C:\Windows\system32>mongo ds021711.mlab.com:1111/dbname-u dbuser -p dbpassword
2016-04-27T12:24:32.433+0100 I CONTROL [main] Hotfix KB2731284 or later update
is not installed, will zero-out data fil
按照這裏的建議MongoDB: How to change the type of a field?我嘗試更新我的集合以更改字段類型及其值。 這裏是更新查詢 db.MyCollection.find({"ProjectID" : 44, "Cost": {$exists: true}}).forEach(function(doc){
if(doc.Cost.length > 0){