mongodb笔记2(基本操作，增删改)
> db.userInfo.find(){ "_id" : 2, "name" : "xiaoyou" }
{ "_id" : 3, "name" : "yy" }
> db.userInfo.update({_id:2},{_id:3,name:"qq"})
WriteResult({
"nMatched" : 0,
"nUpserted" : 0,
"nModified" : 0,
"writeError" : {
"code" : 16837,
"errmsg" : "The _id field cannot be changed from {_id: 2.0} to {_id: 3.0}."
}
})
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