[英]Partial mongodb upsert using the c# driver?
Mongo version 1.8.2. Mongo版本1.8.2。
Assume I have a class like 假设我有一个像
public class Acc
{
public int _id { get; set; }
public int? Foo { get; set; }
public int? Bar{ get; set; }
}
Acc a = new Acc
{
_id = 1,
Foo = 3
};
I'd like to call 我想打电话
myCollection.Save(a),
such that 这样的
How do I achieve this partial upsert? 我该如何实现部分局部验证?
Many thanks. 非常感谢。
It would be quite easy to do it with 2 successive updates : 连续进行2次更新非常容易:
myCollection.Insert(a,SafeMode.False);
myCollection.Update(Query.EQ("_id",a._id), Update.Set("Foo",a.Foo))
You have to use the SafeMode.False to ensure that if a exists in the collection, the insert won't raise an exception. 您必须使用SafeMode.False来确保如果集合中存在a,则插入不会引发异常。
At first you would think the order of these operations is important but it isn't : if 2 is executed first, whatever its result, 1 will silently fail. 起初,您会认为这些操作的顺序很重要,但并不重要:如果首先执行2,无论其结果如何,1都会无声地失败。
However I don't have clue on how to use the save method to do this direclty. 但是我不知道如何使用save方法执行此操作。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.