- 增加 demo 项目，用于作为脚手架的示例。目前暂未完成，提交保存下。

demo/demo-business/src/main/java/cn/iocoder/mall/demo/business/config/DatabaseConfiguration.java

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+package cn.iocoder.mall.demo.business.config;
+
+import org.mybatis.spring.annotation.MapperScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+@Configuration
+@MapperScan("cn.iocoder.mall.demo.business.dao") // 扫描对应的 Mapper 接口
+@EnableTransactionManagement(proxyTargetClass = true) // 启动事务管理。为什么使用 proxyTargetClass 参数，参见 https://blog.csdn.net/huang_550/article/details/76492600
+public class DatabaseConfiguration {
+
+    // 数据源，使用 Druid
+
+}

demo/demo-business/src/main/java/cn/iocoder/mall/demo/business/convert/DemoProductConvert.java

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+package cn.iocoder.mall.demo.business.convert;
+
+import cn.iocoder.mall.demo.business.bo.DemoProductBO;
+import cn.iocoder.mall.demo.business.dataobject.product.DemoProductDO;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mappings;
+import org.mapstruct.factory.Mappers;
+
+@Mapper
+public interface DemoProductConvert {
+
+    DemoProductConvert INSTANCE = Mappers.getMapper(DemoProductConvert.class);
+
+    @Mappings({})
+    DemoProductBO convert(DemoProductDO object);
+
+}

demo/demo-business/src/main/java/cn/iocoder/mall/demo/business/dao/DemoProductMapper.java

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+package cn.iocoder.mall.demo.business.dao;
+
+import cn.iocoder.mall.demo.business.dataobject.product.DemoProductDO;
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface DemoProductMapper extends BaseMapper<DemoProductDO> {
+
+}

demo/demo-business/src/main/java/cn/iocoder/mall/demo/business/dataobject/order/DemoOrderDO.java

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+package cn.iocoder.mall.demo.business.dataobject.order;
+
+import cn.iocoder.common.framework.dataobject.DeletableDO;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+import lombok.experimental.Accessors;
+
+/**
+ * Demo 订单
+ */
+@Data
+@Accessors(chain = true)
+@TableName(value = "orders")
+public class DemoOrderDO extends DeletableDO {
+
+    /**
+     * id
+     */
+    private Integer id;
+
+    /**
+     * 商品编号
+     */
+    private Integer productId;
+
+    /**
+     * 状态
+     *
+     * - 1、待付款
+     * - 2、待发货
+     * - 3、待收获
+     * - 4、已完成
+     * - 5、已关闭
+     */
+    private Integer status;
+
+}

demo/demo-business/src/main/java/cn/iocoder/mall/demo/business/dataobject/product/DemoProductDO.java

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+package cn.iocoder.mall.demo.business.dataobject.product;
+
+import cn.iocoder.common.framework.dataobject.DeletableDO;
+import lombok.Data;
+import lombok.experimental.Accessors;
+
+/**
+ * Demo 商品
+ */
+@Data
+@Accessors(chain = true)
+public class DemoProductDO extends DeletableDO {
+
+    /**
+     * 编号
+     */
+    private Integer id;
+
+    /**
+     * 名字
+     */
+    private String name;
+
+    /**
+     * 价格
+     */
+    private Integer price;
+    /**
+     * 库存数量
+     */
+    private Integer quantity;
+
+}

demo/demo-business/src/main/java/cn/iocoder/mall/demo/business/package-info.java

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+package cn.iocoder.mall.demo.business;

demo/demo-business/src/main/java/cn/iocoder/mall/demo/business/service/DemoOrderServiceImpl.java

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+package cn.iocoder.mall.demo.business.service;
+
+import cn.iocoder.mall.demo.business.api.DemoOrderService;
+
+public class DemoOrderServiceImpl implements DemoOrderService {
+}

demo/demo-business/src/main/java/cn/iocoder/mall/demo/business/service/DemoProductServiceImpl.java

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+package cn.iocoder.mall.demo.business.service;
+
+import cn.iocoder.mall.demo.business.api.DemoProductService;
+import cn.iocoder.mall.demo.business.bo.DemoProductBO;
+import cn.iocoder.mall.demo.business.convert.DemoProductConvert;
+import cn.iocoder.mall.demo.business.dao.DemoProductMapper;
+import cn.iocoder.mall.demo.business.dataobject.product.DemoProductDO;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class DemoProductServiceImpl implements DemoProductService {
+
+    @Autowired
+    private DemoProductMapper demoProductMapper;
+
+    @Override
+    public DemoProductBO get(Integer id) {
+        DemoProductDO product = demoProductMapper.selectById(id);
+        return DemoProductConvert.INSTANCE.convert(product);
+    }
+
+}

demo/demo-business/src/main/resources/config/application.yaml

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+spring:
+  # datasource
+  datasource:
+    url: jdbc:mysql://47.112.193.81:3306/testb5f4?useSSL=false&useUnicode=true&characterEncoding=UTF-8
+    driver-class-name: com.mysql.jdbc.Driver
+    username: testb5f4
+    password: F4df4db0ed86@11
+
+# mybatis-plus
+mybatis-plus:
+  configuration:
+    map-underscore-to-camel-case: true # 虽然默认为 true ，但是还是显示去指定下。
+  global-config:
+    db-config:
+      id-type: auto
+      logic-delete-value: 1 # 逻辑已删除值(默认为 1)
+      logic-not-delete-value: 0 # 逻辑未删除值(默认为 0)
+  mapperLocations: classpath*:mapper/*.xml
+  typeAliasesPackage: cn.iocoder.mall.demo.business.dataobject