querydsl如何实现 select a.sno,(select xxx from table b where a.sno=b.sno) from table a 这种查询？

Question

QVTrace trace = QVTrace.vTrace;
QVTrace subTrace = QVTrace.vTrace;

    DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

    SubQueryExpression<LocalDateTime> query = JPAExpressions.select(subTrace.recordTime)
            .from(subTrace).where(subTrace.id.eq(trace.id)).orderBy(subTrace.recordTime.desc()).limit(1);

    List<Map<String, Object>> list = getQueryFactory().select(trace.id,trace.name,query)
                                    .from(trace)
                                    .where(trace.userId.eq(userId))
                                    .orderBy(trace.recordTime.desc())
                                    .fetch()
                                    .stream()
                                    .map(tuple -> {
                                        Map<String, Object> map = new HashMap<String, Object>();
                                        map.put("id", tuple.get(trace.id));
                                        map.put("name", tuple.get(trace.name));
                                        map.put("recordTime", tuple.get(query).format(df));
                                        return map;
                                    }).collect(Collectors.toList());


                                            我是这样实现的 但是发现结果不对

Answer 1

嵌套子查询？https://blog.csdn.net/weixin_42033269/article/details/80059280 看看这个