- 后端：引入分布式事务框架 seata 框架。

- 后端：目前订单提交时，如果发生异常，会回滚优惠劵的使用。

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

@@ -1,14 +1,78 @@
 package cn.iocoder.mall.promotion.biz.config;
 
+import com.alibaba.druid.pool.DruidDataSource;
+import io.seata.rm.datasource.DataSourceProxy;
+import io.seata.spring.annotation.GlobalTransactionScanner;
 import org.mybatis.spring.annotation.MapperScan;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
 import org.springframework.transaction.annotation.EnableTransactionManagement;
 
+import javax.sql.DataSource;
+
 @Configuration
 @MapperScan("cn.iocoder.mall.promotion.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
+@EnableConfigurationProperties(DataSourceProperties.class)
 public class DatabaseConfiguration {
 
     // 数据源，使用 HikariCP
 
-}
+    @Value("${spring.application.name}")
+    private String applicationId;
+
+    @Autowired
+    private DataSourceProperties dataSourceProperties;
+
+//    @Bean // TODO 芋艿，加了就一直报错，后面在找原因。
+//    @Primary
+    public DruidDataSource druidDataSource(){
+        DruidDataSource druidDataSource = new DruidDataSource();
+        druidDataSource.setUrl(dataSourceProperties.getUrl());
+        druidDataSource.setUsername(dataSourceProperties.getUsername());
+        druidDataSource.setPassword(dataSourceProperties.getPassword());
+        druidDataSource.setDriverClassName(dataSourceProperties.getDriverClassName());
+        druidDataSource.setInitialSize(0);
+        druidDataSource.setMaxActive(180);
+        druidDataSource.setMaxWait(60000);
+        druidDataSource.setMinIdle(0);
+        druidDataSource.setValidationQuery("Select 1 from DUAL");
+        druidDataSource.setTestOnBorrow(false);
+        druidDataSource.setTestOnReturn(false);
+        druidDataSource.setTestWhileIdle(true);
+        druidDataSource.setTimeBetweenEvictionRunsMillis(60000);
+        druidDataSource.setMinEvictableIdleTimeMillis(25200000);
+        druidDataSource.setRemoveAbandoned(true);
+        druidDataSource.setRemoveAbandonedTimeout(1800);
+        druidDataSource.setLogAbandoned(true);
+        return druidDataSource;
+    }
+
+    @ConfigurationProperties(prefix = "spring.datasource")
+    @Primary
+    @Bean("dataSource")
+//    @Bean
+    public DataSource dataSource() {
+        DruidDataSource dataSource = druidDataSource();
+
+        return new DataSourceProxy(dataSource);
+    }
+
+    /**
+     * 注册一个StatViewServlet
+     *
+     * @return global transaction scanner
+     */
+    @Bean
+    public GlobalTransactionScanner globalTransactionScanner() {
+        return new GlobalTransactionScanner(applicationId, "my_test_tx_group");
+        // TODO 芋艿，txServiceGroup 后续要编辑下
+    }
+
+}

promotion/promotion-service-impl/src/main/java/cn/iocoder/mall/promotion/biz/service/CouponServiceImpl.java

@@ -242,14 +242,14 @@ public class CouponServiceImpl implements CouponService {
         if (!userId.equals(card.getUserId())) {
             throw ServiceExceptionUtil.exception(PromotionErrorCodeEnum.COUPON_CARD_ERROR_USER.getCode());
         }
-        if (CouponCardStatusEnum.UNUSED.getValue().equals(card.getStatus())) {
+        if (!CouponCardStatusEnum.UNUSED.getValue().equals(card.getStatus())) {
             throw ServiceExceptionUtil.exception(PromotionErrorCodeEnum.COUPON_CARD_STATUS_NOT_UNUSED.getCode());
         }
         if (DateUtil.isBetween(card.getValidStartTime(), card.getValidEndTime())) { // 为避免定时器没跑，实际优惠劵已经过期
             throw ServiceExceptionUtil.exception(PromotionErrorCodeEnum.COUPON_CARD_STATUS_NOT_UNUSED.getCode());
         }
         // 更新优惠劵已使用
-        int updateCount = couponCardMapper.updateByIdAndStatus(card.getId(), CouponCardStatusEnum.USED.getValue(),
+        int updateCount = couponCardMapper.updateByIdAndStatus(card.getId(), CouponCardStatusEnum.UNUSED.getValue(),
                 new CouponCardDO().setStatus(CouponCardStatusEnum.USED.getValue()).setUsedTime(new Date()));
         if (updateCount == 0) {
             throw ServiceExceptionUtil.exception(PromotionErrorCodeEnum.COUPON_CARD_STATUS_NOT_UNUSED.getCode());
@@ -267,12 +267,12 @@ public class CouponServiceImpl implements CouponService {
         if (!userId.equals(card.getUserId())) {
             throw ServiceExceptionUtil.exception(PromotionErrorCodeEnum.COUPON_CARD_ERROR_USER.getCode());
         }
-        if (CouponCardStatusEnum.USED.getValue().equals(card.getStatus())) {
+        if (!CouponCardStatusEnum.USED.getValue().equals(card.getStatus())) {
             throw ServiceExceptionUtil.exception(PromotionErrorCodeEnum.COUPON_CARD_STATUS_NOT_USED.getCode());
         }
         // 更新优惠劵已使用
-        int updateCount = couponCardMapper.updateByIdAndStatus(card.getId(), CouponCardStatusEnum.UNUSED.getValue(),
-                new CouponCardDO().setStatus(CouponCardStatusEnum.USED.getValue())); // TODO 芋艿，usedTime 未设置空，后面处理。
+        int updateCount = couponCardMapper.updateByIdAndStatus(card.getId(), CouponCardStatusEnum.USED.getValue(),
+                new CouponCardDO().setStatus(CouponCardStatusEnum.UNUSED.getValue())); // TODO 芋艿，usedTime 未设置空，后面处理。
         if (updateCount == 0) {
             throw ServiceExceptionUtil.exception(PromotionErrorCodeEnum.COUPON_CARD_STATUS_NOT_USED.getCode());
         }

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

@@ -7,9 +7,18 @@ spring:
     password: ${MALL_MYSQL_PASSWORD}
 
 # mybatis
-mybatis:
-  config-location: classpath:mybatis-config.xml
-  mapper-locations: classpath:mapper/*.xml
+#mybatis:
+#  config-location: classpath:mybatis-config.xml
+#  mapper-locations: classpath:mapper/*.xml
+#  type-aliases-package: cn.iocoder.mall.promotion.biz.dataobject
+# 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
+  mapper-locations: classpath*:mapper/*.xml
   type-aliases-package: cn.iocoder.mall.promotion.biz.dataobject
 
 # dubbo