-- 库存流水记下装货/送货产品明细，同一产品的多段归档各自保留一条流水。
-- MySQL 5.7 / utf8mb4。可重复执行。已有流水的两个字段为空，不改数量和金额。
SET NAMES utf8mb4;

SET @col_exists = (
  SELECT COUNT(*) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'pl_inventory_transaction'
    AND COLUMN_NAME = 'stop_type'
);
SET @ddl = IF(
  @col_exists = 0,
  'ALTER TABLE `pl_inventory_transaction` ADD COLUMN `stop_type` varchar(20) NOT NULL DEFAULT '''' COMMENT ''来源段类型：load装货 delivery送货，按产品归档为空'' AFTER `plan_no`',
  'SELECT 1'
);
PREPARE stmt FROM @ddl;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @col_exists = (
  SELECT COUNT(*) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'pl_inventory_transaction'
    AND COLUMN_NAME = 'stop_product_id'
);
SET @ddl = IF(
  @col_exists = 0,
  'ALTER TABLE `pl_inventory_transaction` ADD COLUMN `stop_product_id` varchar(64) NOT NULL DEFAULT '''' COMMENT ''装货或送货产品明细ID，按产品归档为空'' AFTER `stop_type`',
  'SELECT 1'
);
PREPARE stmt FROM @ddl;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;