Mongo新手,接受分析任务,并有一个模式问题。
我来自SQL server,我有4个表...
stats_landing_table
-------------------
id
post_id
visit_date
country
browser
impressions
stats_geo_table
---------------
id
post_id
date
country
country_count
stats_browser_table
-------------------
id
post_id
date
browser
browser_count
stats_impre
我有以下文件: class Note(EmbeddedDocument):
value = mongo_db.StringField(max_length=200, required=True)
id = mongo_db.UUIDField(required=True, primary_key=True)
class Post(Document,):
notes = mongo_db.ListField(mongo_db.EmbeddedDocumentField(Note)) 如何编写更新Note对象列表中Post对象的value字段的语句。换句话说,如何编写
在使用官方C#驱动程序访问mongo时,我遇到了问题。
public abstract class AggregateRoot
{
/// <summary>
/// All mongoDb documents must have an id, we specify it here
/// </summary>
protected AggregateRoot()
{
Id = ObjectId.GenerateNewId();
}
[BsonId]
public ObjectId Id {
我在一个web抓取项目中使用MongoEngine。我想跟踪我在所有抓取的网页上遇到的所有图像。
为此,我存储了图像src URL和图像被遇到的次数。
MongoEngine模型定义如下:
class ImagesUrl(Document):
""" Model representing images encountered during web-scraping.
When an image is encountered on a web-page during scraping,
we store its url and the numbe
Account has embedded
Transactions
amount (positive for received transactions, negative for outgoing transactions)
用户想要汇款。我们需要计算账户余额来检查是否有足够的钱。在伪代码中:
send_money(amount)
balance = sum(account's all transactions) // Mongo Query 1
if (amount <= balance)
add a new transaction to acco