protected function findPrimaryKeys($table)
	{
		$pks=$this->getDbConnection()->getPdoInstance()->cubrid_schema(PDO::CUBRID_SCH_PRIMARY_KEY,$table->name);

		foreach($pks as $pk)
		{
			$c = $table->columns[$pk['ATTR_NAME']];
			$c->isPrimaryKey = true;

			if($table->primaryKey===null)
				$table->primaryKey=$c->name;
			elseif(is_string($table->primaryKey))
				$table->primaryKey=array($table->primaryKey,$c->name);
			else
				$table->primaryKey[]=$c->name;
			if($c->autoIncrement)
				$table->sequenceName='';
		}
	}