SET NAMES utf8mb4;
USE baiyue_order;

SET @carrier_id_exists := (
  SELECT COUNT(*) FROM information_schema.columns
  WHERE table_schema = DATABASE() AND table_name = 'ord_order' AND column_name = 'carrier_id'
);
SET @carrier_id_sql := IF(@carrier_id_exists = 0,
  'ALTER TABLE ord_order ADD COLUMN carrier_id BIGINT UNSIGNED NULL COMMENT ''船司逻辑ID快照'' AFTER channel_name',
  'SELECT 1');
PREPARE carrier_id_statement FROM @carrier_id_sql;
EXECUTE carrier_id_statement;
DEALLOCATE PREPARE carrier_id_statement;

SET @carrier_name_exists := (
  SELECT COUNT(*) FROM information_schema.columns
  WHERE table_schema = DATABASE() AND table_name = 'ord_order' AND column_name = 'carrier_name'
);
SET @carrier_name_sql := IF(@carrier_name_exists = 0,
  'ALTER TABLE ord_order ADD COLUMN carrier_name VARCHAR(128) NULL COMMENT ''船司名称快照'' AFTER carrier_id',
  'SELECT 1');
PREPARE carrier_name_statement FROM @carrier_name_sql;
EXECUTE carrier_name_statement;
DEALLOCATE PREPARE carrier_name_statement;