使用mongo shell转换字符类型

MongoDB数据类型如下：

类型	对应数字	别名	说明
Double1	1	double
String	2	string
Object	3	object
Array	4	array
Binary data	5	binData
Undefined	6	undefined	弃用
ObjectId	7	objectId
Boolean	8	“bool”
Date	9	“date”
Null	10	“null”
Regular Expression	11	“regex”
DBPointer	12	“dbPointer”
JavaScript	13	“javascript”
Symbol	14	“symbol”
JavaScript(with scope)	15	“javascriptWithScope”
32-bit integer	16	“int”
Timestamp	17	“timestamp”
64-bit integer	18	“long”
Min key	-1	“minKey”
Max key	127	“maxKey”

js修改语句：

db.getCollection('log_pages_day').find(
{'uv' : { $type : 18 }}
).forEach(
function(x) {
    x.uv =NumberInt(x.uv);
    db.log_pages_day.save(x);
    })