Feature Checklist for Mongo Drivers

Functionality Checklist

This section lists tasks the driver author might handle.

Essential

• BSON serialization/deserialization
• Basic operations: query, insert, update, remove, ensureIndex, findOne, limit, sort
• Fetch more data from a cursor when necessary (dbGetMore)
• Sending of KillCursors operation when use of a cursor has completed (ideally for efficiently these are sent in batches)
• Convert all strings to utf8
• Authentication

Recommended

• automatic _id generation
• Database $cmd support and helpers
• Detect { $err: ... } response from a db query and handle appropriately --see Error Handling in Mongo Drivers
• [Automatically connect to proper server, and failover], when connecting to a Replica Set
• ensureIndex commands should be cached to prevent excessive communication with the database. (Or, the driver user should be informed that ensureIndex is not a lightweight operation for the particular driver.)
• Support detecting max BSON size on connection (e.g., using buildinfo or isMaster commands) and allowing users to insert docs up to that size.

More Recommended

• lasterror helper functions
• count() helper function
• $where clause
• eval()
• File chunking (GridFS)
• hint fields
• explain helper

More Optional

• addUser, logout helpers
• Allow client user to specify Option_SlaveOk for a query
• Tailable cursor support
• In/out buffer pooling (if implementing in a garbage collected languages)

More Optional

• [connection pooling]
• Automatic reconnect on connection failure
• DBRef Support:
  • Ability to generate easily
  • Automatic traversal

See Also

• The Driver and Integration Center for information about the latest drivers
• The [top page] for this section
• The main Database Internals page
• The starting point for all Home