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BSON Helper Functions

This is a non-exhaustive list of helper functions for use in the C++ stream syntax. An exhaustive list is here: bsonmisc.h

Typical example of stream syntax:

BSONObj p = BSON( "name" << "Joe" << "age" << 33 );

GENOID

The server will add an _id automatically if it is not included explicitly.

BSONObj p = BSON( GENOID << "name" << "Joe" << "age" << 33 );
// result is: { _id : ..., name : "Joe", age : 33 }

LT, GT, LTE, GTE, NE

less than, greater than, etc.

BSONObj p = BSON( "age" << GT << 21 );
// result is:  { age : { $gt : 21 } }

DATENOW

Translates to current date

BSONObj p = BSON( "created" << DATENOW );
// result is: { created : "2009-10-09 11:41:42" }

MINKEY, MAXKEY

BSONObj p = BSON( "a" << MINKEY);
// result is: { "a" : { "$minKey" : 1 } }

OR

OR(BSON("x" << GT << 7), BSON("y" << LT << 6))
// result is: {$or: [{x: {$gt: 7}}, {y: {$lt: 6}}]}

BSONNULL

Translates to null value (will appear in MongoDB 2.1)

BSONObj p = BSON( "name" << "Methuselah" << "age" << BSONNULL );
// result is: { name : "Methuselah", age : null }
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