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1 | package DBIx::Class::Storage::DBI::Cursor; |
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2 | |
3 | use base qw/DBIx::Class::Cursor/; |
4 | |
5 | use strict; |
6 | use warnings; |
7 | |
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8 | =head1 NAME |
9 | |
10 | DBIx::Class::Storage::DBI::Cursor - Object representing a query cursor on a |
11 | resultset. |
12 | |
13 | =head1 SYNOPSIS |
14 | |
15 | my $cursor = $schema->resultset('CD')->cursor(); |
16 | my $first_cd = $cursor->next; |
17 | |
18 | =head1 DESCRIPTION |
19 | |
20 | A Cursor represents a query cursor on a L<DBIx::Class::ResultSet> object. It |
21 | allows for traversing the result set with L</next>, retrieving all results with |
22 | L</all> and resetting the cursor with L</reset>. |
23 | |
24 | Usually, you would use the cursor methods built into L<DBIx::Class::ResultSet> |
25 | to traverse it. See L<DBIx::Class::ResultSet/next>, |
26 | L<DBIx::Class::ResultSet/reset> and L<DBIx::Class::ResultSet/all> for more |
27 | information. |
28 | |
29 | =head1 METHODS |
30 | |
31 | =head2 new |
32 | |
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33 | Returns a new L<DBIx::Class::Storage::DBI::Cursor> object. |
34 | |
35 | =cut |
36 | |
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37 | sub new { |
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38 | my ($class, $storage, $args, $attrs) = @_; |
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39 | #use Data::Dumper; warn Dumper(@_); |
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40 | $class = ref $class if ref $class; |
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41 | my $new = { |
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42 | storage => $storage, |
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43 | args => $args, |
44 | pos => 0, |
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45 | attrs => $attrs, |
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46 | _dbh_gen => $storage->{_dbh_gen}, |
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47 | }; |
48 | |
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49 | return bless ($new, $class); |
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50 | } |
51 | |
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52 | =head2 next |
53 | |
21b5c39d |
54 | =over 4 |
55 | |
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56 | =item Arguments: none |
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57 | |
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58 | =item Return Value: \@row_columns |
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59 | |
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60 | =back |
61 | |
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62 | Advances the cursor to the next row and returns an arrayref of column values. |
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63 | |
64 | =cut |
65 | |
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66 | sub _dbh_next { |
67 | my ($storage, $dbh, $self) = @_; |
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68 | |
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69 | $self->_check_dbh_gen; |
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70 | if ($self->{attrs}{rows} && $self->{pos} >= $self->{attrs}{rows}) { |
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71 | $self->{sth}->finish if $self->{sth}->{Active}; |
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72 | delete $self->{sth}; |
73 | $self->{done} = 1; |
74 | } |
75 | return if $self->{done}; |
76 | unless ($self->{sth}) { |
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77 | $self->{sth} = ($storage->_select(@{$self->{args}}))[1]; |
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78 | if ($self->{attrs}{software_limit}) { |
79 | if (my $offset = $self->{attrs}{offset}) { |
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80 | $self->{sth}->fetch for 1 .. $offset; |
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81 | } |
82 | } |
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83 | } |
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84 | my @row = $self->{sth}->fetchrow_array; |
85 | if (@row) { |
86 | $self->{pos}++; |
87 | } else { |
88 | delete $self->{sth}; |
89 | $self->{done} = 1; |
90 | } |
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91 | return @row; |
92 | } |
93 | |
dbaee748 |
94 | sub next { |
95 | my ($self) = @_; |
96 | $self->{storage}->dbh_do($self->can('_dbh_next'), $self); |
97 | } |
98 | |
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99 | =head2 all |
100 | |
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101 | =over 4 |
102 | |
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103 | =item Arguments: none |
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104 | |
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105 | =item Return Value: \@row_columns+ |
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106 | |
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107 | =back |
108 | |
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109 | Returns a list of arrayrefs of column values for all rows in the |
110 | L<DBIx::Class::ResultSet>. |
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111 | |
112 | =cut |
113 | |
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114 | sub _dbh_all { |
115 | my ($storage, $dbh, $self) = @_; |
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116 | |
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117 | $self->_check_dbh_gen; |
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118 | $self->{sth}->finish if $self->{sth}->{Active}; |
119 | delete $self->{sth}; |
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120 | my ($rv, $sth) = $storage->_select(@{$self->{args}}); |
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121 | return @{$sth->fetchall_arrayref}; |
122 | } |
123 | |
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124 | sub all { |
125 | my ($self) = @_; |
126 | return $self->SUPER::all if $self->{attrs}{rows}; |
127 | $self->{storage}->dbh_do($self->can('_dbh_all'), $self); |
128 | } |
129 | |
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130 | =head2 reset |
131 | |
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132 | Resets the cursor to the beginning of the L<DBIx::Class::ResultSet>. |
133 | |
134 | =cut |
135 | |
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136 | sub reset { |
137 | my ($self) = @_; |
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138 | |
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139 | # No need to care about failures here |
140 | eval { $self->{sth}->finish if $self->{sth} && $self->{sth}->{Active} }; |
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141 | $self->_soft_reset; |
142 | } |
143 | |
144 | sub _soft_reset { |
145 | my ($self) = @_; |
146 | |
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147 | delete $self->{sth}; |
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148 | delete $self->{done}; |
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149 | $self->{pos} = 0; |
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150 | return $self; |
151 | } |
152 | |
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153 | sub _check_dbh_gen { |
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154 | my ($self) = @_; |
155 | |
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156 | if($self->{_dbh_gen} != $self->{storage}->{_dbh_gen}) { |
157 | $self->{_dbh_gen} = $self->{storage}->{_dbh_gen}; |
158 | $self->_soft_reset; |
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159 | } |
160 | } |
161 | |
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162 | sub DESTROY { |
163 | my ($self) = @_; |
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164 | |
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165 | # None of the reasons this would die matter if we're in DESTROY anyways |
166 | eval { $self->{sth}->finish if $self->{sth} && $self->{sth}->{Active} }; |
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167 | } |
168 | |
169 | 1; |