db.AdditionalTimes.find({"uid":{$type:18}}).forEach(function(x){x.uid=String(x.uid);db.AdditionalTimes.save(x)})
如上是将NumberLong类型转换为string类型
类型对照图如下
TypeNumberAliasNotesDouble1“double” String2“string” Object3“object” Array4“array” Binary data5“binData” Undefined6“undefined”Deprecated.ObjectId7“objectId” Boolean8“bool” Date9“date” Null10“null” Regular Expression11“regex” DBPointer12“dbPointer”Deprecated.JavaScript13“javascript” Symbol14“symbol”Deprecated.JavaScript (with scope)15“javascriptWithScope” 32-bit integer16“int” Timestamp17“timestamp” 64-bit integer18“long” Decimal12819“decimal”New in version 3.4.Min key-1“minKey” Max key127“maxKey”