init

server-db/src/main/java/cn/exploring/engine/server/db/service/StudentInfoService.java

 package cn.exploring.engine.server.db.service;
 
+import cn.exploring.engine.server.db.dao.SpecialSqlMapper;
 import cn.exploring.engine.server.db.dao.StudentInfoMapper;
 import cn.exploring.engine.server.db.domain.StudentInfo;
 import cn.exploring.engine.server.db.domain.StudentInfoExample;
@@ -9,6 +10,7 @@ import org.springframework.util.StringUtils;
 import javax.annotation.Resource;
 import java.time.LocalDateTime;
 import java.util.List;
+import java.util.Map;
 
 @Service
 public class StudentInfoService {
@@ -16,6 +18,9 @@ public class StudentInfoService {
     @Resource
     StudentInfoMapper studentInfoMapper;
 
+    @Resource
+    SpecialSqlMapper specialSqlMapper;
+
     /**
      * 添加
      * @param studentInfo
@@ -29,6 +34,15 @@ public class StudentInfoService {
         return "添加成功";
     }
 
+    /**
+     * 随机选取一个 学生数据
+     * @param classId
+     * @return
+     */
+    public Map selectStudentInfo(Integer classId) {
+        return specialSqlMapper.selectRandomStudentInfo(classId);
+    }
+
     /**
      * 更新数据
      * @param studentInfo