mongodb数据类型

查找数据类型

db.getCollection(‘users’).find({lastLearnTime:{$type:1}}).count()

修改数据类型为int

db.getCollection(‘users’).find({lastLearnTime:{$type:1}}).forEach(function(obj) {
obj.lastLearnTime = new NumberInt(obj.lastLearnTime);
db.getCollection(‘users’).save(obj);
});