【mongo】mongo 字段类型互转

mark一下
参考：
https://blog.csdn.net/laoyang360/article/details/72594344

1.str转long

1. 当int很长时
2. db.teststatement.find({"ctime":{$type: 2}}).forEach( function (x) {
   
3.   x.ctime= NumberLong (x.ctime);
   
4.   db.teststatement.save(x);
   
5. })

2.int转str

1. db.redefine_share_backwards.find( { 'share_uid' : { $gte : 0 } } ).forEach( function (x) { 
2.  x.share_uid = ""+x.share_uid;
3.  db.redefine_share_backwards.save(x);
4. })