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## --------------------------------------------------------------------------- |
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## $Id: database.pm,v 1.2 2003/04/09 07:51:11 joko Exp $ |
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## --------------------------------------------------------------------------- |
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## $Log: database.pm,v $ |
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## Revision 1.2 2003/04/09 07:51:11 joko |
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## renamed from db.pm |
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## |
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## Revision 1.1 2003/04/08 23:09:16 joko |
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## initial commit: code from perl/libs/libdb.pm |
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## |
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## --------------------------------------------------------------------------- |
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|
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=pod |
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|
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=head1 Background |
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|
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Databases = Everything is sql |
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Perl ~ Everything is a hash ;-) |
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|
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|
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=cut |
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|
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|
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|
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package shortcuts::database; |
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|
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use strict; |
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use warnings; |
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|
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require Exporter; |
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our @ISA = qw( Exporter ); |
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our @EXPORT_OK = qw( |
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SQL_INSERT SQL_UPDATE SQL_SELECT |
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hash2sql |
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quotesql |
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dsn2dbname |
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); |
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|
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|
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use constant SQL_INSERT => 10; |
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use constant SQL_UPDATE => 11; |
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use constant SQL_SELECT => 12; |
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use constant SQL_DELETE => 13; |
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|
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|
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use Data::Dumper; |
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|
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|
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# TODO: handle usage of "$crit" in an abstract way somehow |
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sub hash2sql { |
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|
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# the arguments |
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my $table = shift; |
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my $hash = shift; |
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my $mode = shift; |
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my $crit = shift; |
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|
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# our result |
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my $sql; |
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|
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# declare commands and associated tokens |
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my @command = qw( SELECT INSERT UPDATE DELETE ); |
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my @token = ( SQL_SELECT, SQL_INSERT, SQL_UPDATE, SQL_DELETE ); |
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|
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# translate stringified mode to token |
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my $c = 0; |
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foreach (@command) { |
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$mode = $token[$c] if ($mode eq 'SQL_' . $_ || $mode eq $_); |
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$c++; |
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} |
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|
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# pre-flight check: has mode been resolved into token? |
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if ($mode !~ m/\d+/) { |
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print __PACKAGE__ . "::hash2sql: no mode, no token, no way!", "\n"; |
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return; |
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} |
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|
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# dispatch mode |
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if ($mode == SQL_SELECT) { |
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$sql = "SELECT #fields# FROM $table"; |
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} elsif ($mode == SQL_INSERT) { |
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$sql = "INSERT INTO $table (#fields#) VALUES (#values#)"; |
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} elsif ($mode == SQL_UPDATE) { |
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$sql = "UPDATE $table SET #fields-values#"; |
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} elsif ($mode == SQL_DELETE) { |
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if (!$crit) { |
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print __PACKAGE__ . "::hash2sql: Criteria required for mode 'SQL_DELETE' (\$crit must not be empty!).", "\n"; |
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return; |
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} |
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$sql = "DELETE FROM $table"; |
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} |
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|
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# apply filter? |
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if ($mode != SQL_INSERT && $crit) { |
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$sql .= " WHERE $crit" if $sql; |
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} |
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|
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my (@fields, @values); |
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foreach my $key (keys %{$hash}) { |
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push @fields, $key; |
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push @values, $hash->{$key}; |
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} |
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|
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# quote each element |
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map { if (defined $_) { $_ = "'$_'" } else { $_ = "null" } } @values; |
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|
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my $fields = join(', ', @fields); |
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my $values = join(', ', @values); |
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my $fields_values = ''; |
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my $fc = 0; |
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foreach (@fields) { |
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$fields_values .= $_ . '=' . $values[$fc] . ', '; |
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$fc++; |
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} |
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$fields_values = substr($fields_values, 0, -2); |
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|
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# FIXME: this should only be valid for 'SELECT' queries |
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$fields ||= '*'; |
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|
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$sql =~ s/#fields#/$fields/; |
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$sql =~ s/#values#/$values/; |
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$sql =~ s/#fields-values#/$fields_values/; |
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|
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print __PACKAGE__ . "::hash2sql: \$sql=$sql", "\n"; |
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|
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return $sql; |
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} |
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|
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|
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sub quotesql { |
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my $string = shift; |
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if ($string) { |
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$string =~ s/'/\\'/g; |
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} |
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return $string; |
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} |
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|
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sub dsn2dbname { |
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my $dsn = shift; |
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$dsn =~ m/database=(.+?);/; |
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my $database_name = $1; |
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return $database_name; |
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} |
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|
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1; |
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__END__ |
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