public function up()
{
// Migrate existing data for share
$sql = 'SELECT attribute_style, share_id FROM ansel_shares';
$this->announce('Computing style hashes from ansel_shares.', 'cli.message');
$rows = $this->_connection->select($sql);
$this->_ensureHashes($rows);
// Migrate existing data for shareng
$sql = 'SELECT attribute_style, share_id FROM ansel_sharesng';
$this->announce('Computing style hashes from ansel_sharesng.', 'cli.message');
$rows = $this->_connection->select($sql);
$this->_ensureHashes($rows);
}