-- 企业优惠快照改造(order库):三张订单表新增「企业优惠方式/折扣率/计费模板」快照列
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-- 目的:
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-- 企业账户(白名单/企业卡/VIN)订单建单时把当时生效的公司优惠设置固化到订单快照列;
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-- 结算与补偿重算时优先读订单快照(快照为空的历史订单才实时查询并回填),保证:
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-- 1) 建单后公司优惠设置变更(换折扣率/换模板)不影响历史订单的结算金额与对账口径;
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-- 2) 方式3(按优惠单价收费)的计费模板被修改/删除时,补偿重算与首次结算口径一致,不降级为原价。
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-- 新增列(允许 NULL,历史订单走「实时查询 + 回填」兼容路径):
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-- preferential_type 企业优惠方式快照(1=不优惠,2=按比例优惠,3=按优惠单价收费)
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-- service_discount_rate 服务费优惠比例快照(%,方式2使用)
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-- billing_template_id 计费模板ID快照(方式3使用)
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-- billing_template_snapshot 计费模板明细快照JSON(方式3使用,抵抗模板后续变更/删除)
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-- preferential_snapshot_time 优惠快照固化时间
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-- 创建日期: 2026-09-30
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-- 目标库:charging_pile_order
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-- 分片表:t_charging_order、t_vin_charging_order、t_card_charging_order(Mycat 逻辑表,物理分表逐片执行)
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-- 执行方式:
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-- 1) 首选「小节 A」经数据库代理(MyCat 8066)执行,代理会把 DDL 广播到全部物理分表;
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-- 2) 代理不支持分片表 DDL 时,改用「小节 B」直连后端 MySQL 实例执行(存储过程,逐物理分表,幂等);
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-- 3) 最后执行「小节 C」回查校验。
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-- 幂等说明:小节 A 为裸 ALTER,重复执行会报 Duplicate column,忽略即可(以小节 C 回查为准);
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-- 小节 B 先查 information_schema 再变更,可重复执行。
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-- ============ 小节 A:经代理执行(推荐) ============
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USE `charging_pile_order`;
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ALTER TABLE `t_charging_order`
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ADD COLUMN `preferential_type` tinyint(4) DEFAULT NULL COMMENT '企业优惠方式快照(1=不优惠,2=按比例优惠,3=按优惠单价收费;NULL=建单时未固化)',
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ADD COLUMN `service_discount_rate` decimal(5,2) DEFAULT NULL COMMENT '服务费优惠比例快照(%,方式2使用)',
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ADD COLUMN `billing_template_id` int(11) DEFAULT NULL COMMENT '计费模板ID快照(方式3使用)',
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ADD COLUMN `billing_template_snapshot` text COMMENT '计费模板明细快照JSON(方式3使用,抵抗模板后续变更/删除)',
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ADD COLUMN `preferential_snapshot_time` datetime DEFAULT NULL COMMENT '优惠快照固化时间';
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ALTER TABLE `t_vin_charging_order`
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ADD COLUMN `preferential_type` tinyint(4) DEFAULT NULL COMMENT '企业优惠方式快照(1=不优惠,2=按比例优惠,3=按优惠单价收费;NULL=建单时未固化)',
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ADD COLUMN `service_discount_rate` decimal(5,2) DEFAULT NULL COMMENT '服务费优惠比例快照(%,方式2使用)',
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ADD COLUMN `billing_template_id` int(11) DEFAULT NULL COMMENT '计费模板ID快照(方式3使用)',
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ADD COLUMN `billing_template_snapshot` text COMMENT '计费模板明细快照JSON(方式3使用,抵抗模板后续变更/删除)',
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ADD COLUMN `preferential_snapshot_time` datetime DEFAULT NULL COMMENT '优惠快照固化时间';
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ALTER TABLE `t_card_charging_order`
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ADD COLUMN `preferential_type` tinyint(4) DEFAULT NULL COMMENT '企业优惠方式快照(1=不优惠,2=按比例优惠,3=按优惠单价收费;NULL=建单时未固化)',
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ADD COLUMN `service_discount_rate` decimal(5,2) DEFAULT NULL COMMENT '服务费优惠比例快照(%,方式2使用)',
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ADD COLUMN `billing_template_id` int(11) DEFAULT NULL COMMENT '计费模板ID快照(方式3使用)',
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ADD COLUMN `billing_template_snapshot` text COMMENT '计费模板明细快照JSON(方式3使用,抵抗模板后续变更/删除)',
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ADD COLUMN `preferential_snapshot_time` datetime DEFAULT NULL COMMENT '优惠快照固化时间';
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-- ============ 小节 B:直连后端 MySQL 实例执行(代理不可用时分表执行,幂等) ============
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USE `charging_pile_order`;
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DROP PROCEDURE IF EXISTS `add_company_preferential_snapshot`;
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DELIMITER $$
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CREATE PROCEDURE `add_company_preferential_snapshot`()
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BEGIN
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DECLARE done INT DEFAULT 0;
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DECLARE target_table VARCHAR(64);
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DECLARE column_exists INT DEFAULT 0;
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-- 覆盖逻辑表(若物理存在)与 TBPARTITION 物理分表
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DECLARE table_cursor CURSOR FOR
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SELECT t.table_name
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FROM information_schema.tables t
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WHERE t.table_schema = DATABASE()
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AND t.table_name REGEXP '^t_charging_order(_[0-9]+)?$|^t_vin_charging_order(_[0-9]+)?$|^t_card_charging_order(_[0-9]+)?$';
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DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
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OPEN table_cursor;
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table_loop: LOOP
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FETCH table_cursor INTO target_table;
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IF done = 1 THEN
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LEAVE table_loop;
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END IF;
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SELECT COUNT(*) INTO column_exists
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FROM information_schema.columns
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WHERE table_schema = DATABASE()
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AND table_name = target_table
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AND column_name = 'preferential_type';
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IF column_exists = 0 THEN
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SET @ddl = CONCAT('ALTER TABLE `', target_table, '` ADD COLUMN `preferential_type` tinyint(4) DEFAULT NULL COMMENT ''企业优惠方式快照(1=不优惠,2=按比例优惠,3=按优惠单价收费;NULL=建单时未固化)''');
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PREPARE stmt FROM @ddl;
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EXECUTE stmt;
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DEALLOCATE PREPARE stmt;
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END IF;
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SELECT COUNT(*) INTO column_exists
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FROM information_schema.columns
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WHERE table_schema = DATABASE()
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AND table_name = target_table
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AND column_name = 'service_discount_rate';
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IF column_exists = 0 THEN
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SET @ddl = CONCAT('ALTER TABLE `', target_table, '` ADD COLUMN `service_discount_rate` decimal(5,2) DEFAULT NULL COMMENT ''服务费优惠比例快照(%,方式2使用)''');
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PREPARE stmt FROM @ddl;
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EXECUTE stmt;
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DEALLOCATE PREPARE stmt;
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END IF;
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SELECT COUNT(*) INTO column_exists
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FROM information_schema.columns
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WHERE table_schema = DATABASE()
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AND table_name = target_table
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AND column_name = 'billing_template_id';
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IF column_exists = 0 THEN
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SET @ddl = CONCAT('ALTER TABLE `', target_table, '` ADD COLUMN `billing_template_id` int(11) DEFAULT NULL COMMENT ''计费模板ID快照(方式3使用)''');
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PREPARE stmt FROM @ddl;
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EXECUTE stmt;
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DEALLOCATE PREPARE stmt;
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END IF;
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SELECT COUNT(*) INTO column_exists
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FROM information_schema.columns
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WHERE table_schema = DATABASE()
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AND table_name = target_table
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AND column_name = 'billing_template_snapshot';
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IF column_exists = 0 THEN
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SET @ddl = CONCAT('ALTER TABLE `', target_table, '` ADD COLUMN `billing_template_snapshot` text COMMENT ''计费模板明细快照JSON(方式3使用,抵抗模板后续变更/删除)''');
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PREPARE stmt FROM @ddl;
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EXECUTE stmt;
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DEALLOCATE PREPARE stmt;
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END IF;
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SELECT COUNT(*) INTO column_exists
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FROM information_schema.columns
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WHERE table_schema = DATABASE()
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AND table_name = target_table
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AND column_name = 'preferential_snapshot_time';
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IF column_exists = 0 THEN
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SET @ddl = CONCAT('ALTER TABLE `', target_table, '` ADD COLUMN `preferential_snapshot_time` datetime DEFAULT NULL COMMENT ''优惠快照固化时间''');
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PREPARE stmt FROM @ddl;
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EXECUTE stmt;
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DEALLOCATE PREPARE stmt;
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END IF;
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END LOOP;
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CLOSE table_cursor;
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END$$
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DELIMITER ;
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CALL `add_company_preferential_snapshot`();
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DROP PROCEDURE IF EXISTS `add_company_preferential_snapshot`;
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-- ============ 小节 C:回查校验 ============
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-- 1) 列存在性与注释(三张订单表均应覆盖逻辑表与全部物理分表):
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-- SELECT table_name, column_name, column_type, column_comment
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-- FROM information_schema.columns
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-- WHERE table_schema = 'charging_pile_order'
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-- AND column_name IN ('preferential_type', 'service_discount_rate', 'billing_template_id',
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-- 'billing_template_snapshot', 'preferential_snapshot_time')
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-- ORDER BY table_name, column_name;
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-- 预期:三张订单表及各自物理分表均存在 5 列,column_comment 中文无乱码
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-- 2) 历史订单快照为空(走实时查询 + 回填兼容路径):
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-- SELECT COUNT(*) FROM t_charging_order WHERE preferential_type IS NULL;
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-- 预期:等于存量订单数
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