How to handle exception in MongoDB?

Question

I am using mongodb database. What the MongoDB will return if there any exception while saving,updating or deleting data(or object)?

Sammaye · Accepted Answer · 2012-12-19 08:08:36Z

3

MongoDB by default (in some drivers) does not enforce a safe mode whereby the database will physically respond to every call you make to say whether or not it was successful.

However in most drivers there is a getLastError() and you can, of course, enforce safe mode on calls using something similar to:

update({},{},{safe:true});

Using both of these methods will allow you to return problems MongoDB might get in handling your operations.

answered Dec 19, 2012 at 8:08

Sammaye

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2 Comments

Sushant Gupta Over a year ago

Its better to have safe set to true while making Connection itself, instead of passing in every write query.

Sammaye Over a year ago

Presuming the driver supports that, the PHP driver didn't support that pre-1.3, since we have no idea what driver he is using we cannot make assumptions about that functionality being there

Sushant Gupta · Accepted Answer · 2012-12-19 08:20:49Z

2

While making a connection to mongod, set safe to true, for instance here is how it can be done using python driver (pymongo)

from pymongo import Connection
connection = Connection('localhost', 27017, safe = True)

By doing so you will get write acknowledgements, else it would be simple fire and forget.

edited Dec 19, 2012 at 8:20

answered Dec 19, 2012 at 8:14

Sushant Gupta

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