修改班级表结构，部分查询代码

src/main/java/com/sztzjy/financial_bigdata/controller/stu/StuIndexController.java

@@ -127,7 +127,9 @@ public class StuIndexController {
 
         StuUserDto stuUserDto = new StuUserDto();
         BeanUtils.copyProperties(stuUser, stuUserDto);
-        StuClass stuClass = stuClassMapper.selectByPrimaryKey(stuUser.getClassId());
+        StuClassExample example =new StuClassExample();
+        List<StuClass> stuClassList = stuClassMapper.selectByExample(example);
+        StuClass stuClass = stuClassList.get(0);
         stuUserDto.setClassName(stuClass.getClassName());
         stuUserDto.setIpPlace(sysLoginLogs.get(0).getIpAddress());
         stuUserDto.setLastIP(sysLoginLogs.get(0).getLoginIp());

src/main/java/com/sztzjy/financial_bigdata/controller/tea/TeaExamManageController.java

@@ -154,9 +154,12 @@ public class TeaExamManageController {
                     list.add(s);
                 }
             }
+
+            StuClassExample example =new StuClassExample();
+            example.createCriteria().andClassIdIn(list);
+            List<StuClass> stuClasslist = stuClassMapper.selectByExample(example);
             String s = "";
-            for (String id : list) {
-                StuClass stuClass = stuClassMapper.selectByPrimaryKey(id);
+            for (StuClass stuClass : stuClasslist) {
                 s += stuClass.getClassName() + ",";
             }
             // 去掉最后一个逗号

src/main/java/com/sztzjy/financial_bigdata/controller/tea/TeaGradeManageController.java

@@ -221,11 +221,18 @@ public class TeaGradeManageController {
         if (!teaAndStudentExams.isEmpty()) {
             TeaAndStudentExam teaAndStudentExam = teaAndStudentExams.get(0);
             String classId = teaAndStudentExam.getClassId();
+
+
             String[] split = classId.split(",");
-            for (String singleId : split) {
-                StuClass stuClass = stuClassMapper.selectByPrimaryKey(singleId);
+            List<String> idlist = Arrays.asList(split);
+
+            StuClassExample example =new StuClassExample();
+            example.createCriteria().andClassIdIn(idlist);
+            List<StuClass> stuClassList = stuClassMapper.selectByExample(example);
+
+            for (StuClass stuClass : stuClassList) {
                 String className = stuClass.getClassName();
-                map.put(singleId, className);
+                map.put(stuClass.getId(), className);
             }
             list.add(map);
         }
@@ -475,7 +482,9 @@ public class TeaGradeManageController {
                 StuUser user = userMapper.selectByPrimaryKey(trainingReport.getUserId());
                 trainingReportDto.setName(user.getName());
                 trainingReportDto.setStudentId(user.getStudentId());
-                StuClass stuClass = stuClassMapper.selectByPrimaryKey(user.getClassId());
+                StuClassExample example =new StuClassExample();
+                List<StuClass> stuClassList = stuClassMapper.selectByExample(example);
+                StuClass stuClass = stuClassList.get(0);
                 trainingReportDto.setClassName(stuClass.getClassName());
                 list.add(trainingReportDto);
             }