |
50 | |
51 | $self->next::method(@_); |
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52 | } |
53 | |
ca791b95 |
54 | sub insert { |
55 | my $self = shift; |
56 | my ($source, $to_insert) = @_; |
57 | |
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58 | my $supplied_col_info = $self->_resolve_column_info($source, [keys %$to_insert] ); |
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59 | |
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60 | my $is_identity_insert = |
61 | (first { $_->{is_auto_increment} } values %$supplied_col_info) ? 1 : 0; |
aac1a358 |
62 | |
63 | if ($is_identity_insert) { |
64 | $self->_set_identity_insert ($source->name); |
afcfff01 |
65 | } |
66 | |
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67 | my $updated_cols = $self->next::method(@_); |
ca791b95 |
68 | |
69 | return $updated_cols; |
70 | } |
71 | |
5a77aa8b |
72 | sub _prep_for_execute { |
73 | my $self = shift; |
0e773352 |
74 | my ($op, $ident, $args) = @_; |
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75 | |
76 | # cast MONEY values properly |
77 | if ($op eq 'insert' || $op eq 'update') { |
78 | my $fields = $args->[0]; |
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79 | |
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80 | my $colinfo = $ident->columns_info([keys %$fields]); |
81 | |
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82 | for my $col (keys %$fields) { |
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83 | # $ident is a result source object with INSERT/UPDATE ops |
52416317 |
84 | if ( |
85 | $colinfo->{$col}{data_type} |
86 | && |
87 | $colinfo->{$col}{data_type} =~ /^money\z/i |
88 | ) { |
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89 | my $val = $fields->{$col}; |
90 | $fields->{$col} = \['CAST(? AS MONEY)', [ $col => $val ]]; |
91 | } |
92 | } |
93 | } |
94 | |
95 | my ($sql, $bind) = $self->next::method (@_); |
96 | |
97 | if ($op eq 'insert') { |
384b8bce |
98 | if (my $prepend = $self->_pre_insert_sql) { |
99 | $sql = "${prepend}\n${sql}"; |
100 | $self->_pre_insert_sql(undef); |
101 | } |
102 | if (my $append = $self->_post_insert_sql) { |
103 | $sql = "${sql}\n${append}"; |
104 | $self->_post_insert_sql(undef); |
105 | } |
106 | $sql .= "\nSELECT SCOPE_IDENTITY()"; |
5a77aa8b |
107 | } |
108 | |
109 | return ($sql, $bind); |
110 | } |
111 | |
112 | sub _execute { |
113 | my $self = shift; |
114 | my ($op) = @_; |
115 | |
0e773352 |
116 | my ($rv, $sth, @bind) = $self->next::method(@_); |
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117 | |
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118 | if ($op eq 'insert') { |
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119 | |
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120 | # this should bring back the result of SELECT SCOPE_IDENTITY() we tacked |
121 | # on in _prep_for_execute above |
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122 | my ($identity) = try { $sth->fetchrow_array }; |
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123 | |
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124 | # SCOPE_IDENTITY failed, but we can do something else |
125 | if ( (! $identity) && $self->_identity_method) { |
126 | ($identity) = $self->_dbh->selectrow_array( |
127 | 'select ' . $self->_identity_method |
128 | ); |
129 | } |
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130 | |
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131 | $self->_identity($identity); |
132 | $sth->finish; |
7b1b2582 |
133 | } |
134 | |
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135 | return wantarray ? ($rv, $sth, @bind) : $rv; |
7b1b2582 |
136 | } |
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137 | |
7b1b2582 |
138 | sub last_insert_id { shift->_identity } |
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139 | |
f0bd60fc |
140 | # |
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141 | # MSSQL is retarded wrt ordered subselects. One needs to add a TOP |
6a247f33 |
142 | # to *all* subqueries, but one also *can't* use TOP 100 PERCENT |
e74c68ce |
143 | # http://sqladvice.com/forums/permalink/18496/22931/ShowThread.aspx#22931 |
f0bd60fc |
144 | # |
145 | sub _select_args_to_query { |
146 | my $self = shift; |
147 | |
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148 | my ($sql, $prep_bind, @rest) = $self->next::method (@_); |
f0bd60fc |
149 | |
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150 | # see if this is an ordered subquery |
151 | my $attrs = $_[3]; |
aca481d8 |
152 | if ( |
153 | $sql !~ /^ \s* SELECT \s+ TOP \s+ \d+ \s+ /xi |
154 | && |
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155 | scalar $self->_extract_order_criteria ($attrs->{order_by}) |
aca481d8 |
156 | ) { |
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157 | $self->throw_exception( |
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158 | 'An ordered subselect encountered - this is not safe! Please see "Ordered Subselects" in DBIx::Class::Storage::DBI::MSSQL |
69a8b315 |
159 | ') unless $attrs->{unsafe_subselect_ok}; |
e9657379 |
160 | my $max = $self->sql_maker->__max_int; |
e74c68ce |
161 | $sql =~ s/^ \s* SELECT \s/SELECT TOP $max /xi; |
f0bd60fc |
162 | } |
163 | |
f0bd60fc |
164 | return wantarray |
17555a0c |
165 | ? ($sql, $prep_bind, @rest) |
166 | : \[ "($sql)", @$prep_bind ] |
f0bd60fc |
167 | ; |
168 | } |
169 | |
170 | |
4c0f4206 |
171 | # savepoint syntax is the same as in Sybase ASE |
172 | |
173 | sub _svp_begin { |
174 | my ($self, $name) = @_; |
175 | |
9ae966b9 |
176 | $self->_get_dbh->do("SAVE TRANSACTION $name"); |
4c0f4206 |
177 | } |
178 | |
179 | # A new SAVE TRANSACTION with the same name releases the previous one. |
180 | sub _svp_release { 1 } |
181 | |
182 | sub _svp_rollback { |
183 | my ($self, $name) = @_; |
184 | |
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185 | $self->_get_dbh->do("ROLLBACK TRANSACTION $name"); |
4c0f4206 |
186 | } |
187 | |
eb0323df |
188 | sub sqlt_type { 'SQLServer' } |
189 | |
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190 | sub sql_limit_dialect { |
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191 | my $self = shift; |
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192 | |
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193 | my $supports_rno = 0; |
ff153e24 |
194 | |
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195 | if (exists $self->_server_info->{normalized_dbms_version}) { |
196 | $supports_rno = 1 if $self->_server_info->{normalized_dbms_version} >= 9; |
197 | } |
198 | else { |
199 | # User is connecting via DBD::Sybase and has no permission to run |
200 | # stored procedures like xp_msver, or version detection failed for some |
201 | # other reason. |
202 | # So, we use a query to check if RNO is implemented. |
203 | try { |
204 | $self->_get_dbh->selectrow_array('SELECT row_number() OVER (ORDER BY rand())'); |
205 | $supports_rno = 1; |
206 | }; |
50772633 |
207 | } |
e76e7b5c |
208 | |
6a247f33 |
209 | return $supports_rno ? 'RowNumberOver' : 'Top'; |
ed8de058 |
210 | } |
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211 | |
ecdf1ac8 |
212 | sub _ping { |
213 | my $self = shift; |
214 | |
215 | my $dbh = $self->_dbh or return 0; |
216 | |
217 | local $dbh->{RaiseError} = 1; |
218 | local $dbh->{PrintError} = 0; |
219 | |
52b420dd |
220 | return try { |
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221 | $dbh->do('select 1'); |
52b420dd |
222 | 1; |
ed7ab0f4 |
223 | } catch { |
52b420dd |
224 | 0; |
ecdf1ac8 |
225 | }; |
ecdf1ac8 |
226 | } |
227 | |
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228 | package # hide from PAUSE |
229 | DBIx::Class::Storage::DBI::MSSQL::DateTime::Format; |
230 | |
fd323bf1 |
231 | my $datetime_format = '%Y-%m-%d %H:%M:%S.%3N'; # %F %T |
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232 | my $smalldatetime_format = '%Y-%m-%d %H:%M:%S'; |
233 | |
234 | my ($datetime_parser, $smalldatetime_parser); |
235 | |
236 | sub parse_datetime { |
237 | shift; |
238 | require DateTime::Format::Strptime; |
239 | $datetime_parser ||= DateTime::Format::Strptime->new( |
240 | pattern => $datetime_format, |
241 | on_error => 'croak', |
242 | ); |
243 | return $datetime_parser->parse_datetime(shift); |
244 | } |
245 | |
246 | sub format_datetime { |
247 | shift; |
248 | require DateTime::Format::Strptime; |
249 | $datetime_parser ||= DateTime::Format::Strptime->new( |
250 | pattern => $datetime_format, |
251 | on_error => 'croak', |
252 | ); |
253 | return $datetime_parser->format_datetime(shift); |
254 | } |
255 | |
256 | sub parse_smalldatetime { |
257 | shift; |
258 | require DateTime::Format::Strptime; |
259 | $smalldatetime_parser ||= DateTime::Format::Strptime->new( |
260 | pattern => $smalldatetime_format, |
261 | on_error => 'croak', |
262 | ); |
263 | return $smalldatetime_parser->parse_datetime(shift); |
264 | } |
265 | |
266 | sub format_smalldatetime { |
267 | shift; |
268 | require DateTime::Format::Strptime; |
269 | $smalldatetime_parser ||= DateTime::Format::Strptime->new( |
270 | pattern => $smalldatetime_format, |
271 | on_error => 'croak', |
272 | ); |
273 | return $smalldatetime_parser->format_datetime(shift); |
274 | } |
275 | |
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276 | 1; |
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277 | |
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278 | =head1 NAME |
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279 | |
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280 | DBIx::Class::Storage::DBI::MSSQL - Base Class for Microsoft SQL Server support |
281 | in DBIx::Class |
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282 | |
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283 | =head1 SYNOPSIS |
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284 | |
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285 | This is the base class for Microsoft SQL Server support, used by |
286 | L<DBIx::Class::Storage::DBI::ODBC::Microsoft_SQL_Server> and |
287 | L<DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server>. |
eb0323df |
288 | |
5a77aa8b |
289 | =head1 IMPLEMENTATION NOTES |
eb0323df |
290 | |
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291 | =head2 IDENTITY information |
292 | |
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293 | Microsoft SQL Server supports three methods of retrieving the IDENTITY |
294 | value for inserted row: IDENT_CURRENT, @@IDENTITY, and SCOPE_IDENTITY(). |
295 | SCOPE_IDENTITY is used here because it is the safest. However, it must |
296 | be called is the same execute statement, not just the same connection. |
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297 | |
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298 | So, this implementation appends a SELECT SCOPE_IDENTITY() statement |
299 | onto each INSERT to accommodate that requirement. |
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300 | |
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301 | C<SELECT @@IDENTITY> can also be used by issuing: |
302 | |
303 | $self->_identity_method('@@identity'); |
304 | |
08cdc412 |
305 | it will only be used if SCOPE_IDENTITY() fails. |
306 | |
307 | This is more dangerous, as inserting into a table with an on insert trigger that |
308 | inserts into another table with an identity will give erroneous results on |
309 | recent versions of SQL Server. |
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310 | |
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311 | =head2 identity insert |
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312 | |
313 | Be aware that we have tried to make things as simple as possible for our users. |
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314 | For MSSQL that means that when a user tries to create a row, while supplying an |
315 | explicit value for an autoincrementing column, we will try to issue the |
316 | appropriate database call to make this possible, namely C<SET IDENTITY_INSERT |
317 | $table_name ON>. Unfortunately this operation in MSSQL requires the |
318 | C<db_ddladmin> privilege, which is normally not included in the standard |
319 | write-permissions. |
fd05d10a |
320 | |
d74f2da9 |
321 | =head2 Ordered Subselects |
6de07ea3 |
322 | |
d74f2da9 |
323 | If you attempted the following query (among many others) in Microsoft SQL |
324 | Server |
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325 | |
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326 | $rs->search ({}, { |
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327 | prefetch => 'relation', |
328 | rows => 2, |
329 | offset => 3, |
330 | }); |
331 | |
d74f2da9 |
332 | You may be surprised to receive an exception. The reason for this is a quirk |
333 | in the MSSQL engine itself, and sadly doesn't have a sensible workaround due |
334 | to the way DBIC is built. DBIC can do truly wonderful things with the aid of |
335 | subselects, and does so automatically when necessary. The list of situations |
336 | when a subselect is necessary is long and still changes often, so it can not |
337 | be exhaustively enumerated here. The general rule of thumb is a joined |
338 | L<has_many|DBIx::Class::Relationship/has_many> relationship with limit/group |
339 | applied to the left part of the join. |
340 | |
341 | In its "pursuit of standards" Microsft SQL Server goes to great lengths to |
342 | forbid the use of ordered subselects. This breaks a very useful group of |
343 | searches like "Give me things number 4 to 6 (ordered by name), and prefetch |
344 | all their relations, no matter how many". While there is a hack which fools |
345 | the syntax checker, the optimizer may B<still elect to break the subselect>. |
346 | Testing has determined that while such breakage does occur (the test suite |
347 | contains an explicit test which demonstrates the problem), it is relative |
348 | rare. The benefits of ordered subselects are on the other hand too great to be |
349 | outright disabled for MSSQL. |
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350 | |
351 | Thus compromise between usability and perfection is the MSSQL-specific |
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352 | L<resultset attribute|DBIx::Class::ResultSet/ATTRIBUTES> C<unsafe_subselect_ok>. |
6de07ea3 |
353 | It is deliberately not possible to set this on the Storage level, as the user |
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354 | should inspect (and preferably regression-test) the return of every such |
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355 | ResultSet individually. The example above would work if written like: |
356 | |
357 | $rs->search ({}, { |
69a8b315 |
358 | unsafe_subselect_ok => 1, |
d74f2da9 |
359 | prefetch => 'relation', |
360 | rows => 2, |
361 | offset => 3, |
362 | }); |
6de07ea3 |
363 | |
364 | If it is possible to rewrite the search() in a way that will avoid the need |
365 | for this flag - you are urged to do so. If DBIC internals insist that an |
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366 | ordered subselect is necessary for an operation, and you believe there is a |
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367 | different/better way to get the same result - please file a bugreport. |
6de07ea3 |
368 | |
5a77aa8b |
369 | =head1 AUTHOR |
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370 | |
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371 | See L<DBIx::Class/AUTHOR> and L<DBIx::Class/CONTRIBUTORS>. |
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372 | |
75d07914 |
373 | =head1 LICENSE |
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374 | |
75d07914 |
375 | You may distribute this code under the same terms as Perl itself. |
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376 | |
75d07914 |
377 | =cut |