fix: avoid global class initialization on task reads

src/main/java/com/sztzjy/linkCommerce/service/impl/TrainingTaskServiceImpl.java

@@ -197,7 +197,8 @@ public class TrainingTaskServiceImpl implements TrainingTaskService {
             }
             sort++;
         }
-        ensureAllTeachingClassTasks(trainingTaskMapper.selectList(null, null, null), operatorId);
+        // 班级任务在对应班级首次读取时按需初始化。不要在学生读取单个任务时遍历所有教学班，
+        // 否则班级数量增加会把每次页面切换的查询放大为全量写入检查。
     }
 
     @Override
@@ -475,25 +476,6 @@ public class TrainingTaskServiceImpl implements TrainingTaskService {
         return new ArrayList<>(existingByKey.values());
     }
 
-    private void ensureAllTeachingClassTasks(List<TrainingTask> defaults, String operatorId) {
-        if (schoolClassMapper == null || trainingTaskClassConfigMapper == null) {
-            return;
-        }
-        SchoolClassExample example = new SchoolClassExample();
-        example.createCriteria().andClassTypeEqualTo("TEACHING");
-        List<SchoolClass> teachingClasses = schoolClassMapper.selectByExample(example);
-        if (teachingClasses == null || teachingClasses.isEmpty()) {
-            return;
-        }
-        for (SchoolClass teachingClass : teachingClasses) {
-            if (teachingClass == null || StringUtils.isBlank(teachingClass.getSchoolClassId())) {
-                continue;
-            }
-            String creator = StringUtils.defaultIfBlank(operatorId, teachingClass.getCreatedBy());
-            ensureClassTasksInitialized(teachingClass.getSchoolClassId(), defaults, creator);
-        }
-    }
-
     private void synchronizeClassTaskDefaults(TrainingTask previousTask, TrainingTask updatedTask) {
         if (schoolClassMapper == null || trainingTaskClassConfigMapper == null
                 || previousTask == null || updatedTask == null) {

src/test/java/com/sztzjy/linkCommerce/service/impl/TrainingTaskServiceImplTest.java

@@ -332,6 +332,19 @@ class TrainingTaskServiceImplTest {
         verify(service.jdbcTemplate).execute(startsWith("CREATE TABLE IF NOT EXISTS training_task_class_config"));
     }
 
+    @Test
+    void ensureDefaultTasksDoesNotInitializeEveryTeachingClassDuringRead() {
+        TrainingTaskServiceImpl service = new TrainingTaskServiceImpl();
+        service.trainingTaskMapper = mock(TrainingTaskMapper.class);
+        service.schoolClassMapper = mock(SchoolClassMapper.class);
+        service.trainingTaskClassConfigMapper = mock(TrainingTaskClassConfigMapper.class);
+        when(service.trainingTaskMapper.selectByTaskKey(anyString())).thenReturn(new TrainingTask());
+
+        service.ensureDefaultTasks("system");
+
+        verifyNoInteractions(service.schoolClassMapper, service.trainingTaskClassConfigMapper);
+    }
+
     @Test
     void listDoesNotFilterDisabledTasksWhenEnabledOnlyIsFalse() {
         TrainingTaskServiceImpl service = new TrainingTaskServiceImpl();
@@ -346,7 +359,7 @@ class TrainingTaskServiceImplTest {
 
         assertEquals(1, result.size());
         assertFalse(result.get(0).getEnabled());
-        verify(service.trainingTaskMapper, times(2)).selectList(isNull(), isNull(), isNull());
+        verify(service.trainingTaskMapper).selectList(isNull(), isNull(), isNull());
     }
 
     @Test