计算平均分

src/main/java/com/sztzjy/money_management/service/impl/TheoryTestServiceImpl.java

@@ -170,11 +170,15 @@ public class TheoryTestServiceImpl implements TheoryTestService {
             if (record.getAverageScore() == null) {
                 record.setAverageScore(score);
             } else {
-                Integer examCount = record.getExamCount();
+                StuTheoryExamExample example = new StuTheoryExamExample();
-                BigDecimal averageScore = record.getAverageScore();
+                example.createCriteria().andUserIdEqualTo(userId).andAnsweredEqualTo(true);
-                BigDecimal multiply = averageScore.multiply(BigDecimal.valueOf(examCount));
+                List<StuTheoryExamWithBLOBs> stuTheoryExamWithBLOBs = theoryExamMapper.selectByExampleWithBLOBs(example);
-                BigDecimal newAvg = multiply.add(score).divide(BigDecimal.valueOf(examCount), 2, RoundingMode.HALF_UP);
+                BigDecimal totalScore = stuTheoryExamWithBLOBs.stream()
-                record.setAverageScore(newAvg);
+                        .map(StuTheoryExamWithBLOBs::getScore)
+                        .reduce(BigDecimal.ZERO, BigDecimal::add)
+                        .add(score);
+                BigDecimal avgScore = totalScore.divide(BigDecimal.valueOf(stuTheoryExamWithBLOBs.size()+1), 2, RoundingMode.HALF_UP);
+                record.setAverageScore(avgScore);
             }
         }
         theoryRecordMapper.updateByPrimaryKey(record);
@@ -532,6 +536,7 @@ public class TheoryTestServiceImpl implements TheoryTestService {
             System.out.println(s);
         }
     }
+
     @Override
     public List<StuTheoryExamDetailDto> getTheoryTestDetail(String theoryExamId, Integer index, Integer size) throws IOException {
         ArrayList<String> idsList = new ArrayList<>();