語法:數組
db.集合.find({"列":{$type:2}}).forEach(function(x){ x.列=parseFloat(x.列);db.order.save(x) })
db.order.find({"saleprice":{$type:2}}).forEach(function(x){x.saleprice=parseFloat(x.saleprice);db.order.save(x)})ide
( find().裏爲數據對應的類型,2表示str。也能夠不寫 )spa
Object ID :文檔的id.net
String: 字符串,最經常使用,必須是utf-83d
Boolean:布爾值,true 或者falseunix
Integer:整數code
Double:浮點數blog
Arrays:數組或者列表,多個值存儲到一個鍵進程
Object:用於嵌入文檔,即一個值爲一個文檔utf-8
Null:存儲null值
Timestamp:時間戳
Date:存儲當前日期或時間unix時間格式
Object ID:
每一個文檔都有一個屬性,爲_id保證文檔的惟一性;
能夠本身去設置_id插入文檔
若是本身沒設置,mongoDB爲每一個文檔提供一個獨特的_id ,是一個12字節十六進制數
前4個字節爲當前時間戳
接下來的3個字節爲機器ID
接下來2個字節爲mongo的服務進程ID
最後3個是簡單的增量值
常見的轉化
db.getCollection('bond_sentiment_bulletin').find({'pubDate': {$type:2}}).forEach( function(doc){ db.getCollection('bond_sentiment_bulletin').update({'_id': doc._id},{$set:{'pubDate': new ISODate(doc.pubDate)}}) } ) or db.getCollection('bond_sentiment_bulletin').find({'pubDate': {$type:2}}).forEach( function(doc){ doc.pubDate = new ISODate(doc.pubDate); db.getCollection('bond_sentiment_bulletin').save(doc); } )
db.getCollection('bond_sentiment_bulletin').find({"_id" : 416,'pubDate':{$type:9}}).forEach( function(x){ x.pubDate = x.pubDate.toISOString(); db.getCollection('bond_sentiment_bulletin').save(x); } )
db.getCollection('bond_sentiment_bulletin').find({"_id" : 419}).forEach( function(x){ x.status = String(x.status); db.getCollection('bond_sentiment_bulletin').save(x); } )
db.getCollection('bond_sentiment_bulletin').find({"_id" : 419,'pubDate':{$type:9}}).forEach( function(x){ x.pubDate = NumberLong(x.pubDate.getTime()/1000); db.getCollection('bond_sentiment_bulletin').save(x); } )
db.getCollection('bond_sentiment_bulletin').find({'sentiment' : { $type : 1 }}).forEach( function(x) { x.sentiment = NumberInt(x.sentiment); db.getCollection('bond_sentiment_bulletin').save(x); } )
db.getCollection('bond_sentiment_bulletin').find({'editTime': {$type:2}}).forEach( function(doc){ db.getCollection('bond_sentiment_bulletin').update({'_id': doc._id},{$set:{'editTime': parseFloat(doc.editTime)}}) } )
db.getCollection('bond_sentiment_bulletin').find({'editTime': {$type:2}}).forEach( function(doc){ db.getCollection('bond_sentiment_bulletin').update({'_id': doc._id},{$set:{'editTime': parseInt(doc.editTime)}}) } )
參考:
https://blog.csdn.net/xc_zhou/article/details/86644144