曾经写过一个感觉比较复杂的业务,大家看看是否能直接SQL解决呢?

/** * excel排序根据LoanNo * 先进行整个list列表的序号填充 * 获取loanNo借据号不为空的进行排序,相同借据号的排序到一起 * 将相同借据号的数据提示,[与第2,3条借据号重复][与第1,3条借据号重复][与1,2条借据号重复] * 可针对三种情况导出列表,<T>对导出的借据号重复的放在一起(并提示与哪一行重复),为null的排除 * TODO 因为现在导出列表时最后也有写入序号,所以在执行这个方法时只能取消导出时的写入序号操作 * * @param list * @param <T> */ public static <T> List<T> excelSortLoanNo(List<T> list) { // list = listForIncrementSequence(list,1); Predicate<List<T>> singleOrNot = equalsList -> equalsList.size() > 1; //可针对三种情况导出列表,<T>对导出的借据号重复的放在一起(并提示与哪一行重复),为null的排除 List listVisiable = list.stream() .filter(exl -> { try { Field field = exl.getClass().getDeclaredField(LOAN_NUMBER); field.setAccessible(true); return field.get(exl) != null; } catch (NoSuchFieldException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } return false; }) .sorted((in1, in2) -> { Field field1 = null; Field field2 = null; try { field1 = in1.getClass().getDeclaredField(LOAN_NUMBER); field2 = in2.getClass().getDeclaredField(LOAN_NUMBER); field1.setAccessible(true); field2.setAccessible(true); } catch (NoSuchFieldException e) { log.error("excelSortLoanNo字段不存在"); } return field1.hashCode() - field2.hashCode(); }) .collect(Collectors.groupingBy(exl -> { try { Field declaredField = exl.getClass().getDeclaredField(LOAN_NUMBER); declaredField.setAccessible(true); return declaredField.get(exl); } catch (IllegalAccessException e) { log.error("checkOutListCondition非法访问"); throw new RuntimeException("提取数据异常"); } catch (NoSuchFieldException e) { log.error("checkOutListCondition字段不存在"); throw new RuntimeException("提取数据异常"); } })) .values().stream() .filter(loanNoDuplicateList -> singleOrNot.test(loanNoDuplicateList)) .map(oneGroup -> { //先设定sequenceId的话在进入这里就会被打乱了 List<Object> sequenceIds = oneGroup.stream().map(one -> { try { Field declaredField = one.getClass().getDeclaredField(SEQUENCE_NAME); declaredField.setAccessible(true); return declaredField.get(one); } catch (NoSuchFieldException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } return null; }).collect(Collectors.toList()); return oneGroup.stream() .peek(one -> { try { Field failedReasons = one.getClass().getDeclaredField(FAILED_REASONS); failedReasons.setAccessible(true); Object reasonsOld = failedReasons.get(one); Field sequenceField = one.getClass().getDeclaredField(SEQUENCE_NAME); sequenceField.setAccessible(true); Object thisOneSequenceId = sequenceField.get(one); List<Object> sequenceIdList = sequenceIds.stream() .filter(se -> !se.equals(thisOneSequenceId)).collect(Collectors.toList()); Object[] sequenceIdArr = sequenceIdList.stream().toArray(); String sequenceIdArrStr = StringUtils.join(sequenceIdArr, ","); String failedReasonsFresh = reasonsOld.toString() //按测试需求,这里的字符串被更改处,都是在mapper中设定的failedReasons中的 //com/chinacscs/fgf/gi/mapper/GiExcelImportTempCommonMapper.java:23 .replace("excel内借据号重复", "excel内借据号重复,与序号" + sequenceIdArrStr + "条重复"); // String failedReasonsFresh = reasonsOld + "[该条借据号与序号" + sequenceIdArrStr + "重复]"; failedReasons.set(one, failedReasonsFresh); } catch (NoSuchFieldException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } }) .collect(Collectors.toList()); }) .reduce((l1, l2) -> { l1.addAll(l2); return l1; }) .filter(list1 -> !CollectionUtils.isEmpty(list1)) .orElse(Collections.EMPTY_LIST); list.removeAll(listVisiable); listVisiable.addAll(list); return listVisiable; }