doctrine增加组合唯一键

use DoctrineORMMappingUniqueConstraint;

/**
 * UserTreasure
 *
 * @ORMTable(name="user_treasures", uniqueConstraints={@UniqueConstraint(name="snatch_treasure_lottery_number_unique", columns={"snatch_treasure_id", "lottery_number"})})
 * @ORMEntity(repositoryClass="TronWebBundleRepositoryUserTreasureRepository")
 */

在userTreasure表中增加组合唯一键：snatch_treasure_lottery_number_unique

它为：snatch_treasure_id，lottery_number的组合