| 1 |
## --------------------------------------------------------------------------- |
| 2 |
## $Id: database.pm,v 1.3 2003/04/11 01:06:44 joko Exp $ |
| 3 |
## --------------------------------------------------------------------------- |
| 4 |
## $Log: database.pm,v $ |
| 5 |
## Revision 1.3 2003/04/11 01:06:44 joko |
| 6 |
## enhanced hash2sql: |
| 7 |
## + revamped crud action tokenizer |
| 8 |
## + introduced SQL_DELETE |
| 9 |
## |
| 10 |
## Revision 1.2 2003/04/09 07:51:11 joko |
| 11 |
## renamed from db.pm |
| 12 |
## |
| 13 |
## Revision 1.1 2003/04/08 23:09:16 joko |
| 14 |
## initial commit: code from perl/libs/libdb.pm |
| 15 |
## |
| 16 |
## --------------------------------------------------------------------------- |
| 17 |
|
| 18 |
=pod |
| 19 |
|
| 20 |
=head1 Background |
| 21 |
|
| 22 |
Databases = Everything is sql |
| 23 |
Perl ~ Everything is a hash ;-) |
| 24 |
|
| 25 |
|
| 26 |
=cut |
| 27 |
|
| 28 |
|
| 29 |
|
| 30 |
package shortcuts::database; |
| 31 |
|
| 32 |
use strict; |
| 33 |
use warnings; |
| 34 |
|
| 35 |
require Exporter; |
| 36 |
our @ISA = qw( Exporter ); |
| 37 |
our @EXPORT_OK = qw( |
| 38 |
SQL_INSERT SQL_UPDATE SQL_SELECT |
| 39 |
hash2sql |
| 40 |
quotesql |
| 41 |
dsn2dbname |
| 42 |
); |
| 43 |
|
| 44 |
|
| 45 |
use constant SQL_INSERT => 10; |
| 46 |
use constant SQL_UPDATE => 11; |
| 47 |
use constant SQL_SELECT => 12; |
| 48 |
use constant SQL_DELETE => 13; |
| 49 |
|
| 50 |
|
| 51 |
use Data::Dumper; |
| 52 |
|
| 53 |
|
| 54 |
# TODO: handle usage of "$crit" in an abstract way somehow |
| 55 |
sub hash2sql { |
| 56 |
|
| 57 |
# the arguments |
| 58 |
my $table = shift; |
| 59 |
my $hash = shift; |
| 60 |
my $mode = shift; |
| 61 |
my $crit = shift; |
| 62 |
|
| 63 |
# our result |
| 64 |
my $sql; |
| 65 |
|
| 66 |
# declare commands and associated tokens |
| 67 |
my @command = qw( SELECT INSERT UPDATE DELETE ); |
| 68 |
my @token = ( SQL_SELECT, SQL_INSERT, SQL_UPDATE, SQL_DELETE ); |
| 69 |
|
| 70 |
# translate stringified mode to token |
| 71 |
my $c = 0; |
| 72 |
foreach (@command) { |
| 73 |
$mode = $token[$c] if ($mode eq 'SQL_' . $_ || $mode eq $_); |
| 74 |
$c++; |
| 75 |
} |
| 76 |
|
| 77 |
# pre-flight check: has mode been resolved into token? |
| 78 |
if ($mode !~ m/\d+/) { |
| 79 |
print __PACKAGE__ . "::hash2sql: no mode, no token, no way!", "\n"; |
| 80 |
return; |
| 81 |
} |
| 82 |
|
| 83 |
# dispatch mode |
| 84 |
if ($mode == SQL_SELECT) { |
| 85 |
$sql = "SELECT #fields# FROM $table"; |
| 86 |
} elsif ($mode == SQL_INSERT) { |
| 87 |
$sql = "INSERT INTO $table (#fields#) VALUES (#values#)"; |
| 88 |
} elsif ($mode == SQL_UPDATE) { |
| 89 |
$sql = "UPDATE $table SET #fields-values#"; |
| 90 |
} elsif ($mode == SQL_DELETE) { |
| 91 |
if (!$crit) { |
| 92 |
print __PACKAGE__ . "::hash2sql: Criteria required for mode 'SQL_DELETE' (\$crit must not be empty!).", "\n"; |
| 93 |
return; |
| 94 |
} |
| 95 |
$sql = "DELETE FROM $table"; |
| 96 |
} |
| 97 |
|
| 98 |
# apply filter? |
| 99 |
if ($mode != SQL_INSERT && $crit) { |
| 100 |
$sql .= " WHERE $crit" if $sql; |
| 101 |
} |
| 102 |
|
| 103 |
my (@fields, @values); |
| 104 |
foreach my $key (keys %{$hash}) { |
| 105 |
push @fields, $key; |
| 106 |
push @values, $hash->{$key}; |
| 107 |
} |
| 108 |
|
| 109 |
# quote each element |
| 110 |
map { if (defined $_) { $_ = "'$_'" } else { $_ = "null" } } @values; |
| 111 |
|
| 112 |
my $fields = join(', ', @fields); |
| 113 |
my $values = join(', ', @values); |
| 114 |
my $fields_values = ''; |
| 115 |
my $fc = 0; |
| 116 |
foreach (@fields) { |
| 117 |
$fields_values .= $_ . '=' . $values[$fc] . ', '; |
| 118 |
$fc++; |
| 119 |
} |
| 120 |
$fields_values = substr($fields_values, 0, -2); |
| 121 |
|
| 122 |
# FIXME: this should only be valid for 'SELECT' queries |
| 123 |
$fields ||= '*'; |
| 124 |
|
| 125 |
$sql =~ s/#fields#/$fields/; |
| 126 |
$sql =~ s/#values#/$values/; |
| 127 |
$sql =~ s/#fields-values#/$fields_values/; |
| 128 |
|
| 129 |
#print __PACKAGE__ . "::hash2sql: \$sql=$sql", "\n"; |
| 130 |
|
| 131 |
return $sql; |
| 132 |
} |
| 133 |
|
| 134 |
|
| 135 |
sub quotesql { |
| 136 |
my $string = shift; |
| 137 |
if ($string) { |
| 138 |
$string =~ s/'/\\'/g; |
| 139 |
} |
| 140 |
return $string; |
| 141 |
} |
| 142 |
|
| 143 |
sub dsn2dbname { |
| 144 |
my $dsn = shift; |
| 145 |
$dsn =~ m/database=(.+?);/; |
| 146 |
my $database_name = $1; |
| 147 |
return $database_name; |
| 148 |
} |
| 149 |
|
| 150 |
1; |
| 151 |
__END__ |
Parent Directory
| 
Revision Log
