基本完成，修复细节

tradeCattle/remove_car_number_from_member_driver.sql

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+-- ==========================================
+-- 从 member_driver 表删除 car_number 字段
+-- ==========================================
+-- 说明：
+-- 1. 司机和车辆是多对多关系，应该由独立的 vehicle 表管理
+-- 2. 删除前请确保已经将车辆信息迁移到 vehicle 表
+-- 3. 此操作不可逆，请先备份数据库
+-- ==========================================
+
+-- 步骤 1: 检查 member_driver 表结构
+SELECT '步骤1: 检查 member_driver 表结构' as '执行步骤';
+DESC member_driver;
+
+-- 步骤 2: 检查字段是否存在
+SELECT '步骤2: 检查 car_number 字段是否存在' as '执行步骤';
+SELECT COUNT(*) as 'car_number字段存在数量' 
+FROM INFORMATION_SCHEMA.COLUMNS 
+WHERE TABLE_SCHEMA = DATABASE() 
+  AND TABLE_NAME = 'member_driver' 
+  AND COLUMN_NAME = 'car_number';
+
+-- 步骤 3: 检查是否有触发器引用 car_number
+SELECT '步骤3: 检查触发器' as '执行步骤';
+SHOW TRIGGERS WHERE `Table` = 'member_driver';
+
+-- 步骤 4: 检查是否有视图引用 car_number
+SELECT '步骤4: 检查视图' as '执行步骤';
+SELECT TABLE_NAME, VIEW_DEFINITION
+FROM INFORMATION_SCHEMA.VIEWS
+WHERE TABLE_SCHEMA = DATABASE()
+  AND VIEW_DEFINITION LIKE '%car_number%';
+
+-- 步骤 5: 检查delivery表的触发器（重点检查）
+SELECT '步骤5: 检查 delivery 表触发器' as '执行步骤';
+SHOW TRIGGERS WHERE `Table` = 'delivery';
+
+-- 步骤 6: 查看完整的触发器定义
+SELECT '步骤6: 查看所有触发器的完整定义' as '执行步骤';
+SELECT 
+    TRIGGER_NAME as '触发器名称',
+    EVENT_MANIPULATION as '触发事件',
+    EVENT_OBJECT_TABLE as '关联表',
+    ACTION_STATEMENT as '触发器SQL'
+FROM INFORMATION_SCHEMA.TRIGGERS
+WHERE TRIGGER_SCHEMA = DATABASE()
+  AND ACTION_STATEMENT LIKE '%car_number%';
+
+-- ==========================================
+-- ⚠️ 重要：执行删除前请先检查上面的输出
+-- ==========================================
+-- 如果确认：
+-- 1. car_number 字段存在
+-- 2. 没有触发器或视图引用它
+-- 3. 已备份数据库
+-- 则取消下面的注释执行删除操作：
+
+-- ALTER TABLE member_driver DROP COLUMN IF EXISTS car_number;
+
+-- ==========================================
+-- 验证删除结果
+-- ==========================================
+-- 取消下面的注释验证字段已删除：
+-- SELECT '验证: car_number 字段已删除' as '执行步骤';
+-- DESC member_driver;
+-- SELECT COUNT(*) as 'car_number字段剩余数量' 
+-- FROM INFORMATION_SCHEMA.COLUMNS 
+-- WHERE TABLE_SCHEMA = DATABASE() 
+--   AND TABLE_NAME = 'member_driver' 
+--   AND COLUMN_NAME = 'car_number';
+
+-- ==========================================
+-- 说明：执行完成后请：
+-- 1. 清理后端 target 目录
+-- 2. 重新编译后端服务
+-- 3. 完全重启后端服务
+-- ==========================================
+