mongodb单层组嵌套

并没找到为什么不能直接插入，这个能用，就这样吧 ...

user:

{

     "_id" :ObjectId("57e89964b316d2e13cc0ba9b"),

     "username" :"[e-mail]",

     "nickname" : "marky",

     "address" : "云端路1024号，柯南私募基金大厦",

     "contact" :"13141250012",

     "created" :"2012-07-07"

}

 

order:

{

     "_id" :ObjectId("57e89b3ab316d2e13cc0ba9c"),

     "orderno" : "YD000001",

     "title" : "席梦思抱枕一对",

     "oriprice" : 80,

     "discount" : "0.70",

     "saleprice" : "56.00",

     "type" : "居家",

     "coupon" : 0

}

{

     "_id" :ObjectId("57e89bcfb316d2e13cc0ba9d"),

     "orderno" : "YD000002",

     "title" : "席梦思抱软硬适中床垫",

     "oriprice" : 280,

     "discount" : "0.80",

     "saleprice" : "224.00",

     "type" : "居家",

     "coupon" : 0

}

操作

>db.user.update({'orders':{$exists:false}},{$set:{'orders':[{'_id' :ObjectId("57e89b3ab316d2e13cc0ba9c"),'orderno':'YD000001','title':'席梦思抱枕一对','oriprice':80,'discount':0.70,'saleprice':56.00,'type':'居家','coupon':0}]}})

 

上面语句的意识是如果原文档中不存在orders字段，那么新增该字段，并添加对应的内容，结果显示如下则说明嵌入成功，如下：

{

     "_id" :ObjectId("57e89964b316d2e13cc0ba9b"),

     "username" :"[e-mail]",

     "nickname" : "marky",

     "address" : "云端路1024号，柯南私募基金大厦",

     "contact" :"13141250012",

     "created" :"2012-07-07",

     "orders" : [

         {

              "_id" :ObjectId("57e89b3ab316d2e13cc0ba9c"),

              "orderno" :"YD000001",

              "title" : "席梦思抱枕一对",

              "oriprice" : 80,

              "discount" : 0.7,

              "saleprice" : 56,

              "type" : "居家",

              "coupon" : 0

         }

     ]

}