path: root/config-db/OpenSLX/MetaDB/mysql.pm

# Copyright (c) 2006, 2007 - OpenSLX GmbH
#
# This program is free software distributed under the GPL version 2.
# See http://openslx.org/COPYING
#
# If you have any feedback please consult http://openslx.org/feedback and
# send your suggestions, praise, or complaints to feedback@openslx.org
#
# General information about OpenSLX can be found at http://openslx.org/
# -----------------------------------------------------------------------------
# mysql.pm
#	- provides mysql-specific overrides of the OpenSLX MetaDB API.
# -----------------------------------------------------------------------------
package OpenSLX::MetaDB::mysql;

use strict;
use vars qw($VERSION);
$VERSION = 1.01;    # API-version . implementation-version
use base qw(OpenSLX::MetaDB::DBI);

################################################################################
### This class provides a MetaDB backend for mysql databases.
### - by default the db will be created inside a 'openslxdata-mysql' directory.
################################################################################
use strict;
use Carp;
use DBD::mysql;
use OpenSLX::Basics;
use OpenSLX::MetaDB::DBI 1;

################################################################################
### implementation
################################################################################
sub new
{
	my $class = shift;
	my $self  = {};
	return bless $self, $class;
}

sub connect
{
	my $self = shift;

	my $dbSpec = $openslxConfig{'db-spec'};
	if (!defined $dbSpec) {
		# build $dbSpec from individual parameters:
		$dbSpec = "database=$openslxConfig{'db-name'}";
	}
	my $user = (getpwuid($>))[0];
	vlog(1, "trying to connect user <$user> to mysql-database <$dbSpec>");
	$self->{'dbh'} =
	  DBI->connect("dbi:mysql:$dbSpec", $user, '', {PrintError => 0})
	  or die _tr("Cannot connect to database <%s> (%s)", $dbSpec, $DBI::errstr);
}

sub schemaConvertTypeDescrToNative
{
	my $self      = shift;
	my $typeDescr = lc(shift);

	if ($typeDescr eq 'b') {
		return 'integer';
	} elsif ($typeDescr eq 'i') {
		return 'integer';
	} elsif ($typeDescr eq 'pk') {
		return 'integer AUTO_INCREMENT primary key';
	} elsif ($typeDescr eq 'fk') {
		return 'integer';
	} elsif ($typeDescr =~ m[^s\.(\d+)$]i) {
		return "varchar($1)";
	} else {
		confess _tr('UnknownDbSchemaTypeDescr', $typeDescr);
	}
}

sub schemaRenameTable
{
	my $self      = shift;
	my $oldTable  = shift;
	my $newTable  = shift;
	my $colDescrs = shift;
	my $isSubCmd  = shift;

	my $dbh = $self->{'dbh'};
	vlog(1, "renaming table <$oldTable> to <$newTable>...") unless $isSubCmd;
	my $sql = "ALTER TABLE $oldTable RENAME TO $newTable";
	vlog(3, $sql);
	$dbh->do($sql)
	  or confess _tr(q[Can't rename table <%s> (%s)], $oldTable, $dbh->errstr);
}

sub schemaAddColumns
{
	my $self              = shift;
	my $table             = shift;
	my $newColDescrs      = shift;
	my $newColDefaultVals = shift;
	my $colDescrs         = shift;
	my $isSubCmd          = shift;

	my $dbh         = $self->{'dbh'};
	my $newColNames = $self->_convertColDescrsToColNamesString($newColDescrs);
	vlog(1, "adding columns <$newColNames> to table <$table>") unless $isSubCmd;
	my $addClause = join ', ',
	  map { "ADD COLUMN " . $self->_convertColDescrsToDBNativeString([$_]); }
	  @$newColDescrs;
	my $sql = "ALTER TABLE $table $addClause";
	vlog(3, $sql);
	$dbh->do($sql)
	  or confess _tr(q[Can't add columns to table <%s> (%s)], $table,
		$dbh->errstr);
	# if default values have been provided, we apply them now:
	if (defined $newColDefaultVals) {
		$self->_doUpdate($table, undef, $newColDefaultVals);
	}
}

sub schemaDropColumns
{
	my $self         = shift;
	my $table        = shift;
	my $dropColNames = shift;
	my $colDescrs    = shift;
	my $isSubCmd     = shift;

	my $dbh = $self->{'dbh'};
	my $dropColStr = join ', ', @$dropColNames;
	vlog(1,
		"dropping columns <$dropColStr> from table <$table>...")   
	  unless $isSubCmd;
	my $dropClause = join ', ', map { "DROP COLUMN $_" } @$dropColNames;
	my $sql = "ALTER TABLE $table $dropClause";
	vlog(3, $sql);
	$dbh->do($sql)
	  or confess _tr(q[Can't drop columns from table <%s> (%s)], $table,
		$dbh->errstr);
}

sub schemaChangeColumns
{
	my $self       = shift;
	my $table      = shift;
	my $colChanges = shift;
	my $colDescrs  = shift;
	my $isSubCmd   = shift;

	my $dbh = $self->{'dbh'};
	my $changeColStr = join ', ', keys %$colChanges;
	vlog(1, "changing columns <$changeColStr> in table <$table>...")
	  unless $isSubCmd;
	my $changeClause = join ', ', map {
		"CHANGE COLUMN $_ "
		  . $self->_convertColDescrsToDBNativeString([$colChanges->{$_}]);
	  }
	  keys %$colChanges;
	my $sql = "ALTER TABLE $table $changeClause";
	vlog(3, $sql);
	$dbh->do($sql)
	  or confess _tr(q[Can't change columns in table <%s> (%s)], $table,
		$dbh->errstr);
}
1;