why c++ driver insert function has no feedback?

[li ning]

When insert a doc which the _id already exist in db, how should I know it? In the shell there is a error output said duplicate key. What about c++ driver's insert? 

and the insert function has thrid parameter: int flag=0. What is this used for? The api reference is very simple, I can not find any description more, sorry

[Xinjun Li]

The MongoDB INSERT message has no response at all, you can check the wire protocol here http://docs.mongodb.org/meta-driver/latest/legacy/mongodb-wire-protocol/.

If you want to check whether there's a  error occurred, you need to call get_last_error. 

You can check the source codes of each driver to see how it encapsulated in that driver. 

On Mon, May 20, 2013 at 11:45 PM, li ning <li.ni...@gmail.com> wrote:

When insert a doc which the _id already exist in db, how should I know it? In the shell there is a error output said duplicate key. What about c++ driver's insert? 

and the insert function has thrid parameter: int flag=0. What is this used for? The api reference is very simple, I can not find any description more, sorry

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[Felipe Albrecht]

Is it not a design flaw?

Because to check if the insertion had error will be necessary another network request to mongodb...

2013/5/22 Xinjun Li <ro...@appannie.com>