SET NAMES utf8mb4;
USE baiyue_order;
-- MySQL 8 可重复执行的订单快照及履约字段迁移。
SET @schema_name = DATABASE();
SET @sql = IF((SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA=@schema_name AND TABLE_NAME='ord_order' AND COLUMN_NAME='receiving_warehouse_address')=0,
 'ALTER TABLE ord_order ADD COLUMN receiving_warehouse_address VARCHAR(600) NULL COMMENT ''收货仓地址历史快照'' AFTER receiving_warehouse_name','SELECT 1');
PREPARE s FROM @sql; EXECUTE s; DEALLOCATE PREPARE s;
SET @sql = IF((SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA=@schema_name AND TABLE_NAME='ord_order' AND COLUMN_NAME='receiving_time')=0,
 'ALTER TABLE ord_order ADD COLUMN receiving_time VARCHAR(100) NULL COMMENT ''收货时间历史快照'' AFTER receiving_warehouse_address','SELECT 1');
PREPARE s FROM @sql; EXECUTE s; DEALLOCATE PREPARE s;
SET @sql = IF((SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA=@schema_name AND TABLE_NAME='ord_order' AND COLUMN_NAME='express_company')=0,
 'ALTER TABLE ord_order ADD COLUMN express_company VARCHAR(64) NULL COMMENT ''履约快递公司'' AFTER reference_id','SELECT 1');
PREPARE s FROM @sql; EXECUTE s; DEALLOCATE PREPARE s;
SET @sql = IF((SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA=@schema_name AND TABLE_NAME='ord_order' AND COLUMN_NAME='express_tracking_no')=0,
 'ALTER TABLE ord_order ADD COLUMN express_tracking_no VARCHAR(128) NULL COMMENT ''履约快递单号'' AFTER express_company','SELECT 1');
PREPARE s FROM @sql; EXECUTE s; DEALLOCATE PREPARE s;