abortIf($this->connection->getDatabasePlatform()->getName() != 'mysql', 'Migration can only be executed safely on \'mysql\'.'); // 删除 kujiale_designer_works_item_rel 表的唯一索引 uk_design_id $this->addSql('ALTER TABLE kujiale_designer_works_item_rel DROP INDEX uk_design_id'); } /** * @param Schema $schema */ public function down(Schema $schema): void { $this->abortIf($this->connection->getDatabasePlatform()->getName() != 'mysql', 'Migration can only be executed safely on \'mysql\'.'); // 恢复唯一索引 uk_design_id $this->addSql('ALTER TABLE kujiale_designer_works_item_rel ADD UNIQUE KEY uk_design_id (design_id)'); } }