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1 | package DBIx::Class::Row; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
6 | =head1 NAME |
7 | |
8 | DBIx::Class::Row - Basic row methods |
9 | |
10 | =head1 SYNOPSIS |
11 | |
12 | =head1 DESCRIPTION |
13 | |
14 | This class is responsible for defining and doing basic operations on rows |
15 | derived from L<DBIx::Class::Table> objects. |
16 | |
17 | =head1 METHODS |
18 | |
19 | =over 4 |
20 | |
21 | =item new |
22 | |
23 | my $obj = My::Class->new($attrs); |
24 | |
25 | Creates a new row object from column => value mappings passed as a hash ref |
26 | |
27 | =cut |
28 | |
29 | sub new { |
30 | my ($class, $attrs) = @_; |
31 | $class = ref $class if ref $class; |
32 | my $new = bless({ _column_data => { } }, $class); |
33 | if ($attrs) { |
34 | $new->throw("attrs must be a hashref" ) unless ref($attrs) eq 'HASH'; |
35 | while (my ($k, $v) = each %{$attrs}) { |
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36 | die "No such column $k on $class" unless $class->has_column($k); |
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37 | $new->store_column($k => $v); |
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38 | } |
39 | } |
40 | return $new; |
41 | } |
42 | |
43 | =item insert |
44 | |
45 | $obj->insert; |
46 | |
47 | Inserts an object into the database if it isn't already in there. Returns |
48 | the object itself. |
49 | |
50 | =cut |
51 | |
52 | sub insert { |
53 | my ($self) = @_; |
54 | return $self if $self->in_storage; |
55 | #use Data::Dumper; warn Dumper($self); |
56 | my %in; |
57 | $in{$_} = $self->get_column($_) |
58 | for grep { defined $self->get_column($_) } $self->columns; |
59 | my %out = %{ $self->storage->insert($self->_table_name, \%in) }; |
60 | $self->store_column($_, $out{$_}) |
61 | for grep { $self->get_column($_) ne $out{$_} } keys %out; |
62 | $self->in_storage(1); |
63 | $self->{_dirty_columns} = {}; |
64 | return $self; |
65 | } |
66 | |
67 | =item in_storage |
68 | |
69 | $obj->in_storage; # Get value |
70 | $obj->in_storage(1); # Set value |
71 | |
72 | Indicated whether the object exists as a row in the database or not |
73 | |
74 | =cut |
75 | |
76 | sub in_storage { |
77 | my ($self, $val) = @_; |
78 | $self->{_in_storage} = $val if @_ > 1; |
79 | return $self->{_in_storage}; |
80 | } |
81 | |
82 | =item create |
83 | |
84 | my $new = My::Class->create($attrs); |
85 | |
86 | A shortcut for My::Class->new($attrs)->insert; |
87 | |
88 | =cut |
89 | |
90 | sub create { |
91 | my ($class, $attrs) = @_; |
92 | $class->throw( "create needs a hashref" ) unless ref $attrs eq 'HASH'; |
93 | return $class->new($attrs)->insert; |
94 | } |
95 | |
96 | =item update |
97 | |
98 | $obj->update; |
99 | |
100 | Must be run on an object that is already in the database; issues an SQL |
101 | UPDATE query to commit any changes to the object to the db if required. |
102 | |
103 | =cut |
104 | |
105 | sub update { |
106 | my ($self, $upd) = @_; |
107 | $self->throw( "Not in database" ) unless $self->in_storage; |
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108 | if (ref $upd eq 'HASH') { |
109 | $self->$_($upd->{$_}) for keys %$upd; |
110 | } |
111 | my %to_update; |
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112 | $to_update{$_} = $self->get_column($_) for $self->is_changed; |
113 | return -1 unless keys %to_update; |
114 | my $rows = $self->storage->update($self->_table_name, \%to_update, |
115 | $self->ident_condition); |
116 | if ($rows == 0) { |
117 | $self->throw( "Can't update ${self}: row not found" ); |
118 | } elsif ($rows > 1) { |
119 | $self->throw("Can't update ${self}: updated more than one row"); |
120 | } |
121 | $self->{_dirty_columns} = {}; |
122 | return $self; |
123 | } |
124 | |
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125 | =item delete |
126 | |
127 | $obj->delete |
128 | |
129 | Deletes the object from the database. The object is still perfectly usable |
130 | accessor-wise etc. but ->in_storage will now return 0 and the object must |
131 | be re ->insert'ed before it can be ->update'ed |
132 | |
133 | =cut |
134 | |
135 | sub delete { |
136 | my $self = shift; |
137 | if (ref $self) { |
138 | $self->throw( "Not in database" ) unless $self->in_storage; |
139 | #warn $self->_ident_cond.' '.join(', ', $self->_ident_values); |
140 | $self->storage->delete($self->_table_name, $self->ident_condition); |
141 | $self->in_storage(undef); |
142 | #$self->store_column($_ => undef) for $self->primary_columns; |
143 | # Should probably also arrange to trash PK if auto |
144 | # but if we do, post-delete cascade triggers fail :/ |
145 | } else { |
146 | my $attrs = { }; |
147 | if (@_ > 1 && ref $_[$#_] eq 'HASH') { |
148 | $attrs = { %{ pop(@_) } }; |
149 | } |
150 | my $query = (ref $_[0] eq 'HASH' ? $_[0] : {@_}); |
151 | $self->storage->delete($self->_table_name, $query); |
152 | } |
153 | return $self; |
154 | } |
155 | |
156 | =item get_column |
157 | |
158 | my $val = $obj->get_column($col); |
159 | |
160 | Fetches a column value |
161 | |
162 | =cut |
163 | |
164 | sub get_column { |
165 | my ($self, $column) = @_; |
166 | $self->throw( "Can't fetch data as class method" ) unless ref $self; |
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167 | $self->throw( "No such column '${column}'" ) unless $self->has_column($column); |
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168 | return $self->{_column_data}{$column} |
169 | if exists $self->{_column_data}{$column}; |
170 | return undef; |
171 | } |
172 | |
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173 | =item get_columns |
174 | |
175 | my %data = $obj->get_columns; |
176 | |
177 | Fetch all column values at once. |
178 | |
179 | =cut |
180 | |
181 | sub get_columns { |
182 | my $self = shift; |
183 | return map { $_ => $self->get_column($_) } $self->columns; |
184 | } |
185 | |
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186 | =item set_column |
187 | |
188 | $obj->set_column($col => $val); |
189 | |
190 | Sets a column value; if the new value is different to the old the column |
191 | is marked as dirty for when you next call $obj->update |
192 | |
193 | =cut |
194 | |
195 | sub set_column { |
196 | my $self = shift; |
197 | my ($column) = @_; |
198 | my $old = $self->get_column($column); |
199 | my $ret = $self->store_column(@_); |
200 | $self->{_dirty_columns}{$column} = 1 unless defined $old && $old eq $ret; |
201 | return $ret; |
202 | } |
203 | |
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204 | =item set_columns |
205 | |
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206 | my $copy = $orig->set_columns({ $col => $val, ... }); |
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207 | |
208 | Set more than one column value at once. |
209 | |
210 | =cut |
211 | |
212 | sub set_columns { |
213 | my ($self,$data) = @_; |
214 | while (my ($col,$val) = each %$data) { |
215 | $self->set_column($col,$val); |
216 | } |
217 | } |
218 | |
219 | =item copy |
220 | |
221 | my $copy = $orig->copy({ change => $to, ... }); |
222 | |
223 | Insert a new row with the specified changes. |
224 | |
225 | =cut |
226 | |
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227 | =item store_column |
228 | |
229 | $obj->store_column($col => $val); |
230 | |
231 | Sets a column value without marking it as dirty |
232 | |
233 | =cut |
234 | |
235 | sub store_column { |
236 | my ($self, $column, $value) = @_; |
237 | $self->throw( "No such column '${column}'" ) |
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238 | unless $self->has_column($column); |
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239 | $self->throw( "set_column called for ${column} without value" ) |
240 | if @_ < 3; |
241 | return $self->{_column_data}{$column} = $value; |
242 | } |
243 | |
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244 | sub _row_to_object { |
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245 | my ($class, $cols, $row) = @_; |
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246 | my %vals; |
247 | $vals{$cols->[$_]} = $row->[$_] for 0 .. $#$cols; |
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248 | my $new = bless({ _column_data => \%vals }, ref $class || $class); |
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249 | $new->in_storage(1); |
250 | return $new; |
251 | } |
252 | |
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253 | sub copy { |
254 | my ($self, $changes) = @_; |
255 | my $new = bless({ _column_data => { %{$self->{_column_data}}} }, ref $self); |
256 | $new->set_column($_ => $changes->{$_}) for keys %$changes; |
257 | return $new->insert; |
258 | } |
259 | |
260 | =item insert_or_update |
261 | |
262 | $obj->insert_or_update |
263 | |
264 | Updates the object if it's already in the db, else inserts it |
265 | |
266 | =cut |
267 | |
268 | sub insert_or_update { |
269 | my $self = shift; |
270 | return ($self->in_storage ? $self->update : $self->insert); |
271 | } |
272 | |
273 | =item is_changed |
274 | |
275 | my @changed_col_names = $obj->is_changed |
276 | |
277 | =cut |
278 | |
279 | sub is_changed { |
280 | return keys %{shift->{_dirty_columns} || {}}; |
281 | } |
282 | |
283 | 1; |
284 | |
285 | =back |
286 | |
287 | =head1 AUTHORS |
288 | |
daec44b8 |
289 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
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290 | |
291 | =head1 LICENSE |
292 | |
293 | You may distribute this code under the same terms as Perl itself. |
294 | |
295 | =cut |
296 | |