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` /** * 锁定下单商品的所有库存 */ private void lockStock(List cartPromotionItemList) { for (CartPromotionItem cartPromotionItem : cartPromotionItemList) { PmsSkuStock skuStock = skuStockMapper.selectByPrimaryKey(cartPromotionItem.getProductSkuId()); skuStock.setLockStock(skuStock.getLockStock() + cartPromotionItem.getQuantity()); skuStockMapper.updateByPrimaryKeySelective(skuStock); } }` 并发下单时 可能导致锁定库存数量小于预期值 (两个线程同时读取到某个sku的库存 第二次save覆盖第一次)