fix bugs

database/martial-db/fix_athlete_order_id.sql

@@ -0,0 +1,19 @@
+-- ================================================================
+-- 修复参赛选手表 order_id 字段约束
+-- 问题：Field 'order_id' doesn't have a default value
+-- 解决：允许 order_id 为 NULL（支持直接添加参赛选手，无需订单）
+-- 日期：2025-12-06
+-- ================================================================
+
+-- 使用正确的数据库
+USE martial_db;
+
+-- 修改 order_id 字段，允许为 NULL
+ALTER TABLE martial_athlete
+MODIFY COLUMN order_id bigint(20) NULL DEFAULT NULL COMMENT '订单ID';
+
+-- 验证修改
+DESC martial_athlete;
+
+-- 显示修改结果
+SELECT '✓ order_id 字段已修改为可空' AS 修复结果;