mongodb数据之间的转换

db.collectionName.find().forEach(function(x) {

x.FieldName = x.FieldName.toString();

db.collectionName.save(x);

});

db.collectionName.find().forEach(function(x) {

x.FieldName = new ISODate(x.FieldName );

db.collectionName.save(x);

});

//string转为int类型

db.collections.find().forEach( function (x) {

  x.ise= NumberInt (x.ise);

  db.collections.save(x);

});