mongoc_database_read_command_with_opts (mongoc_database_t *database,
                                        const bson_t *command,
                                        const mongoc_read_prefs_t *read_prefs,
                                        const bson_t *opts,
                                        bson_t *reply,
                                        bson_error_t *error);

Execute a command on the server, applying logic that is specific to commands that read, and taking the MongoDB server version into account. To send a raw command to the server without any of this logic, use mongoc_database_command_simple().

Use this function for commands that read such as “count” or “distinct”. Read concern is applied from opts or else from database. Collation is applied from opts (see example for the “distinct” command with opts). Read preferences are applied from read_prefs or else from database. No write concern is applied.

reply is always initialized, and must be freed with bson_destroy().


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

Consult the MongoDB Manual entry on Database Commands for each command’s arguments.


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.


See the example code for mongoc_client_read_command_with_opts().