module MongoMetaOp: sig
.. end
Meta-Query Operators. see http://docs.mongodb.org/manual/reference/operator/ for more information
: string -> Bson.t -> Bson.t
comment s q
attach a comment s
to a query q
val maxScan : int -> Bson.t -> Bson.t
maxScan i q
constrains the query q
to only scan the specified number of documents i
when fulfilling the query
Note: Contrary to what the official documentation say, it doesn't limit the number of documents a cursor will return for a query but limit the number of document the query will scan
val max : Bson.t -> Bson.t -> Bson.t
max is q
specify the exclusive upper bound for a specific index is
in order to constrain the results of a query q
val min : Bson.t -> Bson.t -> Bson.t
min is q
specify the inclusive lower bound for a specific index is
in order to constrain the results of a query q
val orderBy : Bson.t -> Bson.t -> Bson.t
orderBy fs q
sorts the results of a query q
by specifics fields fs
val explain : Bson.t -> Bson.t
explain q
provides information on the query q
plan
val hint : Bson.t -> Bson.t -> Bson.t
hint is q
forces the query optimizer to use a specific index is
to fulfill the query q
val returnKey : Bson.t -> Bson.t
returnKey q
only return the index field or fields for the results of the query q
val showDiskLoc : Bson.t -> Bson.t
showDiskLoc q
adds a field $diskLoc to the returned documents. The $diskLoc field contains the disk location information
val snapshot : Bson.t -> Bson.t
snapshot q
prevents the cursor from returning a document more than once because an intervening write operation results in a move of the document