bool mongoc_collection_read_command_with_opts (mongoc_collection_t *collection, 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_collection_command_simple().
Use this function for commands that read such as “count” or “distinct”.
Read preferences, read concern, and collation can be overridden by various sources. In a transaction, read concern and write concern are prohibited in
opts and the read preference must be primary or NULL. The highest-priority sources for these options are listed first in the following table. No write concern is applied.
reply is always initialized, and must be freed with
This function is considered a retryable read operation.
Upon a transient error (a network error, errors due to replica set failover, etc.) the operation is safely retried once.
retryreads is false in the URI (see mongoc_uri_t) the retry behavior does not apply.
Retry logic occurs regardless of the underlying command. Retrying
mapReduce has the potential for degraded performance.
getMore command has the potential to miss results. For those commands, use generic command helpers (like mongoc_collection_command_with_opts()) instead.
collection: A mongoc_collection_t.
bson_tcontaining the command specification.
read_prefs: An optional mongoc_read_prefs_t.
bson_tcontaining additional options.
reply: A location for the resulting document.
error: An optional location for a bson_error_t or
opts may be NULL or a BSON document with additional command options:
readConcern: Construct a mongoc_read_concern_t and use mongoc_read_concern_append() to add the read concern to
opts. See the example code for mongoc_client_read_command_with_opts(). Read concern requires MongoDB 3.2 or later, otherwise an error is returned.
sessionId: First, construct a mongoc_client_session_t with mongoc_client_start_session(). You can begin a transaction with mongoc_client_session_start_transaction(), optionally with a mongoc_transaction_opt_t that overrides the options inherited from
collection, and use mongoc_client_session_append() to add the session to
opts. See the example code for mongoc_client_session_t.
Consult the MongoDB Manual entry on Database Commands for each command’s arguments.
Errors are propagated via the
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().