Initial commit: backend code

src/main/java/com/example/building/mapper/CategoryMapper.java

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+package com.example.building.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.example.building.entity.Category;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 分类Mapper接口
+ */
+@Mapper
+public interface CategoryMapper extends BaseMapper<Category> {
+}

src/main/java/com/example/building/mapper/CustomerMapper.java

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+package com.example.building.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.example.building.entity.Customer;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 客户Mapper接口
+ */
+@Mapper
+public interface CustomerMapper extends BaseMapper<Customer> {
+}

src/main/java/com/example/building/mapper/OrderItemMapper.java

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+package com.example.building.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.example.building.entity.OrderItem;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 订单明细Mapper接口
+ */
+@Mapper
+public interface OrderItemMapper extends BaseMapper<OrderItem> {
+}

src/main/java/com/example/building/mapper/OrderMapper.java

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+package com.example.building.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.example.building.entity.Order;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 订单Mapper接口
+ */
+@Mapper
+public interface OrderMapper extends BaseMapper<Order> {
+}

src/main/java/com/example/building/mapper/ProductMapper.java

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+package com.example.building.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.example.building.entity.Product;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 商品Mapper接口
+ */
+@Mapper
+public interface ProductMapper extends BaseMapper<Product> {
+}

src/main/java/com/example/building/mapper/StockFlowMapper.java

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+package com.example.building.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.example.building.entity.StockFlow;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 库存流水Mapper接口
+ */
+@Mapper
+public interface StockFlowMapper extends BaseMapper<StockFlow> {
+}

src/main/java/com/example/building/mapper/StockMapper.java

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+package com.example.building.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.example.building.entity.Stock;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 库存Mapper接口
+ */
+@Mapper
+public interface StockMapper extends BaseMapper<Stock> {
+}

src/main/java/com/example/building/mapper/UserMapper.java

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+package com.example.building.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.example.building.entity.User;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 用户Mapper接口
+ */
+@Mapper
+public interface UserMapper extends BaseMapper<User> {
+}