增加产品导入功能
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-- 已存在 bms_product_country 时升级:增加重量段最小/最大值,便于后续按重量匹配
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-- 执行后请重新在「产品列表」导入 Excel(旧数据一行一国 → 新数据按重量段多行)
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SET NAMES utf8mb4;
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ALTER TABLE bms_product_country
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ADD COLUMN weight_min decimal(10,3) DEFAULT NULL COMMENT '重量段最小值KG(含)' AFTER country_code,
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ADD COLUMN weight_max decimal(10,3) DEFAULT NULL COMMENT '重量段最大值KG(含)' AFTER weight_min;
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-- 旧唯一键(国家级)改为重量段级
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ALTER TABLE bms_product_country DROP INDEX uk_product_country;
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ALTER TABLE bms_product_country
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ADD UNIQUE KEY uk_product_country_weight (product_code, country_name, weight_min, weight_max),
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ADD KEY idx_weight_match (product_code, country_code, weight_min, weight_max);
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