主播信息入库添加 userId 字段，添加国家信息接口

src/main/java/com/yupi/springbootinit/mapper/CountryInfoMapper.java

@@ -0,0 +1,21 @@
+package com.yupi.springbootinit.mapper;
+import com.yupi.springbootinit.model.vo.country.CountryInfoVO;
+import org.apache.ibatis.annotations.Param;
+import java.util.List;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.yupi.springbootinit.model.entity.CountryInfo;
+
+/*
+ * @author: ziin
+ * @date: 2025/6/13 13:58
+ */
+
+public interface CountryInfoMapper extends BaseMapper<CountryInfo> {
+
+    List<CountryInfoVO> selectByCountryGroupName();
+
+
+
+
+}