后端：增加 cart 系统

cart/cart-service-impl/src/main/java/cn/iocoder/mall/cart/biz/config/DatabaseConfiguration.java

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+package cn.iocoder.mall.cart.biz.config;
+
+import org.mybatis.spring.annotation.MapperScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+@Configuration
+@MapperScan("cn.iocoder.mall.cart.biz.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 HikariCP
+
+}

cart/cart-service-impl/src/main/java/cn/iocoder/mall/cart/biz/config/ServiceExceptionConfiguration.java

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+package cn.iocoder.mall.cart.biz.config;
+
+import cn.iocoder.common.framework.util.ServiceExceptionUtil;
+import cn.iocoder.mall.cart.api.constant.CartErrorCodeEnum;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.event.EventListener;
+
+@Configuration
+public class ServiceExceptionConfiguration {
+
+    @EventListener(ApplicationReadyEvent.class) // 可参考 https://www.cnblogs.com/ssslinppp/p/7607509.html
+    public void initMessages() {
+        for (CartErrorCodeEnum item : CartErrorCodeEnum.values()) {
+            ServiceExceptionUtil.put(item.getCode(), item.getMessage());
+        }
+    }
+
+}

cart/cart-service-impl/src/main/java/cn/iocoder/mall/cart/biz/package-info.java

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+package cn.iocoder.mall.cart.biz;

cart/cart-service-impl/src/main/resources/config/application.properties

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+##################### 业务模块 #####################

cart/cart-service-impl/src/main/resources/config/application.yaml

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+spring:
+  # datasource
+  datasource:
+    url: jdbc:mysql://180.167.213.26:13306/mall_cart?useSSL=false&useUnicode=true&characterEncoding=UTF-8
+    driver-class-name: com.mysql.jdbc.Driver
+    username: root
+    password: ${MALL_MYSQL_PASSWORD}
+
+# mybatis
+mybatis:
+  config-location: classpath:mybatis-config.xml
+  mapper-locations: classpath:mapper/*.xml
+  type-aliases-package: cn.iocoder.mall.cart.biz.dataobject
+
+# dubbo
+dubbo:
+  application:
+    name: cart-service
+  registry:
+    address: zookeeper://127.0.0.1:2181
+  protocol:
+    port: -1
+    name: dubbo
+  scan:
+    base-packages: cn.iocoder.mall.cart.biz.service
+
+# xxl-job
+#xxl:
+#  job:
+#    admin:
+#      addresses: http://127.0.0.1:8080/xxl-job-admin
+#    executor:
+#      appname: cart-job-executor
+#      ip:
+#      port: 0
+#      logpath: /Users/yunai/logs/xxl-job/
+#      logretentiondays: 1
+#    accessToken:
+
+# rocketmq
+#rocketmq:
+#  name-server: 127.0.0.1:9876
+#  producer:
+#    group: cart-producer-group

cart/cart-service-impl/src/main/resources/mybatis-config.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
+<configuration>
+
+    <settings>
+        <!-- 使用驼峰命名法转换字段。 -->
+        <setting name="mapUnderscoreToCamelCase" value="true"/>
+    </settings>
+
+    <typeAliases>
+        <typeAlias alias="Integer" type="java.lang.Integer"/>
+        <typeAlias alias="Long" type="java.lang.Long"/>
+        <typeAlias alias="HashMap" type="java.util.HashMap"/>
+        <typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap"/>
+        <typeAlias alias="ArrayList" type="java.util.ArrayList"/>
+        <typeAlias alias="LinkedList" type="java.util.LinkedList"/>
+    </typeAliases>
+
+</configuration>