Java driver

[mongobee]

import com.mongo.BasicDBObject;

import com.mongodb.DBObject;

 

I think both BasicDBObject and DBObject classes are used to create handle for document object. What is the difference?

 

[Rob Moore]

DBObject is the interface and BasicDBObject the implementation.

http://api.mongodb.org/java/2.9.1/com/mongodb/DBObject.html
http://api.mongodb.org/java/2.9.1/com/mongodb/BasicDBObject.html

In theory you could create a class that implemented the interface and then use it with the driver. 

Rob.

http://www.allanbank.com/mongodb-async-driver/

[Wes Freeman]

I've often wondered why they broke that out. DBObject is an interface, where BasicDBObject implements the interface. Maybe they had intentions to create a different kind of DBObject that wasn't LinkedHashMap based.

Wes

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[mongobee]

thanks Rob and Wes.

 

Another basic question - is there any samples out there that explains how logic implemented in stored procedures (SQL based) are coded in mongodb?

what is equivalent of SQL views?

[Rob Moore]

There are a number of ways to run "logic" on the MongoDB server:

JavaScript "$where" clauses:
    http://www.mongodb.org/display/DOCS/Advanced+Queries#AdvancedQueries-JavascriptExpressionsand{{%24where}}
Map/Reduce:
    http://www.mongodb.org/display/DOCS/MapReduce
Aggregation Pipelines:
    http://docs.mongodb.org/manual/reference/method/db.collection.aggregate/

The Map/Reduce and $where has the ability to use functions defined on the server which is sort of like a stored procedure.
    http://www.mongodb.org/display/DOCS/Server-side+Code+Execution

The Aggregation "$project" operator is probably the closest thing to a SQL view:
    http://docs.mongodb.org/manual/reference/aggregation/project/

Hope this helps or at least gets you started...

Rob.

[mongobee]

This is great. thanks Rob.