java转mongo代码

db.Trade.aggregate([
    {"$unwind":"$doList"},
    {"$unwind":"$doList.doItemList"},
    {"$match":{"doList._id":ObjectId("5bae19a6d365f72868e03408")},
    {"$project":{"doList":1,"pfDocNo":1}}
])

db.Trade.find({pfDocNo:"201809290025400909"})
   .projection({"doList.doItemList":1,_id:0})
   .sort({_id:-1})
   .limit(100)

获取展开式