mongoc_collection_update_many (mongoc_collection_t *collection,
                               const bson_t *selector,
                               const bson_t *update,
                               const bson_t *opts,
                               bson_t *reply,
                               bson_error_t *error);


  • collection: A mongoc_collection_t.

  • selector: A bson_t containing the query to match documents for updating.

  • update: A bson_t containing the update to perform. If updating with a pipeline, a bson_t array.

  • reply: Optional. An uninitialized bson_t populated with the update result, or NULL.

  • error: An optional location for a bson_error_t or NULL.

opts may be NULL or a BSON document with additional command options:


This function updates all documents in collection that match selector.

To update at most one document see mongoc_collection_update_one().

If you pass a non-NULL reply, it is filled out with fields matchedCount, modifiedCount, and optionally upsertedId if applicable. If there is a server error then reply contains either a “writeErrors” array with one subdocument or a “writeConcernErrors” array. The reply must be freed with bson_destroy().


Errors are propagated via the error parameter.


Returns true if successful. Returns false and sets error if there are invalid arguments or a server or network error.

A write concern timeout or write concern error is considered a failure.

See also

MongoDB update command documentation for more information on the update options.