add

backend/src/main/java/com/carmaintenance/controller/AppointmentController.java

@@ -122,6 +122,6 @@ public class AppointmentController {
             return Result.notFound("预约不存在");
         }
         appointmentRepository.deleteById(id);
-        return Result.success("删除成功");
+        return Result.<Void>success("删除成功", null);
     }
 }

backend/src/main/java/com/carmaintenance/controller/AuthController.java

@@ -82,6 +82,6 @@ public class AuthController {
      */
     @PostMapping("/logout")
     public Result<Void> logout() {
-        return Result.success("退出成功");
+        return Result.<Void>success("退出成功", null);
     }
 }

backend/src/main/java/com/carmaintenance/controller/PartsInventoryController.java

@@ -109,6 +109,6 @@ public class PartsInventoryController {
             return Result.notFound("配件不存在");
         }
         partsInventoryRepository.deleteById(id);
-        return Result.success("删除成功");
+        return Result.<Void>success("删除成功", null);
     }
 }

backend/src/main/java/com/carmaintenance/controller/ServiceOrderController.java

@@ -126,7 +126,7 @@ public class ServiceOrderController {
             return Result.notFound("工单不存在");
         }
         serviceOrderRepository.deleteById(id);
-        return Result.success("删除成功");
+        return Result.<Void>success("删除成功", null);
     }
 
     /**

backend/src/main/java/com/carmaintenance/controller/UserController.java

@@ -102,7 +102,7 @@ public class UserController {
             return Result.notFound("用户不存在");
         }
         userRepository.deleteById(id);
-        return Result.success("删除成功");
+        return Result.<Void>success("删除成功", null);
     }
 
     /**
@@ -123,6 +123,6 @@ public class UserController {
 
         user.setPassword(newPassword);
         userRepository.save(user);
-        return Result.success("密码修改成功");
+        return Result.<Void>success("密码修改成功", null);
     }
 }

backend/src/main/java/com/carmaintenance/controller/VehicleController.java

@@ -107,6 +107,6 @@ public class VehicleController {
             return Result.notFound("车辆不存在");
         }
         vehicleRepository.deleteById(id);
-        return Result.success("删除成功");
+        return Result.<Void>success("删除成功", null);
     }
 }

backend/src/main/resources/application.properties

@@ -5,9 +5,9 @@ server.servlet.context-path=/api
 
 # 数据库配置
 spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
-spring.datasource.url=jdbc:mysql://localhost:3306/car_maintenance_db?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true
+spring.datasource.url=jdbc:mysql://localhost:3307/car_maintenance_db?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true
 spring.datasource.username=root
-spring.datasource.password=123456
+spring.datasource.password=qq5211314
 
 # JPA配置
 spring.jpa.database=mysql