private function createParameter()
{
$table = $this->createTable('parameter');
$table->addColumn('id', 'integer', ['autoincrement' => true]);
$table->addColumn('pkey', 'string');
$table->addColumn('value', 'string');
$table->setPrimaryKey(['id']);
$table->addIndex(['pkey', 'value']);
$this->parameterTable = $table;
}