line |
stmt |
bran |
cond |
sub |
pod |
time |
code |
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4
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use strict; |
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45
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2
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3
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package LittleORM::Db; |
4
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5
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my $cached_read_dbh = []; |
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my $cached_write_dbh = []; |
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8
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1
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1
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3
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use Carp::Assert 'assert'; |
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2
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1
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7
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9
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10
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sub dbh_is_ok |
11
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{ |
12
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0
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0
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0
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my $dbh = shift; |
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14
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0
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my $rv = $dbh; |
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16
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0
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0
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if( $dbh ) |
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{ |
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0
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0
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unless( $dbh -> ping() ) |
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{ |
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0
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$rv = undef; |
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} |
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} |
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24
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0
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return $rv; |
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} |
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27
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sub init |
28
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{ |
29
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0
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0
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0
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my ( $self, $dbh ) = @_; |
30
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31
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0
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0
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unless( $dbh ) |
32
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{ |
33
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# non-object call ? |
34
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0
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$dbh = $self; |
35
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} |
36
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37
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0
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0
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if( ref( $dbh ) eq 'HASH' ) |
38
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{ |
39
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0
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my ( $rdbh, $wdbh ) = @{ $dbh }{ 'read', 'write' }; |
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0
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40
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0
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0
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assert( $rdbh and $wdbh ); |
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42
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0
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0
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$cached_read_dbh = ( ref( $rdbh ) eq 'ARRAY' ? $rdbh : [ $rdbh ] ); |
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0
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0
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$cached_write_dbh = ( ref( $wdbh ) eq 'ARRAY' ? $wdbh : [ $wdbh ] ); |
44
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45
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} else |
46
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{ |
47
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# $cached_dbh = $dbh; |
48
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# old way |
49
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50
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0
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$cached_read_dbh = [ $dbh ]; |
51
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0
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$cached_write_dbh = [ $dbh ]; |
52
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} |
53
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} |
54
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55
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sub __get_rand_array_el |
56
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{ |
57
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0
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0
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my $arr = shift; |
58
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# return $arr -> [ 0 ]; # not very random |
59
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60
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61
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# sub rand_el |
62
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# { |
63
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# my $arr = shift; |
64
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65
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0
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return $arr -> [ rand @{ $arr } ]; |
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0
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66
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67
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#} |
68
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69
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70
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# this method is tested to work: |
71
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72
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73
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# use strict; |
74
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75
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76
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# my @arr = ( 1 .. 10 ); |
77
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78
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# my %stats = (); |
79
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80
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# foreach ( 1 .. 10000 ) |
81
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# { |
82
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# $stats{ &rand_el( \@arr ) } ++; |
83
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# } |
84
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85
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# while( my ( $k, $v ) = each %stats ) |
86
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# { |
87
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# print $k, " => ", $v, "\n"; |
88
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# } |
89
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90
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91
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# sub rand_el |
92
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# { |
93
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# my $arr = shift; |
94
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95
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# return $arr -> [ rand @{ $arr } ]; |
96
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97
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# } |
98
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99
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# 6 => 1023 |
100
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# 3 => 1000 |
101
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# 7 => 961 |
102
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# 9 => 945 |
103
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# 2 => 998 |
104
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# 8 => 1040 |
105
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# 1 => 1071 |
106
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# 4 => 974 |
107
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# 10 => 997 |
108
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# 5 => 991 |
109
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# eugenek@carbon:~$ perl /tmp/test.pl |
110
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# 6 => 995 |
111
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# 3 => 979 |
112
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# 7 => 984 |
113
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# 9 => 1026 |
114
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# 2 => 983 |
115
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# 8 => 984 |
116
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# 4 => 1008 |
117
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# 1 => 1048 |
118
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# 10 => 1021 |
119
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# 5 => 972 |
120
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121
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122
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} |
123
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124
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sub get_dbh |
125
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{ |
126
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0
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0
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0
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my $for_what = shift; |
127
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128
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0
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my $rv = undef; |
129
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130
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0
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0
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if( $for_what eq 'write' ) |
131
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{ |
132
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0
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$rv = &get_write_dbh(); |
133
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} else |
134
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{ |
135
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0
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$rv = &get_read_dbh(); |
136
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} |
137
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0
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return $rv; |
138
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139
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} |
140
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141
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sub get_read_dbh |
142
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{ |
143
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0
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0
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0
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return &__get_rand_array_el( $cached_read_dbh ); |
144
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} |
145
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146
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sub get_write_dbh |
147
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{ |
148
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0
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0
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0
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return &__get_rand_array_el( $cached_write_dbh ); |
149
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} |
150
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151
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sub dbq |
152
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{ |
153
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0
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0
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0
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my ( $v, $dbh ) = @_; |
154
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155
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0
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0
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unless( $dbh ) |
156
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{ |
157
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0
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$dbh = &get_read_dbh(); |
158
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} |
159
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160
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0
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my $rv = undef; |
161
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162
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0
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eval { |
163
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0
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$rv = $dbh -> quote( $v ); |
164
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}; |
165
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166
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0
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0
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if( my $err = $@ ) |
167
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{ |
168
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0
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assert( 0, $err ); |
169
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} |
170
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171
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0
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return $rv; |
172
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} |
173
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174
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sub getrow |
175
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{ |
176
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0
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0
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0
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my ( $sql, $dbh ) = @_; |
177
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178
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0
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0
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unless( $dbh ) |
179
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{ |
180
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0
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warn( "(getrow) no DBH passed, failing back to write DBH" ); |
181
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0
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$dbh = &get_write_dbh(); |
182
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# assert( 0, 'cant safely fall back to read dbh here' ); |
183
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} |
184
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185
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186
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0
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return $dbh -> selectrow_hashref( $sql ); |
187
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188
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} |
189
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190
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sub prep |
191
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{ |
192
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0
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0
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0
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my ( $sql, $dbh ) = @_; |
193
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194
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0
|
0
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|
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unless( $dbh ) |
195
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{ |
196
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0
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warn( "(prep) no DBH passed, failing back to write DBH" ); |
197
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0
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$dbh = &get_write_dbh(); |
198
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# assert( 0, 'cant safely fall back to read dbh here' ); |
199
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} |
200
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201
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0
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|
return $dbh -> prepare( $sql ); |
202
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203
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} |
204
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205
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sub doit |
206
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{ |
207
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0
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0
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0
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|
my ( $sql, $dbh ) = @_; |
208
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209
|
0
|
0
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|
|
unless( $dbh ) |
210
|
|
|
|
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|
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{ |
211
|
0
|
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|
warn( "(doit) no DBH passed, failing back to write DBH" ); |
212
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0
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|
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|
|
$dbh = &get_write_dbh(); |
213
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#assert( 0, 'cant safely fall back to read dbh here too' ); |
214
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} |
215
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216
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0
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|
|
|
return $dbh -> do( $sql ); |
217
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} |
218
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219
|
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sub errstr |
220
|
|
|
|
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|
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{ |
221
|
0
|
|
|
0
|
0
|
|
my $dbh = shift; |
222
|
|
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|
|
|
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|
223
|
0
|
|
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|
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|
return $dbh -> errstr(); |
224
|
|
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} |
225
|
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|
226
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sub nextval |
227
|
|
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|
{ |
228
|
0
|
|
|
0
|
0
|
|
my ( $sn, $dbh ) = @_; |
229
|
|
|
|
|
|
|
|
230
|
0
|
0
|
|
|
|
|
unless( $dbh ) |
231
|
|
|
|
|
|
|
{ |
232
|
0
|
|
|
|
|
|
$dbh = &get_write_dbh(); |
233
|
|
|
|
|
|
|
} |
234
|
|
|
|
|
|
|
|
235
|
0
|
|
|
|
|
|
my $sql = sprintf( "SELECT nextval(%s) AS newval", &dbq( $sn, $dbh ) ); |
236
|
|
|
|
|
|
|
|
237
|
0
|
|
|
|
|
|
assert( my $rec = &getrow( $sql, $dbh ), |
238
|
|
|
|
|
|
|
sprintf( 'could not get new value from sequence %s: %s', |
239
|
|
|
|
|
|
|
$sn, |
240
|
|
|
|
|
|
|
&errstr( $dbh ) ) ); |
241
|
|
|
|
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|
|
|
242
|
0
|
|
|
|
|
|
return $rec -> { 'newval' }; |
243
|
|
|
|
|
|
|
} |
244
|
|
|
|
|
|
|
|
245
|
|
|
|
|
|
|
42; |