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# -*- Mode: Perl -*- |
# -*- Mode: Cperl -*- |
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# Database -- |
# Database -- |
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# ITIID : $ITI$ $Header $__Header$ |
# ITIID : $ITI$ $Header $__Header$ |
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# Author : Ulrich Pfeifer |
# Author : Ulrich Pfeifer |
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# Created On : Thu Aug 8 09:44:13 1996 |
# Created On : Thu Aug 8 09:44:13 1996 |
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# Last Modified By: Ulrich Pfeifer |
# Last Modified By: Ulrich Pfeifer |
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# Last Modified On: Sun Nov 22 18:44:48 1998 |
# Last Modified On: Sun May 30 18:34:08 1999 |
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# Language : CPerl |
# Language : CPerl |
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# Update Count : 249 |
# Update Count : 250 |
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# Status : Unknown, Use with caution! |
# Status : Unknown, Use with caution! |
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# |
# |
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# Copyright (c) 1996-1997, Ulrich Pfeifer |
# Copyright (c) 1996-1997, Ulrich Pfeifer |
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# |
# |
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=head1 NAME |
=head1 NAME |
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use File::Path qw(rmtree); |
use File::Path qw(rmtree); |
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use WAIT::Table (); |
use WAIT::Table (); |
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use Fcntl; |
use Fcntl; |
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use Carp; |
use Carp; # will use autouse later |
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# use autouse Carp => qw( croak($) ); |
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my ($HAVE_DATA_DUMPER, $HAVE_STORABLE); |
my ($HAVE_DATA_DUMPER, $HAVE_STORABLE); |
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BEGIN { |
BEGIN { |
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} |
} |
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=head2 C<$db = create WAIT::Database name =>E<gt> I<name> C<directory =E<gt>> I<dir>C<;> |
=head2 Constructor create |
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$db = WAIT::Database->create( |
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name => <name>, |
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directory => <dir> |
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); |
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Create a new database. |
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=over 10 |
=over 10 |
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If given, the database will require unique attributes over all tables. |
If given, the database will require unique attributes over all tables. |
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The function will return undef and set C<$@> on failure. |
The method will croak on failure. |
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=back |
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=cut |
=cut |
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my %parm = @_; |
my %parm = @_; |
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my $self = {}; |
my $self = {}; |
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my $dir = $parm{directory} || '.'; |
my $dir = $parm{directory} || '.'; |
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my $name = $parm{name} or croak "No name specified"; |
my $name = $parm{name}; |
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unless ($name) { |
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croak("No name specified"); |
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} |
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unless (-d $dir){ |
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croak("Directory '$dir' does not exits: $!"); |
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} |
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croak "Directory '$dir' does not exits: $!" unless -d $dir; |
if (-d "$dir/$name") { |
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croak "Directory '$name' already exists" if -d "$dir/$name"; |
warn "Warning: Directory '$dir/$name' already exists"; |
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mkdir "$dir/$name", 0775 or croak "Could not mkdir '$dir/$name': $!"; |
} else { |
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unless (mkdir "$dir/$name", 0775) { |
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croak("Could not mkdir '$dir/$name': $!"); |
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} |
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} |
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$self->{name} = $name; |
$self->{name} = $name; |
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$self->{file} = "$dir/$name"; |
$self->{file} = "$dir/$name"; |
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} |
} |
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=head2 C<$db = open WAIT::Database name =E<gt>> I<name> C<directory =E<gt>> I<dir>C<;> |
=head2 Constructor open |
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$db = WAIT::Database->open( |
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name => "foo", |
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directory => "bar" |
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); |
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Open an existing database I<foo> in directory I<bar>. |
Open an existing database I<foo> in directory I<bar>. |
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my $catalog = "$dir/$name/catalog"; |
my $catalog = "$dir/$name/catalog"; |
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my $meta = "$dir/$name/meta"; |
my $meta = "$dir/$name/meta"; |
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my $self; |
my $self; |
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if ($HAVE_STORABLE and -e $catalog |
if ($HAVE_STORABLE and -e $catalog |
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and (!-e $meta or -M $meta >= -M $catalog)) { |
and (!-e $meta or -M $meta >= -M $catalog)) { |
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$self = Storable::retrieve($catalog); |
$self = Storable::retrieve($catalog); |
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$self = do $meta; |
$self = do $meta; |
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unless (defined $self) { |
unless (defined $self) { |
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warn "\ado '$meta' did not work. Mysterious! Reverting to eval `cat $meta`\n"; |
warn "do '$meta' did not work. Mysterious! Reverting to eval `cat $meta`"; |
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sleep(4); |
sleep(4); |
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$self = eval `cat $meta`; |
$self = eval `cat $meta`; |
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} |
} |
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} |
} |
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return $self unless defined $self; |
return unless defined $self; |
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$self->{mode} = (exists $parm{mode})?$parm{mode}:(O_CREAT | O_RDWR); |
$self->{mode} = (exists $parm{mode})?$parm{mode}:(O_CREAT | O_RDWR); |
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$self; |
$self; |
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} |
} |
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} |
} |
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croak "No such database '$dir'" unless -e "$dir/meta"; |
croak "No such database '$dir'" unless -e "$dir/meta"; |
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rmtree($dir, 0, 1); |
#warn "Running rmtree on dir[$dir]"; |
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my $ret = rmtree($dir, 0, 1); |
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#warn "rmtree returned[$ret]"; |
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$ret; |
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} |
} |
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$did_save = 1; |
$did_save = 1; |
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} else { |
} else { |
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croak "Could not open '$file/meta' for writing: $!"; |
croak "Could not open '$file/meta' for writing: $!"; |
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return unless $HAVE_STORABLE; |
# never reached: return unless $HAVE_STORABLE; |
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} |
} |
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} |
} |
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if ($HAVE_STORABLE) { |
if ($HAVE_STORABLE) { |
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if (!eval {Storable::store($self, "$file/catalog")}) { |
if (!eval {Storable::store($self, "$file/catalog")}) { |
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fail ("Could not open '$file/catalog' for writing: $!"); |
croak "Could not open '$file/catalog' for writing: $!"; |
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return unless $did_save; |
# never reached: return unless $did_save; |
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} else { |
} else { |
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$did_save++; |
$did_save++; |
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} |
} |
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} |
} |
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=head2 C<$db-E<gt>create_table name =E<gt>> I<tname> ... C<;> |
=head2 C<$db-E<gt>create_table(name =E<gt>> I<tname>, ... C<);> |
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Create a new table with name I<tname>. All paraeters are passed to |
Create a new table with name I<tname>. All parameters are passed to |
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C<WAIT::Table::new> together with a filename to use. The function |
C<WAIT::Table-E<gt>new> together with a filename to use. See |
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returns a table handle (C<WAIT::Table::Handle>). |
L<WAIT::Table> for which attributes are required. The method returns a |
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table handle (C<WAIT::Table::Handle>). |
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=cut |
=cut |
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sub create_table { |
sub create_table { |
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my $self = shift; |
my $self = shift; |
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my %parm = @_; |
my %parm = @_; |
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my $name = $parm{name} || return fail("No name specified"); |
my $name = $parm{name} or croak "create_table: No name specified"; |
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my $attr = $parm{attr} or croak "create_table: No attributes specified"; |
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my $file = $self->{file}; |
my $file = $self->{file}; |
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croak "Database readonly" unless $self->{mode} & (O_CREAT | O_RDWR); |
croak "Database readonly" unless $self->{mode} & (O_CREAT | O_RDWR); |
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} |
} |
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if ($self->{uniqueatt}) { |
if ($self->{uniqueatt}) { |
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for (@{$parm{attr}}) { # attribute names must be uniqe |
for (@$attr) { # attribute names must be uniqe |
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if ($self->{attr}->{$_}) { |
if ($self->{attr}->{$_}) { |
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return fail ("Attribute '$_' is not unique") |
croak("Attribute '$_' is not unique") |
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} |
} |
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} |
} |
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} |
} |
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if ($self->{uniqueatt}) { |
if ($self->{uniqueatt}) { |
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# remember table name for each attribute |
# remember table name for each attribute |
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map ($self->{attr}->{$_} = $name, @{$parm{attr}}); |
map ($self->{attr}->{$_} = $name, @$attr); |
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} |
} |
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WAIT::Table::Handle->new($self, $name); |
WAIT::Table::Handle->new($self, $name); |
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} |
} |
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=head2 <$db-E<gt>table name =E<gt>> I<tname>C<;> |
=head2 C<$db-E<gt>table(name =E<gt>> I<tname>C<);> |
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Open a new table with name I<tname>. The function |
Open a new table with name I<tname>. The method |
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returns a table handle (C<WAIT::Table::Handle). |
returns a table handle (C<WAIT::Table::Handle). |
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=cut |
=cut |
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} |
} |
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=head2 C<$db-E<gt>drop name =E<gt>> I<tname>C<;> |
=head2 C<$db-E<gt>drop(name =E<gt>> I<tname>C<);> |
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Drop the table named I<tname>. The table should be closed before |
Drop the table named I<tname>. The table should be closed before |
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calling B<drop>. |
calling B<drop>. |
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} |
} |
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package WAIT::Table::Handle; |
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use Carp; |
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sub new { |
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my ($type, $database, $name) = @_; |
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bless [$database, $name], $type; |
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} |
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sub AUTOLOAD { |
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my $func = $WAIT::Table::Handle::AUTOLOAD; $func =~ s/.*:://; |
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my $self = $_[0]; |
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my ($database, $name) = @{$self}; |
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if (defined $database->{tables}->{$name}) { |
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if ($func eq 'drop') { |
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$database->drop_table(name => $name); |
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undef $_[0]; |
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1; |
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} elsif ($func ne 'DESTROY') { |
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shift @_; |
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if ($func eq 'open') { |
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$database->{tables}->{$name}->$func(mode => $database->{mode}, @_); |
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} else { |
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$database->{tables}->{$name}->$func(@_); |
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} |
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} |
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} else { |
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return fail("Invalid handle\n"); |
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} |
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} |
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1; |
1; |
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