add

backend/src/main/java/com/car/mapper/CarMapper.java

@@ -0,0 +1,20 @@
+package com.car.mapper;
+
+import com.car.entity.Car;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+
+import java.util.List;
+
+@Mapper
+public interface CarMapper {
+    Car findById(@Param("id") Long id);
+
+    List<Car> findAll(@Param("keyword") String keyword, @Param("isSpecial") Boolean isSpecial);
+
+    int insert(Car car);
+
+    int update(Car car);
+
+    int delete(@Param("id") Long id);
+}